Consolidated Statements of Cash Flows - USD ($) $ in Millions 12 Months Ended Dec. 31, 2020 Dec. 31, 2019 Dec. 31, 2018 Statement of Cash Flows [Abstract] CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, BEGINNING OF PERIOD $ 36, 410 $ 32, 173 $ 21, 856 OPERATING ACTIVITIES : Net income 21, 331 11, 588 10, 073 Adjustments to reconcile net income to net cash from operating activities : Depreciation and amortization of property and equipment and capitalized content 25, 251 21, 789 15, 341 costs, operating lease assets, and other Stock-based compensation 9, 208 6, 864 5, 418 Other operating expense (income), net -71 164 274 Other expense (income), net -2, 582 -249 219 Deferred income taxes -554 796 141 Changes in operating assets and liabilities: Inventories -2, 849 -3, 278 -1, 314 Accounts receivable, net and other -8, 169 -7, 681 -4, 615 Accounts payable 17, 480 8, 193 3, 263 Accrued expenses and other 5, 754 -1, 383 472 Inearned revenue 1, 265 1, 711 1, 151 Net cash provided by (used in) operating activities 66, 064 38, 514 30, 723 INVESTING ACTIVITIES : Purchases of property and equipment -40, 140 -16, 861 -13, 427 Proceeds from property and equipment sales and incentives 5, 096 4, 172 2, 104 Acquisitions, net of cash acquired, and other -2, 325 -2, 461 -2, 186 Sales and maturities of marketable securities 50, 237 22, 681 8, 240 Purchases of marketable securities -72, 479 -31, 812 -7, 100 Net cash provided by (used in) investing activities -59, 611 -24, 281 -12, 369 FINANCING ACTIVITIES : Proceeds from short-term debt, and other 6, 796 1, 402 886 Repayments of short-term debt, and other -6, 177 -1, 518 -813 Proceeds from long-term debt 10, 525 871 182 Repayments of long-term debt -1, 553 -1, 166 -155 Principal repayments of finance leases -10, 642 -9, 628 -7, 449 Principal repayments of financing obligations -53 -27 -337 Net cash provided by (used in) financing activities -1, 104 -10, 066 -7, 686 Foreign currency effect on cash, cash equivalents, and restricted cash 618 70 -351 Net increase (decrease) in cash, cash equivalents, and restricted cash 5, 967 4, 237 10, 317 CASH, CASH EQUIVALENTS, AND RESTRICTED CASH, END OF PERIOD $ 42, 377 $ 36, 410 $ 32, 173Consolidated Statements Of Operations - USD ($) shares in Millions, $ 12 Months Ended in lillions Dec. 31, 2020 Dec. 31, 2019 Dec. 31, 2018 Total net sales $ 386, 064 $ 280, 522 $ 232, 887 Operating expenses : Cost of sales 233, 307 165, 536 139, 156 Fulfillment 58, 517 40, 232 34, 027 Technology and content 42, 740 35, 931 28, 837 Marketing 22, 008 18, 878 13, 814 General and administrative 6, 668 5, 203 4, 336 Other operating expense (income), net -75 201 296 Total operating expenses 363, 165 265, 981 220, 466 Operating income 22, 899 14, 541 12, 421 Interest income 555 832 440 Interest expense -1, 647 -1, 600 -1, 417 Other income (expense) , net 2, 371 203 -183 Total non-operating income (expense) 1, 279 -565 -1, 160 Income before income taxes 24, 178 13, 976 11, 261 Provision for income taxes -2, 863 -2, 374 -1, 197 Equity method investment activity, net of tax 16 -14 9 Net income $ 21, 331 $ 11, 588 $ 10, 073 Basic earnings per share (in dollars per share) $ 42. 64 $ 23. 46 $ 20. 68 Diluted earnings per share (in dollars per share) $ 41. 83 $ 23. 01 $ 20. 14 Weighted average shares used in computation of earnings per share: Basic (in shares) 500 494 487 Diluted (in shares) 510 504 500 Net product sales Total net sales $ 215, 915 $ 160, 408 $ 141, 915 Net service sales Total net sales $ 170, 149 $ 120, 114 $ 90, 972Consolidated Balance Sheets - USD (3) $ in Iillions Dec. 31, 2020 Dec. 31, 2019 Current assets: Cash and cash equivalents $ 42,122 $ 30,092 Marketable securities 42,274 13,929 Inventories 23,795 20,497 Accounts receivable, net and other 24,542 20,310 Total current assets 132,733 90,334 Property and equipment, net 113,114 72,705 Operating leases 37,553 25,141 Goodwill 15,017 14,754 Other assets 22,773 10,314 Total assets 321,195 225,243 Current liabilities: Accounts payable 72,539 47,133 Accrued expenses and other 44,133 32,439 Unearned revenue 9,703 3,190 Total current liabilities 120,335 37,312 Long-term lease liabilities 52,573 39,791 Long-term debt 31,310 23,414 Other long-term liabilities 17,017 12,171 Commitments and contingencies (Note 7) Stockholders' equity: Preferred stock, $0.01 par value: Authorized shares - 500 Issued and 0 0 outstanding shares - none Common stock, $0.01 par value: Authorized shares - 5,000 Issued shares - 521 5 5 and 527 Outstanding shares - 493 and 503 Treasury stock, at cost -1,337 -1,337 Additional paid-in capital 42,305 33,053 Accumulated other comprehensive income {loss} -130 -930 Retained earnings 52,551 31,220 Total stockholders' equity 93,404 02,000 Total liabilities and stockholders' equity $ 321,195 $ 225,243