The following information ($ in millions) comes from a recent annual report of Amazon.com, Inc.:

Net sales$10,778

Total assets4,462

End of year balance in cash1,207

Total stockholders' equity475

Gross profit (Sales Cost of Sales)2,573

Net increase in cash for the year11

Operating expenses2,053

Net operating cash flow770

Other income (expense), net(17)

Compute Amazon's total liabilities at the end of the year.