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• How much was the deferred revenue balance as of Sep 29, 2018?
• How much was the deferred revenue balance as of Sep 28, 2019?
• What is deferred revenue?

Apple Inc. CONSOLIDATED BALANCE SHEETS (In millions, except number of shares which are reflected in thousands and par value) September 28, September 29, 2019 2018 ASSETS: Current assets: Cash and cash equivalents $ 48,844 $ 25,913 Marketable securities 51,713 40,388 Accounts receivable, net 22,926 23,186 Inventories 4,106 3,956 Vendor non-trade receivables 22,878 25,809 Other current assets 12,352 12,087 Total current assets 162,819 131,339 Non-current assets: Marketable securities 105,341 170,799 Property, plant and equipment, net 37,378 41,304 Other non-current assets 32,978 22,283 Total non-current assets 175,697 234,386 Total assets $ 338,516 $ 365,725 LIABILITIES AND SHAREHOLDERS' EQUITY: Current liabilities: Accounts payable $ 46,236 $ 55,888 Other current liabilities 37,720 33,327 Deferred revenue 5,522 5,966 Commercial paper 5,980 11 ,964 Term debt 10,260 8,784 Total current liabilities 105,718 W Non-current liabilities: Term debt 91,807 93,735 Other non-current liabilities 50,503 48,914 Total non-current liabilities T310 T649 Total liabilities 248,028 258,578 Commitments and contingencies Shareholders' equity: Common stock and additional paid-in capital, $000001 par value: 12,600,000 shares authorized; 4,443,236 and 4,754,986 shares issued and outstanding, respectively 45,174 40,201 Retained earnings 45,898 70,400 Accumulated other comprehensive income/(loss) (584) (3,454) Total shareholders' equity 90,488 TAM Total liabilities and shareholders' equity $ 338,516 $ 365,725 Warranty Costs The Company offers limited warranties on its new hardware products and on parts used to repair its hardware products, and customers may purchase extended service coverage, where available, on many of the Company's hardware products. The Company accrues the estimated cost of warranties in the period the related revenue is recognized based on historical and projected warranty claim rates, historical and projected cost per claim and knowledge of specific product failures outside the Company's typical experience. The Company regularly reviews these estimates and adjusts the amounts as necessary. If actual product failure rates or repair costs differ from estimates, revisions to the estimated warranty liabilities would be required. Accrued Warranty and Guarantees The following table shows changes in the Company's accrued warranties and related costs for 2019, 2018 and 2017 (in millions): 2019 2018 2017 Beginning accrued warranty and related costs $ 3,692 $ 3,834 $ 3,702 Cost of warranty claims (3,857) (4,1 15) (4,322) Accruals for product warranty 3,735 3,973 4,454 Ending accrued warranty and related costs W W W The Company offers an iPhone Upgrade Program, which is available to customers who purchase a qualifying iPhone in the US, the UK. and mainland China. The iPhone Upgrade Program provides customers the right to trade in that iPhone for a specified amount when purchasing a new iPhone, provided certain conditions are met. The Company accounts for the trade-in right as a guarantee liability and recognizes arrangement revenue net of the fair value of such right, with subsequent changes to the guarantee liability recognized within net sales