Accounting Policies and Supplemental Disclosures (Tables)

3 Months Ended

Mar. 31, 2021

Accounting Policies [Abstract]

Supplemental Cash Flow Information

The following table shows supplemental cash flow information (in millions):

	Three Months Ended March 31,				Twelve Months Ended March 31,
	2020		2021		2020		2021
SUPPLEMENTAL CASH FLOW INFORMATION:
Cash paid for interest on debt	$	290	$	276	$	879	$	902
Cash paid for operating leases	1,029		1,640		3,680		5,086
Cash paid for interest on finance leases	168		157		650		601
Cash paid for interest on financing obligations	22		33		59		113
Cash paid for income taxes, net of refunds	305		801		1,017		2,209
Assets acquired under operating leases	2,408		3,536		9,403		17,345
Property and equipment acquired under finance leases	2,166		2,067		13,262		11,489
Property and equipment acquired under build-to-suit arrangements	379		887		1,304		2,775

Calculation of Diluted Shares

The following table shows the calculation of diluted shares (in millions):

	Three Months Ended March 31,
	2020	2021
Shares used in computation of basic earnings per share	498	504
Total dilutive effect of outstanding stock awards	8	9
Shares used in computation of diluted earnings per share	506	513

Other Income (Expense), Net

Other income (expense), net, is as follows (in millions):

	Three Months Ended March 31,
	2020		2021
Marketable equity securities valuation gains (losses)	$	(31)	$	(76)
Equity warrant valuation gains (losses)	(152)		305
Upward adjustments relating to equity investments in private companies	—		1,475
Foreign currency gains (losses)	(222)		(31)
Other, net	(1)		24
Total other income (expense), net	(406)		1,697