Supplemental Financial Statement Information (Effects on Net Income of Amounts Reclassified from AOCI) (Details) - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2020	Mar. 31, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue	$ 41,159	$ 36,339
Other income (expense), net	(220)	1,538
Benefit (provision) for income taxes	(921)	(1,489)
Net income	6,836	6,657
Gains (Losses) Reclassified from AOCI to the Consolidated Statements of Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	191	97
Gains (Losses) Reclassified from AOCI to the Consolidated Statements of Income \| Unrealized gains (losses) on available-for-sale investments
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net	214	(2)
Benefit (provision) for income taxes	(45)	(5)
Net income	169	(7)
Gains (Losses) Reclassified from AOCI to the Consolidated Statements of Income \| Unrealized gains (losses) on cash flow hedges
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Benefit (provision) for income taxes	(5)	(25)
Net income	22	104
Gains (Losses) Reclassified from AOCI to the Consolidated Statements of Income \| Unrealized gains (losses) on cash flow hedges \| Foreign exchange contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue	26	128
Gains (Losses) Reclassified from AOCI to the Consolidated Statements of Income \| Unrealized gains (losses) on cash flow hedges \| Interest rate contracts
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Other income (expense), net	$ 1	$ 1

Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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