Supplemental Financial Statement Information (Effects on Net Income of Amounts Reclassified from AOCI) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue	$ 46,173	$ 40,499	$ 125,629	$ 115,782
Other income (expense), net	2,146	(549)	3,820	3,956
Benefit (provision) for income taxes	(2,112)	(1,560)	(4,351)	(5,249)
Net income	11,247	7,068	25,042	23,672
Gains (Losses) Reclassified from AOCI to the Consolidated Statements of Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	50	114	505	356
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	93	49	496	145
Benefit (provision) for income taxes	(20)	(10)	(105)	(38)
Net income	73	39	391	107
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	4	(19)	(28)	(61)
Net income	(23)	75	114	249
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	(28)	93	138	306
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	$ 4	$ 4