Supplemental Financial Statement Information (Effects on Net Income of Amounts Reclassified from AOCI) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Revenue	$ 38,297	$ 38,944	$ 79,456	$ 75,283
Other income (expense), net	1,894	2,967	1,674	4,505
Benefit (provision) for income taxes	(1,318)	(2,200)	(2,239)	(3,689)
Net income	6,959	9,947	13,795	16,604
Gains (Losses) Reclassified from AOCI to the Consolidated Statements of Income
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Net income	264	145	455	242
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	189	98	403	96
Benefit (provision) for income taxes	(40)	(23)	(85)	(28)
Net income	149	75	318	68
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	(27)	(17)	(32)	(42)
Net income	115	70	137	174
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	140	85	166	213
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	$ 2	$ 2	$ 3	$ 3