Financial Instruments (Effect of Derivative Instruments on Income and Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Foreign exchange contracts
Revenues	$ 61,880	$ 38,297	$ 117,194	$ 79,456
Other income (expense), net	2,624	1,894	7,470	1,674
Revenues
Foreign exchange contracts
Total gains (losses)	(7)	151	(116)	200
Other income (expense), net
Foreign exchange contracts
Total gains (losses)	(183)	(246)	(178)	34
Foreign exchange contracts
Foreign exchange contracts
Total	(243)	(214)	346	330
Foreign exchange contracts | Revenues | Fair Value of Derivatives Not Designated as Hedging Instruments
Foreign exchange contracts
Derivatives not designated as hedging instruments	0	0	0	0
Foreign exchange contracts | Other income (expense), net | Fair Value of Derivatives Not Designated as Hedging Instruments
Foreign exchange contracts
Derivatives not designated as hedging instruments	(64)	(69)	(404)	160
Other derivatives | Revenues | Fair Value of Derivatives Not Designated as Hedging Instruments
Foreign exchange contracts
Derivatives not designated as hedging instruments	0	0	0	0
Other derivatives | Other income (expense), net | Fair Value of Derivatives Not Designated as Hedging Instruments
Foreign exchange contracts
Derivatives not designated as hedging instruments	(142)	(211)	181	(239)
Derivatives in Cash Flow Hedging Relationship | Foreign exchange contracts
Foreign exchange contracts
Amount included in the assessment of effectiveness	(60)	(44)	102	368
Amount excluded from the assessment of effectiveness	(4)	(49)	45	3
Derivatives in Cash Flow Hedging Relationship | Foreign exchange contracts | Revenues
Foreign exchange contracts
Amount of gains (losses) reclassified from AOCI to income	(3)	140	(108)	166
Amount excluded from the assessment of effectiveness recognized in earnings based on an amortization approach	(4)	11	(8)	34
Derivatives in Cash Flow Hedging Relationship | Foreign exchange contracts | Other income (expense), net
Foreign exchange contracts
Amount of gains (losses) reclassified from AOCI to income	0	0	0	0
Amount excluded from the assessment of effectiveness recognized in earnings based on an amortization approach	0	0	0	0
Derivatives in Fair Value Hedging Relationship | Foreign exchange contracts | Revenues
Foreign exchange contracts
Hedged items	0	0	0	0
Derivatives designated as hedging instruments	0	0	0	0
Amount excluded from the assessment of effectiveness	0	0	0	0
Derivatives in Fair Value Hedging Relationship | Foreign exchange contracts | Other income (expense), net
Foreign exchange contracts
Hedged items	28	9	28	(8)
Derivatives designated as hedging instruments	(28)	(9)	(28)	8
Amount excluded from the assessment of effectiveness	2	1	4	2
Derivatives in Net Investment Hedging Relationship: | Foreign exchange contracts
Foreign exchange contracts
Amount included in the assessment of effectiveness	(179)	(121)	199	(41)
Derivatives in Net Investment Hedging Relationship: | Foreign exchange contracts | Revenues
Foreign exchange contracts
Amount excluded from the assessment of effectiveness	0	0	0	0
Derivatives in Net Investment Hedging Relationship: | Foreign exchange contracts | Other income (expense), net
Foreign exchange contracts
Amount excluded from the assessment of effectiveness	$ 21	$ 33	$ 41	$ 111