Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Equity, beginning balance	$ 46,905	$ 40,953	$ 46,058	$ 38,257
Other comprehensive income (loss) before reclassification adjustments, pretax	73	206	39	337
Tax	(62)	(142)	(66)	(192)
Other comprehensive income (loss) before reclassification adjustments, net of taxes	11	64	(27)	145
Reclassification adjustments, pretax	(34)	(27)	(134)	(50)
Tax	6	5	29	7
Reclassification adjustments, net of taxes	(28)	(22)	(105)	(43)
Other comprehensive income (loss), net of taxes	(17)	42	(132)	102
Equity, ending balance	38,742	43,318	38,742	43,318
Derivatives
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Equity, beginning balance	(60)	207	73	144
Other comprehensive income (loss) before reclassification adjustments, pretax	194	403	128	551
Tax	(41)	(85)	(27)	(116)
Other comprehensive income (loss) before reclassification adjustments, net of taxes	153	318	101	435
Reclassification adjustments, pretax	(11)	(171)	(113)	(239)
Tax	3	36	24	50
Reclassification adjustments, net of taxes	(8)	(135)	(89)	(189)
Other comprehensive income (loss), net of taxes	145	183	12	246
Equity, ending balance	85	390	85	390
Employee Benefit Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Equity, beginning balance	(2,458)	(2,711)	(2,408)	(2,743)
Other comprehensive income (loss) before reclassification adjustments, pretax	(6)	168	(53)	169
Tax	1	(35)	3	(37)
Other comprehensive income (loss) before reclassification adjustments, net of taxes	(5)	133	(50)	132
Reclassification adjustments, pretax	(23)	144	(30)	189
Tax	3	(31)	5	(43)
Reclassification adjustments, net of taxes	(20)	113	(25)	146
Other comprehensive income (loss), net of taxes	(25)	246	(75)	278
Equity, ending balance	(2,483)	(2,465)	(2,483)	(2,465)
Foreign Currency Translation Adjustment
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Equity, beginning balance	(2,365)	(1,865)	(2,433)	(1,830)
Other comprehensive income (loss) before reclassification adjustments, pretax	(115)	(365)	(36)	(383)
Tax	(22)	(22)	(42)	(39)
Other comprehensive income (loss) before reclassification adjustments, net of taxes	(137)	(387)	(78)	(422)
Reclassification adjustments, pretax	0	0	9	0
Tax	0	0	0	0
Reclassification adjustments, net of taxes	0	0	9	0
Other comprehensive income (loss), net of taxes	(137)	(387)	(69)	(422)
Equity, ending balance	(2,502)	(2,252)	(2,502)	(2,252)
Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Equity, beginning balance	(4,883)	(4,369)	(4,768)	(4,429)
Equity, ending balance	$ (4,900)	$ (4,327)	$ (4,900)	$ (4,327)