Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2023	Jun. 30, 2022	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022	Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (7,067)	$ (9,204)	$ (7,067)	$ (9,204)		$ (7,139)
Other Comprehensive Income (Loss), Net of Tax	(2)	(408)	72	(227)
Derivative instruments	44	137	(20)	469
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(161)	(190)	(161)	(190)	$ (222)	(253)	$ (37)	$ 59
Other Comprehensive Income (Loss), before Reclassifications, before Tax	58	(203)	88	(324)
Other Comprehensive Income (Loss), Tax	39	43	39	67
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	97	(160)	127	(257)
Other Comprehensive Income (Loss), Net of Tax	61	(153)	92	(249)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	(46)	9	(45)	10
Reclassification from AOCI, Current Period, Tax	10	(2)	10	(2)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(36)	7	(35)	8
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(1,936)	(2,033)	(1,936)	(2,033)	(1,833)	(1,934)	(1,519)	(1,355)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(84)	(500)	0	(665)
Other Comprehensive Income (Loss), Tax	(12)	(3)	(10)	10
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(96)	(503)	(10)	(655)
Other Comprehensive Income (Loss), Net of Tax	(103)	(514)	(2)	(678)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(7)	(11)	8	(23)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(4,875)	(7,103)	(4,875)	(7,103)	(4,871)	(4,877)	(7,225)	(7,334)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(5)	3	(3)	5
Other Comprehensive Income (Loss), Net of Tax	(4)	122	2	231
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	2	156	5	313
Reclassification from AOCI, Current Period, Tax	(1)	(37)	0	(87)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1	119	5	226
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(95)	122	(95)	122	$ (139)	$ (75)	$ (15)	$ (347)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(1)	260	(184)	680
Other Comprehensive Income (Loss), Tax	3	(27)	36	(83)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	2	233	(148)	597
Derivative instruments	44	137	(20)	469
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, before Tax	55	(108)	164	(142)
Reclassification from AOCI, Current Period, Tax	(13)	12	(36)	14
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ 42	$ (96)	$ 128	$ (128)