Accumulated Other Comprehensive Loss (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Dec. 31, 2021	Jun. 30, 2021	Dec. 31, 2020
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	$ (9,582)	$ (9,665)	$ (9,582)	$ (9,665)		$ (8,977)
Other Comprehensive Income (Loss), Net of Tax	(378)	11	(605)	1,190
Derivative instruments	22	32	491	148
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(312)	59	(312)	59	$ (190)	59	$ 72	$ 104
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(61)	(10)	(385)	(25)
Other Comprehensive Income (Loss), Tax	(55)	3	12	5
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(116)	(7)	(373)	(20)
Other Comprehensive Income (Loss), Net of Tax	(122)	(13)	(371)	(45)
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	(8)	(8)	2	(33)
Reclassification from AOCI, Current Period, Tax	2	2	0	8
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(6)	(6)	2	(25)
Accumulated Foreign Currency Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(2,436)	(1,275)	(2,436)	(1,275)	(2,033)	(1,355)	(1,118)	(930)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	(369)	(148)	(1,034)	(298)
Other Comprehensive Income (Loss), Tax	(17)	(8)	(7)	(43)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(386)	(156)	(1,041)	(341)
Other Comprehensive Income (Loss), Net of Tax	(403)	(157)	(1,081)	(345)
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	(17)	(1)	(40)	(4)
Accumulated Defined Benefit Plans Adjustment Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	(6,978)	(8,127)	(6,978)	(8,127)	(7,103)	(7,334)	(8,276)	(9,559)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	6	2	11	1,270
Other Comprehensive Income (Loss), Tax	0	0	0	(298)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	6	2	11	972
Other Comprehensive Income (Loss), Net of Tax	125	149	356	1,432
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	155	191	468	583
Reclassification from AOCI, Current Period, Tax	(36)	(44)	(123)	(123)
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	119	147	345	460
Accumulated Net Gain (Loss) from Cash Flow Hedges Attributable to Parent [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Accumulated other comprehensive loss	144	(322)	144	(322)	$ 122	$ (347)	$ (354)	$ (470)
Other Comprehensive Income (Loss), before Reclassifications, before Tax	122	55	802	167
Other Comprehensive Income (Loss), Tax	(31)	(9)	(114)	(10)
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	91	46	688	157
Derivative instruments	22	32	491	148
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	(80)	(16)	(222)	(10)
Reclassification from AOCI, Current Period, Tax	11	2	25	1
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	$ (69)	$ (14)	$ (197)	$ (9)