Shareholders' Equity - Accumulated Other Comprehensive Income by Component (Details) - USD ($) $ in Millions	3 Months Ended						9 Months Ended
	Sep. 30, 2022	Jun. 30, 2022	Mar. 31, 2022	Sep. 30, 2021	Jun. 30, 2021	Mar. 31, 2021	Sep. 30, 2022	Sep. 30, 2021
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	$ 25,767	$ 26,224	$ 27,363	$ 25,167	$ 25,005	$ 26,200	$ 27,363	$ 26,200
Other comprehensive income (loss) before reclassifications							(3,148)	(830)
Amounts reclassified into (out of) accumulated other comprehensive loss							13	(39)
Other comprehensive loss	(581)	(989)	(1,565)	(260)	(4)	(605)	(3,135)	(869)
Ending balance	25,648	25,767	26,224	27,314	25,167	25,005	25,648	27,314
Accumulated Other Comprehensive Income (Loss)
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance	(3,687)	(2,698)	(1,133)	(422)	(418)	187	(1,133)	187
Other comprehensive loss	(581)	(989)	(1,565)	(260)	(4)	(605)
Ending balance	(4,268)	$ (3,687)	(2,698)	(682)	$ (422)	(418)	(4,268)	(682)
Net Unrealized Gains (Losses) on Cash Flow Hedges
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(2)			57	(2)	57
Other comprehensive income (loss) before reclassifications							(344)	35
Amounts reclassified into (out of) accumulated other comprehensive loss							(6)	(51)
Other comprehensive loss							(350)	(16)
Ending balance	(352)			41			(352)	41
Net Unrealized Gains (Losses) on Available-for-Sale Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(48)			848	(48)	848
Other comprehensive income (loss) before reclassifications							(1,957)	(558)
Amounts reclassified into (out of) accumulated other comprehensive loss							0	0
Other comprehensive loss							(1,957)	(558)
Ending balance	(2,005)			290			(2,005)	290
Net Unrealized Gains (Losses) on Hedges of Net Investments in Non-U.S. Subsidiaries
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			68			(204)	68	(204)
Other comprehensive income (loss) before reclassifications							723	222
Amounts reclassified into (out of) accumulated other comprehensive loss							0	0
Other comprehensive loss							723	222
Ending balance	791			18			791	18
Other-Than-Temporary Impairment on Held-to-Maturity Securities
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(2)			(2)	(2)	(2)
Other comprehensive income (loss) before reclassifications							0	0
Amounts reclassified into (out of) accumulated other comprehensive loss							0	0
Other comprehensive loss							0	0
Ending balance	(2)			(2)			(2)	(2)
Net Unrealized Losses on Retirement Plans
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			(130)			(178)	(130)	(178)
Other comprehensive income (loss) before reclassifications							(1)	0
Amounts reclassified into (out of) accumulated other comprehensive loss							19	12
Other comprehensive loss							18	12
Ending balance	(112)			(166)			(112)	(166)
Foreign Currency Translation
AOCI Attributable to Parent, Net of Tax [Roll Forward]
Beginning balance			$ (1,019)			$ (334)	(1,019)	(334)
Other comprehensive income (loss) before reclassifications							(1,569)	(529)
Amounts reclassified into (out of) accumulated other comprehensive loss							0	0
Other comprehensive loss							(1,569)	(529)
Ending balance	$ (2,588)			$ (863)			$ (2,588)	$ (863)