Derivative Financial Instruments - Schedule of Differences Between the Gains (Losses) on the Derivative and the Gains (Losses) on the Hedged Item (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Derivative [Line Items]
Gain (loss) on derivative recognized in OCI, cash flow hedge	$ (183)	$ 9	$ (389)	$ 46
Gain (loss) on derivative recognized in OCI, net investment hedge	395	111	723	222
Other comprehensive income (loss), derivative, before reclassification and tax	212	120	334	268
Gain (loss) on hedges reclassified to income, cash flow hedge	(22)	24	9	70
Other comprehensive income (loss), derivative, gain (loss), reclassification, before tax	(22)	24	9	70
Gain (loss) on hedges reclassified to income, net investment hedge	0	0	$ 0	0
Floating-rate loans
Derivative [Line Items]
Term of debt instrument			4 years
Interest rate contracts
Derivative [Line Items]
Gain (loss) on derivative recognized in OCI, cash flow hedge	(222)	(3)	$ (604)	(9)
Interest rate contracts | Net interest income
Derivative [Line Items]
Gain (loss) on hedges reclassified to income, cash flow hedge	(22)	22	3	62
Foreign exchange contracts
Derivative [Line Items]
Gain (loss) on derivative recognized in OCI, cash flow hedge	39	12	215	55
Gain (loss) on derivative recognized in OCI, net investment hedge	395	111	723	222
Foreign exchange contracts | Net interest income
Derivative [Line Items]
Gain (loss) on hedges reclassified to income, cash flow hedge	0	2	6	8
Foreign exchange contracts | Gains (Losses) related to investment securities, net
Derivative [Line Items]
Gain (loss) on hedges reclassified to income, net investment hedge	$ 0	$ 0	$ 0	$ 0