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Derivative Instruments and Hedging Activities - Gains (Losses) on Accounting Hedges and Fair Value Hedges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Dec. 31, 2021
Investment Securities—AFS
Fair Value Hedges - Hedged Items
Amortized cost basis currently/ carrying amount currently or previously hedged	$ 26,017		$ 26,017		$ 17,902
Basis adjustments included in carrying amount	(1,847)		(1,847)		(591)
Deposits
Fair Value Hedges - Hedged Items
Amortized cost basis currently/ carrying amount currently or previously hedged	4,319		4,319		6,279
Basis adjustments included in carrying amount	(138)		(138)		5
Borrowings
Borrowings
Carrying amount currently or previously hedged	135,864		135,864		122,919
Basis adjustments included in carrying amount—Outstanding hedges	(13,052)		(13,052)		2,324
Basis adjustments included in carrying amount—Terminated hedges	(722)		(722)		$ (743)
Fair Value Hedges \| Interest Income \| Interest rate
Gain (Loss) on Fair Value Hedges Recognized in Interest Expense
Gains (losses) recognized in interest expense	846	$ 107	2,037	$ 607
Fair Value Hedges \| Interest Income \| Investment Securities—AFS
Gain (Loss) on Fair Value Hedges Recognized in Interest Expense
Gains (losses) recognized in interest expense	(836)	(82)	(1,960)	(509)
Fair Value Hedges \| Interest expense \| Interest rate
Gain (Loss) on Fair Value Hedges Recognized in Interest Expense
Gains (losses) recognized in interest expense	(5,379)	(763)	(15,629)	(3,633)
Fair Value Hedges \| Interest expense \| Deposits
Gain (Loss) on Fair Value Hedges Recognized in Interest Expense
Gains (losses) recognized in interest expense	25	15	143	73
Fair Value Hedges \| Interest expense \| Borrowings
Gain (Loss) on Fair Value Hedges Recognized in Interest Expense
Gains (losses) recognized in interest expense	5,372	796	15,499	3,547
Net Investment Hedges \| Foreign exchange
Net investment hedges—Foreign exchange contracts
Recognized in OCI	662	225	1,436	524
Forward points excluded from hedge effectiveness testing—Recognized in Interest income	$ 18	$ (19)	$ (59)	$ (32)