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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		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021	Dec. 31, 2021
Investment Securities—AFS
Fair Value Hedges - Hedged Items
Amortized cost basis currently/ carrying amount currently or previously hedged	$ 13,808		$ 13,808		$ 17,902
Basis adjustments included in carrying amount	(1,010)		(1,010)		(591)
Deposits
Fair Value Hedges - Hedged Items
Amortized cost basis currently/ carrying amount currently or previously hedged	4,361		4,361		6,279
Basis adjustments included in carrying amount	(113)		(113)		5
Borrowings
Borrowings
Carrying amount currently or previously hedged	134,037		134,037		122,919
Basis adjustments included in carrying amount—Outstanding hedges	(7,755)		(7,755)		2,324
Basis adjustments included in carrying amount—Terminated hedges	(729)		(729)		$ (743)
Fair Value Hedges \| Interest Income \| Interest rate contracts
Gain (Loss) on Fair Value Hedges Recognized in Interest Expense
Gains (losses) recognized in interest expense	396	$ (331)	1,191	$ 500
Fair Value Hedges \| Interest Income \| Investment Securities—AFS
Gain (Loss) on Fair Value Hedges Recognized in Interest Expense
Gains (losses) recognized in interest expense	(373)	345	(1,124)	(427)
Fair Value Hedges \| Interest expense \| Interest rate contracts
Gain (Loss) on Fair Value Hedges Recognized in Interest Expense
Gains (losses) recognized in interest expense	(4,017)	1,238	(10,250)	(2,870)
Fair Value Hedges \| Interest expense \| Deposits
Gain (Loss) on Fair Value Hedges Recognized in Interest Expense
Gains (losses) recognized in interest expense	30	22	118	58
Fair Value Hedges \| Interest expense \| Borrowings
Gain (Loss) on Fair Value Hedges Recognized in Interest Expense
Gains (losses) recognized in interest expense	3,972	(1,270)	10,127	2,751
Net Investment Hedges \| Foreign exchange
Net investment hedges—Foreign exchange contracts
Recognized in OCI	635	(106)	774	299
Forward points excluded from hedge effectiveness testing—Recognized in Interest income	$ (36)	$ (14)	$ (77)	$ (13)