Derivative Instruments and Hedging Activities - Derivative Assets and Liabilities at Fair Value (Details) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Notional or contractual amount	$ 249,275	$ 213,069
Derivative assets, gross amount	4,807	2,690
Derivative liabilities, gross amount	6,175	1,868
Derivative asset, netting adjustments	(1,645)	(542)
Derivative liability, netting adjustments	(1,580)	(544)
Total derivative assets	3,162	2,148
Total derivative liabilities	4,595	1,324
Net valuation allowance on derivative assets and liabilities for non-performance risk	6	11
Derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
Notional or contractual amount	116,424	111,618
Derivative assets, gross amount	589	326
Derivative liabilities, gross amount	1,001	39
Derivatives designated as accounting hedges | Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional or contractual amount	109,216	102,059
Derivative assets, gross amount	9	246
Derivative liabilities, gross amount	687	19
Derivatives designated as accounting hedges | Interest rate contracts | Fair value hedges
Derivatives, Fair Value [Line Items]
Notional or contractual amount	58,616	49,659
Derivative assets, gross amount	8	2
Derivative liabilities, gross amount	136	3
Derivatives designated as accounting hedges | Interest rate contracts | Cash flow hedges
Derivatives, Fair Value [Line Items]
Notional or contractual amount	50,600	52,400
Derivative assets, gross amount	1	244
Derivative liabilities, gross amount	551	16
Derivatives designated as accounting hedges | Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional or contractual amount	7,208	9,559
Derivative assets, gross amount	580	80
Derivative liabilities, gross amount	314	20
Derivatives designated as accounting hedges | Foreign exchange contracts | Fair value hedges
Derivatives, Fair Value [Line Items]
Notional or contractual amount	1,225	1,421
Derivative assets, gross amount	0	13
Derivative liabilities, gross amount	314	0
Derivatives designated as accounting hedges | Foreign exchange contracts | Cash flow hedges
Derivatives, Fair Value [Line Items]
Notional or contractual amount	2,088	4,679
Derivative assets, gross amount	102	24
Derivative liabilities, gross amount	0	20
Derivatives designated as accounting hedges | Foreign exchange contracts | Net investment hedges
Derivatives, Fair Value [Line Items]
Notional or contractual amount	3,895	3,459
Derivative assets, gross amount	478	43
Derivative liabilities, gross amount	0	0
Derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
Notional or contractual amount	132,851	101,451
Derivative assets, gross amount	4,218	2,364
Derivative liabilities, gross amount	5,174	1,829
Derivatives not designated as accounting hedges | Customer accommodation
Derivatives, Fair Value [Line Items]
Notional or contractual amount	128,604	97,524
Derivative assets, gross amount	4,171	2,329
Derivative liabilities, gross amount	5,118	1,797
Derivatives not designated as accounting hedges | Interest rate contracts | Customer accommodation
Derivatives, Fair Value [Line Items]
Notional or contractual amount	88,875	71,724
Derivative assets, gross amount	879	620
Derivative liabilities, gross amount	2,015	194
Derivatives not designated as accounting hedges | Interest rate contracts | Other interest rate exposures
Derivatives, Fair Value [Line Items]
Notional or contractual amount	2,258	1,899
Derivative assets, gross amount	38	33
Derivative liabilities, gross amount	44	25
Derivatives not designated as accounting hedges | Foreign exchange contracts | Customer accommodation
Derivatives, Fair Value [Line Items]
Notional or contractual amount	4,253	3,779
Derivative assets, gross amount	141	40
Derivative liabilities, gross amount	114	42
Derivatives not designated as accounting hedges | Commodity contracts | Customer accommodation
Derivatives, Fair Value [Line Items]
Notional or contractual amount	35,476	22,021
Derivative assets, gross amount	3,151	1,669
Derivative liabilities, gross amount	2,989	1,561
Derivatives not designated as accounting hedges | Other contracts
Derivatives, Fair Value [Line Items]
Notional or contractual amount	1,989	2,028
Derivative assets, gross amount	9	2
Derivative liabilities, gross amount	$ 12	$ 7