Derivative Instruments and Hedging Activities - Derivative Assets and Liabilities at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Derivatives, Fair Value [Line Items]
Notional or contractual amount	$ 227,801	$ 213,069
Derivative assets, gross amount	3,098	2,690
Derivative liabilities, gross amount	4,550	1,868
Derivative asset, netting adjustments	(1,134)	(542)
Derivative liability, netting adjustments	(1,235)	$ (544)
Derivative Asset, Statement of Financial Position [Extensible Enumeration]		Other assets
Total derivative assets	1,964	$ 2,148
Total derivative liabilities	3,315	1,324
Net valuation allowance on derivative assets and liabilities for non-performance risk	4	11
Derivatives designated as accounting hedges
Derivatives, Fair Value [Line Items]
Notional or contractual amount	98,966	111,618
Derivative assets, gross amount	85	326
Derivative liabilities, gross amount	820	39
Derivatives designated as accounting hedges | Interest rate contracts
Derivatives, Fair Value [Line Items]
Notional or contractual amount	91,306	102,059
Derivative assets, gross amount	3	246
Derivative liabilities, gross amount	504	19
Derivatives designated as accounting hedges | Interest rate contracts | Fair value hedges
Derivatives, Fair Value [Line Items]
Notional or contractual amount	60,956	49,659
Derivative assets, gross amount	3	2
Derivative liabilities, gross amount	53	3
Derivatives designated as accounting hedges | Interest rate contracts | Cash flow hedges
Derivatives, Fair Value [Line Items]
Notional or contractual amount	30,350	52,400
Derivative assets, gross amount	0	244
Derivative liabilities, gross amount	451	16
Derivatives designated as accounting hedges | Foreign exchange contracts
Derivatives, Fair Value [Line Items]
Notional or contractual amount	7,660	9,559
Derivative assets, gross amount	82	80
Derivative liabilities, gross amount	316	20
Derivatives designated as accounting hedges | Foreign exchange contracts | Fair value hedges
Derivatives, Fair Value [Line Items]
Notional or contractual amount	1,338	1,421
Derivative assets, gross amount	0	13
Derivative liabilities, gross amount	211	0
Derivatives designated as accounting hedges | Foreign exchange contracts | Cash flow hedges
Derivatives, Fair Value [Line Items]
Notional or contractual amount	2,175	4,679
Derivative assets, gross amount	4	24
Derivative liabilities, gross amount	14	20
Derivatives designated as accounting hedges | Foreign exchange contracts | Net investment hedges
Derivatives, Fair Value [Line Items]
Notional or contractual amount	4,147	3,459
Derivative assets, gross amount	78	43
Derivative liabilities, gross amount	91	0
Derivatives not designated as accounting hedges
Derivatives, Fair Value [Line Items]
Notional or contractual amount	128,835	101,451
Derivative assets, gross amount	3,013	2,364
Derivative liabilities, gross amount	3,730	1,829
Derivatives not designated as accounting hedges | Customer accommodation
Derivatives, Fair Value [Line Items]
Notional or contractual amount	125,462	97,524
Derivative assets, gross amount	2,970	2,329
Derivative liabilities, gross amount	3,689	1,797
Derivatives not designated as accounting hedges | Interest rate contracts | Customer accommodation
Derivatives, Fair Value [Line Items]
Notional or contractual amount	91,601	71,724
Derivative assets, gross amount	1,140	620
Derivative liabilities, gross amount	1,873	194
Derivatives not designated as accounting hedges | Interest rate contracts | Other interest rate exposures
Derivatives, Fair Value [Line Items]
Notional or contractual amount	1,135	1,899
Derivative assets, gross amount	34	33
Derivative liabilities, gross amount	22	25
Derivatives not designated as accounting hedges | Foreign exchange contracts | Customer accommodation
Derivatives, Fair Value [Line Items]
Notional or contractual amount	4,926	3,779
Derivative assets, gross amount	74	40
Derivative liabilities, gross amount	78	42
Derivatives not designated as accounting hedges | Commodity contracts | Customer accommodation
Derivatives, Fair Value [Line Items]
Notional or contractual amount	28,935	22,021
Derivative assets, gross amount	1,756	1,669
Derivative liabilities, gross amount	1,738	1,561
Derivatives not designated as accounting hedges | Other contracts
Derivatives, Fair Value [Line Items]
Notional or contractual amount	2,238	2,028
Derivative assets, gross amount	9	2
Derivative liabilities, gross amount	$ 19	$ 7