FAIR VALUE MEASUREMENT - Valuation Techniques and Inputs for Level 3 Fair Value Measurements (Details)	Mar. 31, 2024 USD ($) year	Dec. 31, 2023 USD ($) year
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	$ 802,000,000	$ 766,000,000
Derivative assets	53,597,000,000	57,717,000,000
Model-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities borrowed and purchased under agreements to resell	132,000,000	139,000,000
State and municipal, foreign government, corporate and other debt securities	678,000,000	778,000,000
Marketable equity securities	40,000,000	38,000,000
Loans and leases	752,000,000	111,000,000
Mortgage servicing rights	64,000,000	66,000,000
Interest-bearing deposits	72,000,000	29,000,000
Securities loaned and sold under agreement to repurchase	326,000,000
Short-term borrowings and long-term debt	40,974,000,000	38,794,000,000
Securities loaned or sold under agreements to repurchase		390,000,000
Securities loaned or sold under agreements to repurchase and other trading liabilities		5,000,000
Model-based | Level 3 | Interest rate contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	5,390,000,000	5,237,000,000
Model-based | Level 3 | Foreign exchange contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1,763,000,000	1,652,000,000
Model-based | Level 3 | Equity contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	4,056,000,000	4,239,000,000
Model-based | Level 3 | Commodity and other contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1,890,000,000	1,943,000,000
Model-based | Level 3 | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1,081,000,000	1,135,000,000
Price-based | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	648,000,000	679,000,000
State and municipal, foreign government, corporate and other debt securities	1,500,000,000	1,582,000,000
Marketable equity securities	193,000,000	259,000,000
Asset-backed securities	287,000,000	475,000,000
Non-marketable equities	109,000,000
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross)	31,000,000	36,000,000
Loans and leases	307,000,000	316,000,000
Securities sold, not yet purchased and other trading liabilities	104,000,000
Securities loaned or sold under agreements to repurchase and other trading liabilities		23,000,000
Price-based | Level 3 | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	403,000,000
Yield analysis | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	245,000,000	401,000,000
Asset-backed securities	84,000,000	57,000,000
Securities loaned or sold under agreements to repurchase and other trading liabilities		7,000,000
Comparables analysis | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	308,000,000	366,000,000
Cash flow | Level 3
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	57,000,000	56,000,000
Mortgage servicing rights	$ 605,000,000	$ 595,000,000
Minimum | Model-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities borrowed and purchased under agreements to resell	0.15%	0.15%
State and municipal, foreign government, corporate and other debt securities	0.0035	0.0035
Minimum | Model-based | Level 3 | Credit spread | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0007	0.001143
Minimum | Model-based | Level 3 | Interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities borrowed and purchased under agreements to resell	4.34%	4.00%
Securities loaned and sold under agreement to repurchase	0.0424
Securities loaned and sold under agreements to repurchase		0.0392
Minimum | Model-based | Level 3 | Interest rate | Interest rate contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0299	0.0270
Minimum | Model-based | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights | year		0
Minimum | Model-based | Level 3 | Appraised value (in millions)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	990,000
Minimum | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	2	2.24
Minimum | Model-based | Level 3 | WAL | Equity contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.99	2.24
Minimum | Model-based | Level 3 | Recovery (in millions)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	$ 7,723,000,000	$ 7,398,000,000
Derivative assets	7,723,000,000
Minimum | Model-based | Level 3 | Recovery (in millions) | Equity contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		$ 7,398,000,000
Minimum | Model-based | Level 3 | IR normal volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Short-term borrowings and long-term debt	0.0032	0.0032
Minimum | Model-based | Level 3 | IR normal volatility | Interest rate contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0032	(0.0007)
Minimum | Model-based | Level 3 | IR normal volatility | Foreign exchange contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0039	(0.0007)
Minimum | Model-based | Level 3 | IR basis | Foreign exchange contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	(0.3903)	(0.0145)
Minimum | Model-based | Level 3 | FX volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0003
Loans and leases	0.0003
Securities loaned or sold under agreements to repurchase and other trading liabilities, measurement		0.0356
Minimum | Model-based | Level 3 | FX volatility | Foreign exchange contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0003
Minimum | Model-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases	0	0.4161
Interest-bearing deposits	0.0565
Minimum | Model-based | Level 3 | Equity volatility | Equity contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0	0.0010
Minimum | Model-based | Level 3 | Equity forward
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases	0.6233
Minimum | Model-based | Level 3 | Equity forward | Equity contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.6233	0.5414
Minimum | Model-based | Level 3 | Equity-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases	(0.9500)
Minimum | Model-based | Level 3 | Equity-FX correlation | Equity contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		(0.7900)
Minimum | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases		0.3348
Interest-bearing deposits	1	1.0000
Minimum | Model-based | Level 3 | Forward price | Commodity and other contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.2919	0.3170
Minimum | Model-based | Level 3 | Commodity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases		0.2651
Minimum | Model-based | Level 3 | Commodity volatility | Commodity and other contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0940	0.1472
Minimum | Model-based | Level 3 | Recovery rate | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.2500	0.1500
Minimum | Model-based | Level 3 | Credit correlation | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 25.00
Minimum | Model-based | Level 3 | Commodity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases		(0.4533)
Minimum | Model-based | Level 3 | Commodity correlation | Commodity and other contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		(0.4533)
Minimum | Model-based | Level 3 | Upfront points | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0247
Minimum | Model-based | Level 3 | Equity-Equity correlation | Equity contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	(0.3622)	(0.0649)
Minimum | Model-based | Level 3 | Credit spread volatility | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.2394
Minimum | Price-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	$ 1.11	$ 1.67
State and municipal, foreign government, corporate and other debt securities	0	0.01
Marketable equity securities	0	0
Asset-backed securities	3.50	3.50
Non-marketable equities	0.55	0.40
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross)	0.11	0.01
Loans and leases	74.86	98.80
Securities sold, not yet purchased and other trading liabilities	0
Securities Loaned Or Sold Under Agreements To Repurchase And Other Trading Liabilities, Measurement Input, Value		0
Minimum | Price-based | Level 3 | Price | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		378,000,000
Derivative assets	$ 40.00	37.67
Minimum | Price-based | Level 3 | Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities		$ 50,000,000
Minimum | Price-based | Level 3 | Upfront points | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.0125
Minimum | Yield analysis | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	5.34%	4.63%
Asset-backed securities	5.77%	5.93%
Securities loaned or sold under agreements to repurchase and other trading liabilities, measurement		0.0746
Minimum | Comparables analysis | Level 3 | Illiquidity discount
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	0.0430	0.0800
Minimum | Comparables analysis | Level 3 | Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	4.20	2.80
Minimum | Comparables analysis | Level 3 | PE ratio
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	9.70	9.30
Minimum | Comparables analysis | Level 3 | EBITDA multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	19.20	15.80
Minimum | Cash flow | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	(0.0050)
Minimum | Cash flow | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	3.71	1.00
Minimum | Cash flow | Level 3 | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	0.0925	0.0850
Maximum | Model-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities borrowed and purchased under agreements to resell	0.15%	0.15%
State and municipal, foreign government, corporate and other debt securities	0.0550	0.0550
Maximum | Model-based | Level 3 | Credit spread | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.2000	0.1519
Maximum | Model-based | Level 3 | Interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities borrowed and purchased under agreements to resell	4.34%	4.00%
Securities loaned and sold under agreement to repurchase	0.0530
Securities loaned and sold under agreements to repurchase		0.0527
Maximum | Model-based | Level 3 | Interest rate | Interest rate contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0532	0.0540
Maximum | Model-based | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights | year		0.1200
Maximum | Model-based | Level 3 | Appraised value (in millions)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	20,410,000
Maximum | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	2	2.24
Maximum | Model-based | Level 3 | WAL | Equity contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.99	2.24
Maximum | Model-based | Level 3 | Recovery (in millions)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	$ 7,723,000,000	$ 7,398,000,000
Derivative assets	7,723,000,000
Maximum | Model-based | Level 3 | Recovery (in millions) | Equity contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		$ 7,398,000,000
Maximum | Model-based | Level 3 | IR normal volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Short-term borrowings and long-term debt	0.2000	0.2000
Maximum | Model-based | Level 3 | IR normal volatility | Interest rate contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.2000	0.1500
Maximum | Model-based | Level 3 | IR normal volatility | Foreign exchange contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0127	0.1205
Maximum | Model-based | Level 3 | IR basis | Foreign exchange contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.9615	1.4779
Maximum | Model-based | Level 3 | FX volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.1173
Loans and leases	1.1173
Securities loaned or sold under agreements to repurchase and other trading liabilities, measurement		0.2813
Maximum | Model-based | Level 3 | FX volatility | Foreign exchange contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.1173
Maximum | Model-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases	2.2066	0.4540
Interest-bearing deposits	0.1715
Maximum | Model-based | Level 3 | Equity volatility | Equity contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	2.2066	3.3435
Maximum | Model-based | Level 3 | Equity forward
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases	2.0642
Maximum | Model-based | Level 3 | Equity forward | Equity contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	2.0642	2.7354
Maximum | Model-based | Level 3 | Equity-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases	0.7000
Maximum | Model-based | Level 3 | Equity-FX correlation | Equity contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.7000
Maximum | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases		3.4843
Interest-bearing deposits	1	1.0000
Maximum | Model-based | Level 3 | Forward price | Commodity and other contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	5.6930	4.2551
Maximum | Model-based | Level 3 | Commodity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases		0.6680
Maximum | Model-based | Level 3 | Commodity volatility | Commodity and other contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.2296	1.4999
Maximum | Model-based | Level 3 | Recovery rate | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.4000	0.7500
Maximum | Model-based | Level 3 | Credit correlation | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 75.00
Maximum | Model-based | Level 3 | Commodity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases		0.9302
Maximum | Model-based | Level 3 | Commodity correlation | Commodity and other contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.9302
Maximum | Model-based | Level 3 | Upfront points | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.1516
Maximum | Model-based | Level 3 | Equity-Equity correlation | Equity contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.9925	0.9744
Maximum | Model-based | Level 3 | Credit spread volatility | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		1.1566
Maximum | Price-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	$ 136.06	$ 124.63
State and municipal, foreign government, corporate and other debt securities	101.08	123.74
Marketable equity securities	13,600.22	12,189.17
Asset-backed securities	139.18	129.00
Non-marketable equities	160.42	158.92
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross)	104.19	104.79
Loans and leases	106.43	98.80
Securities sold, not yet purchased and other trading liabilities	8,962
Securities Loaned Or Sold Under Agreements To Repurchase And Other Trading Liabilities, Measurement Input, Value		12,189.17
Maximum | Price-based | Level 3 | Price | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 99.00	$ 97.00
Maximum | Price-based | Level 3 | Upfront points | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		1.1731
Maximum | Yield analysis | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	23.45%	19.08%
Asset-backed securities	10.79%	18.86%
Securities loaned or sold under agreements to repurchase and other trading liabilities, measurement		0.0746
Maximum | Comparables analysis | Level 3 | Illiquidity discount
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	0.1820	0.1000
Maximum | Comparables analysis | Level 3 | Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	19.08	13.40
Maximum | Comparables analysis | Level 3 | PE ratio
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	9.70	16.50
Maximum | Comparables analysis | Level 3 | EBITDA multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	19.20	15.80
Maximum | Cash flow | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	0.1200
Maximum | Cash flow | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	8.64	8.76
Maximum | Cash flow | Level 3 | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	0.0925	0.0850
Weighted Average | Model-based | Level 3 | Credit spread
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities borrowed and purchased under agreements to resell	0.15%	0.15%
State and municipal, foreign government, corporate and other debt securities	0.0242	0.0304
Weighted Average | Model-based | Level 3 | Credit spread | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0204	0.014034
Weighted Average | Model-based | Level 3 | Interest rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Securities borrowed and purchased under agreements to resell	4.34%	4.00%
Securities loaned and sold under agreement to repurchase	0.0433
Securities loaned and sold under agreements to repurchase		0.0396
Weighted Average | Model-based | Level 3 | Interest rate | Interest rate contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0351	0.0320
Weighted Average | Model-based | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights | year		0.0806
Weighted Average | Model-based | Level 3 | Appraised value (in millions)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	15,980,000
Weighted Average | Model-based | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	2	2.24
Weighted Average | Model-based | Level 3 | WAL | Equity contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.99	2.24
Weighted Average | Model-based | Level 3 | Recovery (in millions)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Marketable equity securities	$ 7,723,000,000	$ 7,398,000,000
Derivative assets	7,723,000,000
Weighted Average | Model-based | Level 3 | Recovery (in millions) | Equity contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		$ 7,398,000,000
Weighted Average | Model-based | Level 3 | IR normal volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Short-term borrowings and long-term debt	0.0112	0.0125
Weighted Average | Model-based | Level 3 | IR normal volatility | Interest rate contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0183	0.0144
Weighted Average | Model-based | Level 3 | IR normal volatility | Foreign exchange contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0078	0.0150
Weighted Average | Model-based | Level 3 | IR basis | Foreign exchange contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0414	0.0711
Weighted Average | Model-based | Level 3 | FX volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.0901
Loans and leases	0.0903
Securities loaned or sold under agreements to repurchase and other trading liabilities, measurement		0.1317
Weighted Average | Model-based | Level 3 | FX volatility | Foreign exchange contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.1178
Weighted Average | Model-based | Level 3 | Equity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases	0.1904	0.4317
Interest-bearing deposits	0.0753
Weighted Average | Model-based | Level 3 | Equity volatility | Equity contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.3031	0.3835
Weighted Average | Model-based | Level 3 | Equity forward
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases	1.0692
Weighted Average | Model-based | Level 3 | Equity forward | Equity contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.0657	1.0144
Weighted Average | Model-based | Level 3 | Equity-FX correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases	(0.1544)
Weighted Average | Model-based | Level 3 | Equity-FX correlation | Equity contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		(0.0766)
Weighted Average | Model-based | Level 3 | Forward price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases		1.1547
Interest-bearing deposits	1	1.0000
Weighted Average | Model-based | Level 3 | Forward price | Commodity and other contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	1.9311	1.3465
Weighted Average | Model-based | Level 3 | Commodity volatility
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases		0.3179
Weighted Average | Model-based | Level 3 | Commodity volatility | Commodity and other contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.3121	0.3703
Weighted Average | Model-based | Level 3 | Recovery rate | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.3924	0.3656
Weighted Average | Model-based | Level 3 | Credit correlation | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 52.70
Weighted Average | Model-based | Level 3 | Commodity correlation
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Loans and leases		(0.0728)
Weighted Average | Model-based | Level 3 | Commodity correlation | Commodity and other contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.4503
Weighted Average | Model-based | Level 3 | Upfront points | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.5039
Weighted Average | Model-based | Level 3 | Equity-Equity correlation | Equity contracts (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	0.7073	0.8042
Weighted Average | Model-based | Level 3 | Credit spread volatility | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.4276
Weighted Average | Price-based | Level 3 | Price
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	$ 40.18	$ 55.39
State and municipal, foreign government, corporate and other debt securities	91.08	79.71
Marketable equity securities	536.39	168.09
Asset-backed securities	64.87	65.87
Non-marketable equities	74.12	56.78
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross)	88.92	90.87
Loans and leases	101.81	98.80
Securities sold, not yet purchased and other trading liabilities	83.27
Securities Loaned Or Sold Under Agreements To Repurchase And Other Trading Liabilities, Measurement Input, Value		28.70
Weighted Average | Price-based | Level 3 | Price | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets	$ 84.45	$ 79.54
Weighted Average | Price-based | Level 3 | Upfront points | Credit derivatives (gross)
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Derivative assets		0.5810
Weighted Average | Yield analysis | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage-backed securities	8.99%	8.93%
Asset-backed securities	8.07%	8.57%
Securities loaned or sold under agreements to repurchase and other trading liabilities, measurement		0.0746
Weighted Average | Comparables analysis | Level 3 | Illiquidity discount
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	0.1014	0.0882
Weighted Average | Comparables analysis | Level 3 | Revenue multiple
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	12.51	12.28
Weighted Average | Comparables analysis | Level 3 | PE ratio
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	9.70	11.37
Weighted Average | Comparables analysis | Level 3 | EBITDA multiples
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	19.20	15.80
Weighted Average | Cash flow | Level 3 | Yield
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	0.0587
Weighted Average | Cash flow | Level 3 | WAL
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Mortgage servicing rights	7.49	1.29
Weighted Average | Cash flow | Level 3 | Discount rate
Fair Value Measurement Inputs and Valuation Techniques [Line Items]
Non-marketable equities	0.0925	0.0850