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FAIR VALUE MEASUREMENT - Valuation Techniques and Inputs for Level 3 Fair Value Measurements (Details)
Sep. 30, 2024
USD ($)
year
decimal
Dec. 31, 2023
USD ($)
decimal
year
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities available-for-sale (AFS) $ 234,444,000,000 $ 256,936,000,000
Marketable equity securities 855,000,000 766,000,000
Derivative assets 50,942,000,000 57,717,000,000
Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities available-for-sale (AFS) 32,503,000,000 30,139,000,000
Model-based | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities borrowed and purchased under agreements to resell 136,000,000 139,000,000
State and municipal, foreign government, corporate and other debt securities   778,000,000
Marketable equity securities   38,000,000
Loans and leases 244,000,000 111,000,000
Mortgage servicing rights 88,000,000 66,000,000
Interest-bearing deposits 42,000,000 29,000,000
Securities loaned and sold under agreement to repurchase 292,000,000  
Securities sold, not yet purchased and other trading liabilities 33,000,000  
Short-term borrowings and long-term debt 22,305,000,000 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 3,678,000,000 5,237,000,000
Model-based | Level 3 | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1,128,000,000 1,652,000,000
Model-based | Level 3 | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 4,059,000,000 4,239,000,000
Model-based | Level 3 | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1,602,000,000 1,943,000,000
Model-based | Level 3 | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 940,000,000 1,135,000,000
Model-based | Level 3 | State And Municipal, Foreign Government, Corporate And Other Debt Securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities available-for-sale (AFS) 428,000,000  
Price-based | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities   679,000,000
State and municipal, foreign government, corporate and other debt securities   1,582,000,000
Marketable equity securities 250,000,000 259,000,000
Asset-backed securities 151,000,000 475,000,000
Non-marketable equities 222,000,000  
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross) 26,000,000 36,000,000
Loans and leases 103,000,000 316,000,000
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 443,000,000  
Price-based | Level 3 | Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities available-for-sale (AFS) 543,000,000  
Price-based | Level 3 | State And Municipal, Foreign Government, Corporate And Other Debt Securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities available-for-sale (AFS) 1,007,000,000  
Yield analysis | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities   401,000,000
Asset-backed securities 64,000,000 57,000,000
Securities loaned or sold under agreements to repurchase and other trading liabilities   7,000,000
Yield analysis | Level 3 | Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities available-for-sale (AFS) 381,000,000  
Comparables analysis | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 228,000,000 366,000,000
Discount rate | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 56,000,000
Mortgage servicing rights $ 595,000,000 $ 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 0.0010 0.0015
State and municipal, foreign government, corporate and other debt securities   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 | Credit spread | State And Municipal, Foreign Government, Corporate And Other Debt Securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.0035  
Minimum | Model-based | Level 3 | Interest rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities borrowed and purchased under agreements to resell 0.0365 0.0400
Securities loaned and sold under agreement to repurchase 0.0357  
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 (0.0016) 0.0270
Minimum | Model-based | Level 3 | Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities sold, not yet purchased and other trading liabilities 0  
Minimum | Model-based | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage servicing rights   0
Minimum | Model-based | Level 3 | IR normal volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.0040 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 0.0028 (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 0.0040 (0.0007)
Minimum | Model-based | Level 3 | IR basis | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets (0.2426) (0.0145)
Minimum | Model-based | Level 3 | Equity volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 0.3490 0.4161
Interest-bearing deposits 1.0000  
Short-term borrowings and long-term debt 0.6673  
Minimum | Model-based | Level 3 | Equity volatility | Interest rate contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0011  
Minimum | Model-based | Level 3 | Equity volatility | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0011 0.0010
Minimum | Model-based | Level 3 | Equity forward    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 0.0447  
Minimum | Model-based | Level 3 | Equity forward | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.6673 0.5414
Minimum | Model-based | Level 3 | Equity-Equity correlation | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets (0.9000) (0.0649)
Short-term borrowings and long-term debt (0.3800)  
Minimum | Model-based | Level 3 | WAL    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Marketable equity securities | year   2.24
Minimum | Model-based | Level 3 | WAL | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets (0.3622) 2.24
Minimum | Model-based | Level 3 | Recovery (in millions)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Marketable equity securities   7,398,000,000
Derivative assets 8,628,000,000  
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 | FX volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets | year 2.65  
Securities loaned or sold under agreements to repurchase and other trading liabilities, measurement   0.0356
Minimum | Model-based | Level 3 | Forward price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases   0.3348
Interest-bearing deposits   1.0000
Short-term borrowings and long-term debt 0.0011  
Minimum | Model-based | Level 3 | Forward price | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0324 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 0.1377 0.1472
Minimum | Model-based | Level 3 | Recovery rate | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.2000 0.1500
Minimum | Model-based | Level 3 | Upfront points | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0094  
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 | 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 0.0730 (0.4533)
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 | Model-based | Level 3 | Inflation volatility | Interest rate contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0025  
Minimum | Price-based | Level 3 | Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities   1.67
State and municipal, foreign government, corporate and other debt securities   0.01
Marketable equity securities   0
Marketable equity securities 0  
Asset-backed securities   3.50
Asset-backed securities 0.69  
Non-marketable equities 0.55  
Non-marketable equities   0.40
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross) 0.11 0.01
Loans and leases 78.12 98.80
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 41.00  
Derivative assets   37.67
Minimum | Price-based | Level 3 | Price | Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.56  
Minimum | Price-based | Level 3 | Price | State And Municipal, Foreign Government, Corporate And Other Debt Securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0  
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 0.3134 0.0125
Minimum | Yield analysis | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities   0.0463
Asset-backed securities 0.0631 0.0593
Securities loaned or sold under agreements to repurchase and other trading liabilities, measurement   0.0746
Minimum | Yield analysis | Level 3 | Yield | Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.0441  
Minimum | Comparables analysis | Level 3 | Illiquidity discount    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 0.0740 0.0800
Minimum | Comparables analysis | Level 3 | Revenue multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities | decimal 4.30 2.80
Minimum | Comparables analysis | Level 3 | PE ratio    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities | decimal   9.30
Minimum | Comparables analysis | Level 3 | EBITDA multiples    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities | decimal   15.80
Minimum | Discount rate | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage servicing rights (0.0120)  
Minimum | Discount rate | Level 3 | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 0.0925 0.0850
Minimum | Discount rate | Level 3 | WAL    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage servicing rights | year 3.5 1.00
Maximum | Model-based | Level 3 | Credit spread    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities borrowed and purchased under agreements to resell 0.0010 0.0015
State and municipal, foreign government, corporate and other debt securities   0.0550
Maximum | Model-based | Level 3 | Credit spread | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0574 0.1519
Maximum | Model-based | Level 3 | Credit spread | State And Municipal, Foreign Government, Corporate And Other Debt Securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.0550  
Maximum | Model-based | Level 3 | Interest rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities borrowed and purchased under agreements to resell 0.0365 0.0400
Securities loaned and sold under agreement to repurchase 0.0482  
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 0.5168 0.0540
Maximum | Model-based | Level 3 | Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities sold, not yet purchased and other trading liabilities 14,350.67  
Maximum | Model-based | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage servicing rights   0.1200
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 0.0132 0.1205
Maximum | Model-based | Level 3 | IR basis | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.5613 1.4779
Maximum | Model-based | Level 3 | Equity volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 0.4251 0.4540
Interest-bearing deposits 1.0000  
Short-term borrowings and long-term debt 2.6863  
Maximum | Model-based | Level 3 | Equity volatility | Interest rate contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 2.6680  
Maximum | Model-based | Level 3 | Equity volatility | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 2.6680 3.3435
Maximum | Model-based | Level 3 | Equity forward    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 2.2895  
Maximum | Model-based | Level 3 | Equity forward | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 2.6863 2.7354
Maximum | Model-based | Level 3 | Equity-Equity correlation | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.7000 0.9744
Short-term borrowings and long-term debt 0.6000  
Maximum | Model-based | Level 3 | WAL    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Marketable equity securities | year   2.24
Maximum | Model-based | Level 3 | WAL | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.9900 2.24
Maximum | Model-based | Level 3 | Recovery (in millions)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Marketable equity securities   7,398,000,000
Derivative assets 8,628,000,000  
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 | FX volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets | year 2.65  
Securities loaned or sold under agreements to repurchase and other trading liabilities, measurement   0.2813
Maximum | Model-based | Level 3 | Forward price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases   3.4843
Interest-bearing deposits   1.0000
Short-term borrowings and long-term debt 2.6680  
Maximum | Model-based | Level 3 | Forward price | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 2.4900 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 2.5777 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 | Upfront points | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1.1912  
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 | 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 0.9330 0.9302
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 | Model-based | Level 3 | Inflation volatility | Interest rate contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0634  
Maximum | Price-based | Level 3 | Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities   124.63
State and municipal, foreign government, corporate and other debt securities   123.74
Marketable equity securities   12,189.17
Marketable equity securities 14,350.67  
Asset-backed securities   129.00
Asset-backed securities 142.85  
Non-marketable equities 3,190.93  
Non-marketable equities   158.92
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross) 111.48 104.79
Loans and leases 99.56 98.80
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 102.78  
Derivative assets   97.00
Maximum | Price-based | Level 3 | Price | Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 149.50  
Maximum | Price-based | Level 3 | Price | State And Municipal, Foreign Government, Corporate And Other Debt Securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 189.68  
Maximum | Price-based | Level 3 | Upfront points | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1.1270 1.1731
Maximum | Yield analysis | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities   0.1908
Asset-backed securities 0.2744 0.1886
Securities loaned or sold under agreements to repurchase and other trading liabilities, measurement   0.0746
Maximum | Yield analysis | Level 3 | Yield | Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.2193  
Maximum | Comparables analysis | Level 3 | Illiquidity discount    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 0.3300 0.1000
Maximum | Comparables analysis | Level 3 | Revenue multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities | decimal 16.26 13.40
Maximum | Comparables analysis | Level 3 | PE ratio    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities | decimal   16.50
Maximum | Comparables analysis | Level 3 | EBITDA multiples    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities | decimal   15.80
Maximum | Discount rate | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage servicing rights 0.1200  
Maximum | Discount rate | Level 3 | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 0.1750 0.0850
Maximum | Discount rate | Level 3 | WAL    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage servicing rights | year 8.33 8.76
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 0.0010 0.0015
State and municipal, foreign government, corporate and other debt securities   0.0304
Weighted Average | Model-based | Level 3 | Credit spread | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0088 0.014034
Weighted Average | Model-based | Level 3 | Credit spread | State And Municipal, Foreign Government, Corporate And Other Debt Securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.0337  
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 0.0365 0.0400
Securities loaned and sold under agreement to repurchase 0.0361  
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 0.0451 0.0320
Weighted Average | Model-based | Level 3 | Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities sold, not yet purchased and other trading liabilities 22.71  
Weighted Average | Model-based | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage servicing rights   0.0806
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 0.0155 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 0.0232 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 0.0332 0.0711
Weighted Average | Model-based | Level 3 | Equity volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 0.3730 0.4317
Interest-bearing deposits 1.0000  
Short-term borrowings and long-term debt 1.0463  
Weighted Average | Model-based | Level 3 | Equity volatility | Interest rate contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.5833  
Weighted Average | Model-based | Level 3 | Equity volatility | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.5432 0.3835
Weighted Average | Model-based | Level 3 | Equity forward    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 1.0194  
Weighted Average | Model-based | Level 3 | Equity forward | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1.0570 1.0144
Weighted Average | Model-based | Level 3 | Equity-Equity correlation | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets (0.1362) 0.8042
Short-term borrowings and long-term debt 0.2787  
Weighted Average | Model-based | Level 3 | WAL    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Marketable equity securities | year   2.24
Weighted Average | Model-based | Level 3 | WAL | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.7133 2.24
Weighted Average | Model-based | Level 3 | Recovery (in millions)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Marketable equity securities   7,398,000,000
Derivative assets 8,628,000,000  
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 | FX volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets | year 2.65  
Securities loaned or sold under agreements to repurchase and other trading liabilities, measurement   0.1317
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   1.0000
Short-term borrowings and long-term debt 0.6941  
Weighted Average | Model-based | Level 3 | Forward price | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1.1346 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 0.4283 0.3703
Weighted Average | Model-based | Level 3 | Recovery rate | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.3743 0.3656
Weighted Average | Model-based | Level 3 | Upfront points | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.5528  
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 | 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 0.4825 0.4503
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 | Model-based | Level 3 | Inflation volatility | Interest rate contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0135  
Weighted Average | Price-based | Level 3 | Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities   55.39
State and municipal, foreign government, corporate and other debt securities   79.71
Marketable equity securities   168.09
Marketable equity securities 106.47  
Asset-backed securities   65.87
Asset-backed securities 76.18  
Non-marketable equities 1,756.38  
Non-marketable equities   56.78
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross) 96.42 90.87
Loans and leases 88.76 98.80
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 83.78  
Derivative assets   79.54
Weighted Average | Price-based | Level 3 | Price | Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 33.43  
Weighted Average | Price-based | Level 3 | Price | State And Municipal, Foreign Government, Corporate And Other Debt Securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 94.98  
Weighted Average | Price-based | Level 3 | Upfront points | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.7191 0.5810
Weighted Average | Yield analysis | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities   0.0893
Asset-backed securities 0.0874 0.0857
Securities loaned or sold under agreements to repurchase and other trading liabilities, measurement   0.0746
Weighted Average | Yield analysis | Level 3 | Yield | Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.0769  
Weighted Average | Comparables analysis | Level 3 | Illiquidity discount    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 0.1435 0.0882
Weighted Average | Comparables analysis | Level 3 | Revenue multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities | decimal 11.95 12.28
Weighted Average | Comparables analysis | Level 3 | PE ratio    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities | decimal   11.37
Weighted Average | Comparables analysis | Level 3 | EBITDA multiples    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities | decimal   15.80
Weighted Average | Discount rate | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage servicing rights 0.0600  
Weighted Average | Discount rate | Level 3 | Discount rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 0.1315 0.0850
Weighted Average | Discount rate | Level 3 | WAL    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage servicing rights | year 7.03 1.29