v3.26.1
FAIR VALUE MEASUREMENT - Valuation Techniques and Inputs for Level 3 Fair Value Measurements (Details)
Mar. 31, 2026
USD ($)
year
Dec. 31, 2025
USD ($)
year
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale (AFS) debt securities $ 257,822,000,000 $ 246,720,000,000
Marketable equity securities 759,000,000 921,000,000
Derivative assets 67,189,000,000 55,434,000,000
Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale (AFS) debt securities 42,135,000,000 37,732,000,000
Yield analysis | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities   214,000,000
Yield analysis | Level 3 | Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale (AFS) debt securities 349,000,000  
Price-based | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities   352,000,000
State and municipal, foreign government, corporate and other debt securities   866,000,000
Price-based | Level 3 | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1,352,000,000 985,000,000
Price-based | Level 3 | Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale (AFS) debt securities 277,000,000  
Price-based | Level 3 | State And Municipal, Foreign Government, Corporate And Other Debt Securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale (AFS) debt securities 1,014,000,000  
Model-based | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
State and municipal, foreign government, corporate and other debt securities   389,000,000
Mortgage servicing rights   82,000,000
Securities loaned and sold under agreement to repurchase 913,000,000  
Short-term borrowings and long-term debt 23,556,000,000 24,126,000,000
Securities loaned or sold under agreements to repurchase and other trading liabilities   952,000,000
Model-based | Level 3 | Interest rate contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 4,314,000,000 3,608,000,000
Model-based | Level 3 | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1,272,000,000 1,217,000,000
Model-based | Level 3 | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 5,800,000,000 6,597,000,000
Model-based | Level 3 | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 2,509,000,000 1,881,000,000
Model-based | Level 3 | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 840,000,000 1,720,000,000
Model-based | Level 3 | State And Municipal, Foreign Government, Corporate And Other Debt Securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale (AFS) debt securities 555,000,000  
Cash flow | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
State and municipal, foreign government, corporate and other debt securities   159,000,000
Mortgage servicing rights $ 764,000,000 $ 676,000,000
Minimum | Yield analysis | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities   0.0478
Minimum | Yield analysis | Level 3 | Yield | Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.0453  
Minimum | Price-based | Level 3 | Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities   0.80
State and municipal, foreign government, corporate and other debt securities   20.77
Minimum | Price-based | Level 3 | Price | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 8.00 8.00
Minimum | Price-based | Level 3 | Price | Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.95  
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 1.00  
Minimum | Price-based | Level 3 | Upfront points | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   0.0505
Minimum | Model-based | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage servicing rights   (0.0040)
Minimum | Model-based | Level 3 | Yield | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0099 0.0105
Minimum | Model-based | Level 3 | Credit spread    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
State and municipal, foreign government, corporate and other debt securities   0.016700
Minimum | Model-based | Level 3 | Credit spread | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.000100 0.000520
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 0.021650  
Minimum | Model-based | Level 3 | Equity volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.0550 0.0550
Minimum | Model-based | Level 3 | Equity volatility | Interest rate contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   0.1200
Minimum | Model-based | Level 3 | Equity volatility | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0248 0.0281
Minimum | Model-based | Level 3 | IR normal volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities loaned and sold under agreement to repurchase 0.0062  
Short-term borrowings and long-term debt 0.0006 0.0006
Minimum | Model-based | Level 3 | IR normal volatility | Interest rate contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0006 0.0006
Minimum | Model-based | Level 3 | IR normal volatility | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0063 0.0049
Minimum | Model-based | Level 3 | Interest rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities loaned and sold under agreement to repurchase 0.0372  
Securities loaned or sold under agreements to repurchase and other trading liabilities, measurement   0.0347
Minimum | Model-based | Level 3 | Equity forward    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.6707  
Minimum | Model-based | Level 3 | Equity forward | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.4845 0.5329
Minimum | Model-based | Level 3 | IR basis | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets (0.0177) (0.2015)
Minimum | Model-based | Level 3 | Equity-Equity correlation | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets (0.3622) (0.3622)
Minimum | Model-based | Level 3 | FX volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.0229 0.0526
Minimum | Model-based | Level 3 | FX volatility | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0039 0.0032
Minimum | Model-based | Level 3 | Forward price | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0010 0.0011
Minimum | Model-based | Level 3 | Equity-FX correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt   (0.6000)
Minimum | Model-based | Level 3 | Equity-FX correlation | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   (0.7575)
Minimum | Model-based | Level 3 | Measurement Input, Commodity Correlation [Member] | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.1341  
Minimum | Model-based | Level 3 | Recovery rate | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   0.0050
Minimum | Model-based | Level 3 | Equity-IR correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.0000 0.0000
Minimum | Model-based | Level 3 | IR-FX correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt (0.3400) (0.3400)
Minimum | Model-based | Level 3 | IR-IR correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt   0.4000
Minimum | Model-based | Level 3 | IR-IR correlation | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.4000  
Minimum | Model-based | Level 3 | Commodity volatility | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   0.0840
Minimum | Cash flow | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
State and municipal, foreign government, corporate and other debt securities   0.0230
Mortgage servicing rights (0.0030)  
Minimum | Cash flow | Level 3 | WAL    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
State and municipal, foreign government, corporate and other debt securities | year   3.24
Mortgage servicing rights | year 3.24 3.24
Minimum | IR normal volatility | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities loaned or sold under agreements to repurchase and other trading liabilities, measurement   0.0046
Maximum | Yield analysis | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities   0.2614
Maximum | Yield analysis | Level 3 | Yield | Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.2897  
Maximum | Price-based | Level 3 | Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities   145.12
State and municipal, foreign government, corporate and other debt securities   194.45
Maximum | Price-based | Level 3 | Price | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 116.23 119.13
Maximum | Price-based | Level 3 | Price | Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 107.79  
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 205.85  
Maximum | Price-based | Level 3 | Upfront points | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   1.0623
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 | Yield | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.1395 0.1490
Maximum | Model-based | Level 3 | Credit spread    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
State and municipal, foreign government, corporate and other debt securities   0.050830
Maximum | Model-based | Level 3 | Credit spread | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.076002 0.059293
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 0.055000  
Maximum | Model-based | Level 3 | Equity volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.8029 0.9267
Maximum | Model-based | Level 3 | Equity volatility | Interest rate contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   0.4892
Maximum | Model-based | Level 3 | Equity volatility | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1.6309 1.8401
Maximum | Model-based | Level 3 | IR normal volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities loaned and sold under agreement to repurchase 0.0120  
Short-term borrowings and long-term debt 0.0298 0.0298
Maximum | Model-based | Level 3 | IR normal volatility | Interest rate contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0298 0.0298
Maximum | Model-based | Level 3 | IR normal volatility | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0121 0.0086
Maximum | Model-based | Level 3 | Interest rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities loaned and sold under agreement to repurchase 0.0579  
Securities loaned or sold under agreements to repurchase and other trading liabilities, measurement   0.0543
Maximum | Model-based | Level 3 | Equity forward    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 3.6178  
Maximum | Model-based | Level 3 | Equity forward | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 3.7004 3.7346
Maximum | Model-based | Level 3 | IR basis | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0576 0.1117
Maximum | Model-based | Level 3 | Equity-Equity correlation | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.9912 0.9900
Maximum | Model-based | Level 3 | FX volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.1565 0.1401
Maximum | Model-based | Level 3 | FX volatility | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.9149 0.7414
Maximum | Model-based | Level 3 | Forward price | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 3.0655 3.9549
Maximum | Model-based | Level 3 | Equity-FX correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt   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 | Measurement Input, Commodity Correlation [Member] | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 2.7196  
Maximum | Model-based | Level 3 | Recovery rate | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   0.4000
Maximum | Model-based | Level 3 | Equity-IR correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.5633 0.5664
Maximum | Model-based | Level 3 | IR-FX correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.6000 0.6000
Maximum | Model-based | Level 3 | IR-IR correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt   0.4000
Maximum | Model-based | Level 3 | IR-IR correlation | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.4000  
Maximum | Model-based | Level 3 | Commodity volatility | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   3.1656
Maximum | Cash flow | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
State and municipal, foreign government, corporate and other debt securities   0.0930
Mortgage servicing rights 0.1200  
Maximum | Cash flow | Level 3 | WAL    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
State and municipal, foreign government, corporate and other debt securities | year   8.14
Mortgage servicing rights | year 8.09 8.14
Maximum | IR normal volatility | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities loaned or sold under agreements to repurchase and other trading liabilities, measurement   0.0089
Weighted Average | Yield analysis | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities   0.1286
Weighted Average | Yield analysis | Level 3 | Yield | Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.1376  
Weighted Average | Price-based | Level 3 | Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities   37.47
State and municipal, foreign government, corporate and other debt securities   114.31
Weighted Average | Price-based | Level 3 | Price | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 79.84 85.45
Weighted Average | Price-based | Level 3 | Price | Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 44.27  
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 105.13  
Weighted Average | Price-based | Level 3 | Upfront points | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   0.6100
Weighted Average | Model-based | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage servicing rights   0.0635
Weighted Average | Model-based | Level 3 | Yield | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0300 0.0643
Weighted Average | Model-based | Level 3 | Credit spread    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
State and municipal, foreign government, corporate and other debt securities   0.039915
Weighted Average | Model-based | Level 3 | Credit spread | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.015348 0.007428
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 0.040013  
Weighted Average | Model-based | Level 3 | Equity volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.2227 0.2095
Weighted Average | Model-based | Level 3 | Equity volatility | Interest rate contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   0.2643
Weighted Average | Model-based | Level 3 | Equity volatility | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.4329 0.4280
Weighted Average | Model-based | Level 3 | IR normal volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities loaned and sold under agreement to repurchase 0.0103  
Short-term borrowings and long-term debt 0.0083 0.0074
Weighted Average | Model-based | Level 3 | IR normal volatility | Interest rate contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0081 0.0065
Weighted Average | Model-based | Level 3 | IR normal volatility | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0083 0.0074
Weighted Average | Model-based | Level 3 | Interest rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities loaned and sold under agreement to repurchase 0.0427  
Securities loaned or sold under agreements to repurchase and other trading liabilities, measurement   0.0385
Weighted Average | Model-based | Level 3 | Equity forward    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 1.4393  
Weighted Average | Model-based | Level 3 | Equity forward | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1.1086 1.1114
Weighted Average | Model-based | Level 3 | IR basis | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets (0.0006) (0.0005)
Weighted Average | Model-based | Level 3 | Equity-Equity correlation | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.4949 0.5248
Weighted Average | Model-based | Level 3 | FX volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.0975 0.0908
Weighted Average | Model-based | Level 3 | FX volatility | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.1160 0.0791
Weighted Average | Model-based | Level 3 | Forward price | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1.0061 0.9883
Weighted Average | Model-based | Level 3 | Equity-FX correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt   (0.1657)
Weighted Average | Model-based | Level 3 | Equity-FX correlation | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   (0.1361)
Weighted Average | Model-based | Level 3 | Measurement Input, Commodity Correlation [Member] | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.5076  
Weighted Average | Model-based | Level 3 | Recovery rate | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   0.3487
Weighted Average | Model-based | Level 3 | Equity-IR correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.3538 0.3632
Weighted Average | Model-based | Level 3 | IR-FX correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.4643 0.4637
Weighted Average | Model-based | Level 3 | IR-IR correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt   0.4000
Weighted Average | Model-based | Level 3 | IR-IR correlation | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.4000  
Weighted Average | Model-based | Level 3 | Commodity volatility | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   0.4229
Weighted Average | Cash flow | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
State and municipal, foreign government, corporate and other debt securities   0.0872
Mortgage servicing rights 0.0651  
Weighted Average | Cash flow | Level 3 | WAL    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
State and municipal, foreign government, corporate and other debt securities | year   6.80
Mortgage servicing rights | year 6.82 6.80
Weighted Average | IR normal volatility | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities loaned or sold under agreements to repurchase and other trading liabilities, measurement   0.0078