v3.26.1
FAIR VALUE MEASUREMENT - Valuation Techniques and Inputs for Level 3 Fair Value Measurements (Details)
Jun. 30, 2026
USD ($)
Boe / $
MWh / $
year
MMBTU / $
Dec. 31, 2025
USD ($)
year
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale (AFS) debt securities $ 286,765,000,000 $ 246,720,000,000
Marketable equity securities 538,000,000 921,000,000
Derivative assets 66,046,000,000 55,434,000,000
Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale (AFS) debt securities 55,756,000,000 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 342,000,000  
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 | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 152,000,000 254,000,000
Price-based | Level 3 | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 736,000,000 985,000,000
Price-based | Level 3 | Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Available-for-sale (AFS) debt securities 333,000,000  
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 594,000,000  
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 899,000,000  
Short-term borrowings and long-term debt 24,417,000,000 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 4,898,000,000 3,608,000,000
Model-based | Level 3 | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1,113,000,000 1,217,000,000
Model-based | Level 3 | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 5,680,000,000 6,597,000,000
Model-based | Level 3 | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   1,881,000,000
Model-based | Level 3 | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1,128,000,000 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 346,000,000  
Model-based | Level 3 | Power forward (/ MWH) | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 2,592,000,000  
Comparable analysis | Level 3 | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 66,000,000 96,000,000
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 788,000,000 $ 676,000,000
Cash flow | 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 $ 166,000,000  
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 0.0491  
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 | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 1.71 4.57
Minimum | Price-based | Level 3 | Price | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1.47 8.00
Minimum | Price-based | Level 3 | Price | Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.67  
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 0.00  
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   0.0105
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 | IR normal volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.0007 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 0.0007 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 0.0054 0.0049
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 0.0700 0.1200
Minimum | Model-based | Level 3 | Equity volatility | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0055 0.0281
Minimum | Model-based | Level 3 | Interest rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities loaned and sold under agreement to repurchase 0.0230  
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 0.6458  
Minimum | Model-based | Level 3 | Equity forward | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.5119 0.5329
Minimum | Model-based | Level 3 | IR basis | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets (0.0203) (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 0.0274 0.0526
Minimum | Model-based | Level 3 | FX volatility | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0202 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   0.0011
Minimum | Model-based | Level 3 | Equity-FX correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt (0.3400) (0.6000)
Minimum | Model-based | Level 3 | Equity-FX correlation | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets (0.7500) (0.7575)
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 | IR-FX correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt   0.0000
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 (0.3400)
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 | Commodity volatility | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0140 0.0840
Minimum | Model-based | Level 3 | Power forward (/ MWH) | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets | MWh / $ 6.91  
Minimum | Model-based | Level 3 | Natural gas forward (/ MMBTU) | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets | MMBTU / $ 0.60  
Minimum | Model-based | Level 3 | Oil forward (/ BBL) | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets | Boe / $ 51.92  
Minimum | Model-based | Level 3 | Recovery rate | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.2000  
Minimum | Comparable analysis | Level 3 | Revenue multiple | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 1.3  
Minimum | Comparable analysis | Level 3 | Illiquidity discount | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 0.1000  
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 0.0000  
Minimum | Cash flow | Level 3 | Yield | State and municipal, foreign government, corporate and other debt securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.0310  
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 3.21 3.24
Minimum | Cash flow | Level 3 | WAL | State and municipal, foreign government, corporate and other debt securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input | year 3.21  
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
Minimum | Recovery analysis | Level 3 | Recovery rate | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.3110 0.3510
Minimum | Recovery analysis | Level 3 | Discount to price | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.5440  
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 0.2318  
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 | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 347.33 205.01
Maximum | Price-based | Level 3 | Price | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 132.16 119.13
Maximum | Price-based | Level 3 | Price | Mortgage-backed securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 105.20  
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 228.62  
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   0.1490
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 0.059293 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 0.050000  
Maximum | Model-based | Level 3 | IR normal volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.0291 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 0.0291 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 0.0097 0.0086
Maximum | Model-based | Level 3 | Equity volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.9112 0.9267
Maximum | Model-based | Level 3 | Equity volatility | Interest rate contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.8707 0.4892
Maximum | Model-based | Level 3 | Equity volatility | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1.8181 1.8401
Maximum | Model-based | Level 3 | Interest rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities loaned and sold under agreement to repurchase 0.0557  
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 3.7528  
Maximum | Model-based | Level 3 | Equity forward | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 3.7528 3.7346
Maximum | Model-based | Level 3 | IR basis | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0923 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 0.1445 0.1401
Maximum | Model-based | Level 3 | FX volatility | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.5989 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   3.9549
Maximum | Model-based | Level 3 | Equity-FX correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.6000 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 0.7000
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 | IR-FX correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt   0.5664
Maximum | Model-based | Level 3 | Equity-IR correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.5685 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 | Commodity volatility | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 3.9625 3.1656
Maximum | Model-based | Level 3 | Power forward (/ MWH) | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets | MWh / $ 574.27  
Maximum | Model-based | Level 3 | Natural gas forward (/ MMBTU) | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets | MMBTU / $ 17.35  
Maximum | Model-based | Level 3 | Oil forward (/ BBL) | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets | Boe / $ 123.63  
Maximum | Model-based | Level 3 | Recovery rate | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.7500  
Maximum | Comparable analysis | Level 3 | Revenue multiple | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 19.7  
Maximum | Comparable analysis | Level 3 | Illiquidity discount | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 0.2210  
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 | Yield | State and municipal, foreign government, corporate and other debt securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.0950  
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 8.04 8.14
Maximum | Cash flow | Level 3 | WAL | State and municipal, foreign government, corporate and other debt securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input | year 8.04  
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
Maximum | Recovery analysis | Level 3 | Recovery rate | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.6860 0.8520
Maximum | Recovery analysis | Level 3 | Discount to price | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.6250  
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 0.1103  
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 | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 87.90 70.91
Weighted Average | Price-based | Level 3 | Price | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 79.14 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 35.33  
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 92.67  
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   0.0643
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 0.009190 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 0.025379  
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 0.0073 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 0.0067 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 0.0074 0.0074
Weighted Average | Model-based | Level 3 | Equity volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.2304 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 0.2294 0.2643
Weighted Average | Model-based | Level 3 | Equity volatility | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.4644 0.4280
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 0.0390  
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 1.4464  
Weighted Average | Model-based | Level 3 | Equity forward | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1.0894 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 (0.0011) (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 0.4751 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 0.0825 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 0.0958 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   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 0.4617 (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 (0.0965) (0.1361)
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 | IR-FX correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt   0.3632
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 0.3453 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 | Commodity volatility | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.7655 0.4229
Weighted Average | Model-based | Level 3 | Power forward (/ MWH) | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets | MWh / $ 55.25  
Weighted Average | Model-based | Level 3 | Natural gas forward (/ MMBTU) | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets | MMBTU / $ 3.50  
Weighted Average | Model-based | Level 3 | Oil forward (/ BBL) | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets | Boe / $ 75.00  
Weighted Average | Model-based | Level 3 | Recovery rate | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.3793  
Weighted Average | Comparable analysis | Level 3 | Revenue multiple | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 11.07  
Weighted Average | Comparable analysis | Level 3 | Illiquidity discount | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 0.1421  
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 0.0661  
Weighted Average | Cash flow | Level 3 | Yield | State and municipal, foreign government, corporate and other debt securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input 0.0910  
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 | Cash flow | Level 3 | WAL | State and municipal, foreign government, corporate and other debt securities    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Debt securities, measurement input | year 6.82  
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
Weighted Average | Recovery analysis | Level 3 | Recovery rate | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.5262 0.6055
Weighted Average | Recovery analysis | Level 3 | Discount to price | Nonrecurring    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans 0.5587