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FAIR VALUE MEASUREMENT - Valuation Techniques and Inputs for Level 3 Fair Value Measurements (Details)
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
year
Fair Value Inputs Assets Liabilities Quantitative Information    
Marketable equity securities $ 766,000,000 $ 895,000,000
Derivatives 57,717,000,000 75,306,000,000
Model-based | Level 3    
Fair Value Inputs Assets Liabilities Quantitative Information    
Securities borrowed and purchased under agreements to resell 139,000,000 146,000,000
State and municipal, foreign government, corporate and other debt securities 778,000,000  
Marketable equity securities 38,000,000 31,000,000
Loans and leases 111,000,000 1,059,000,000
Mortgage servicing rights 66,000,000 84,000,000
Interest-bearing deposits 29,000,000 15,000,000
Securities loaned and sold under agreements to repurchase 390,000,000 970,000,000
Securities sold, not yet purchased and other trading liabilities 5,000,000 6,000,000
Short-term borrowings and long-term debt 38,794,000,000 36,155,000,000
Model-based | Level 3 | Interest rate contracts    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives 5,237,000,000 7,108,000,000
Model-based | Level 3 | Foreign exchange risks    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives 1,652,000,000 1,437,000,000
Model-based | Level 3 | Equity contracts    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives 4,239,000,000 4,430,000,000
Model-based | Level 3 | Commodity contracts    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives 1,943,000,000 2,724,000,000
Model-based | Level 3 | Credit derivatives    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives $ 1,135,000,000 $ 1,520,000,000
Model-based | Credit spread | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Securities borrowed and purchased under agreements to resell, measurement input 0.15% 0.15%
State and municipal, foreign government, corporate and other debt securities, measurement input 0.0035  
Model-based | Credit spread | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Securities borrowed and purchased under agreements to resell, measurement input 0.15% 0.15%
State and municipal, foreign government, corporate and other debt securities, measurement input 0.0550  
Model-based | Credit spread | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Securities borrowed and purchased under agreements to resell, measurement input 0.15% 0.15%
State and municipal, foreign government, corporate and other debt securities, measurement input 0.0304  
Model-based | Credit spread | Level 3 | Foreign exchange risks | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   0.0116
Model-based | Credit spread | Level 3 | Foreign exchange risks | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   0.0626
Model-based | Credit spread | Level 3 | Foreign exchange risks | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   0.0594
Model-based | Credit spread | Level 3 | Credit derivatives | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.001143 0.000250
Model-based | Credit spread | Level 3 | Credit derivatives | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.1519 0.095510
Model-based | Credit spread | Level 3 | Credit derivatives | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.014034 0.010127
Model-based | Interest rate | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Securities borrowed and purchased under agreements to resell, measurement input 4.00% 2.61%
Securities loaned and sold under agreements to repurchase, measurement input 0.0392 0.0401
Model-based | Interest rate | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Securities borrowed and purchased under agreements to resell, measurement input 4.00% 2.61%
Securities loaned and sold under agreements to repurchase, measurement input 0.0527 0.0497
Model-based | Interest rate | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Securities borrowed and purchased under agreements to resell, measurement input 4.00% 2.61%
Securities loaned and sold under agreements to repurchase, measurement input 0.0396 0.0407
Model-based | Interest rate | Level 3 | Interest rate contracts | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0270  
Model-based | Interest rate | Level 3 | Interest rate contracts | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0540  
Model-based | Interest rate | Level 3 | Interest rate contracts | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0320  
Model-based | Yield | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage servicing rights, measurement input 0 (0.0040)
Model-based | Yield | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage servicing rights, measurement input 0.1200 0.1320
Model-based | Yield | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage servicing rights, measurement input 0.0806 0.0536
Model-based | WAL | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Marketable equity securities, measurement input 2.24 2.24
Model-based | WAL | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Marketable equity securities, measurement input 2.24 2.24
Model-based | WAL | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Marketable equity securities, measurement input 2.24 2.24
Model-based | WAL | Level 3 | Equity contracts | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 2.24 2.24
Model-based | WAL | Level 3 | Equity contracts | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 2.24 2.24
Model-based | WAL | Level 3 | Equity contracts | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 2.24 2.24
Model-based | Recovery | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Marketable equity securities, measurement input 7,398,000,000  
Marketable equity securities, measurement input value   $ 7,148,000,000
Model-based | Recovery | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Marketable equity securities, measurement input 7,398,000,000  
Marketable equity securities, measurement input value   7,148,000,000
Model-based | Recovery | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Marketable equity securities, measurement input 7,398,000,000  
Marketable equity securities, measurement input value   7,148,000,000
Model-based | Recovery | Level 3 | Equity contracts | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input value $ 7,398,000,000 7,148,000,000
Model-based | Recovery | Level 3 | Equity contracts | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input value 7,398,000,000 7,148,000,000
Model-based | Recovery | Level 3 | Equity contracts | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input value $ 7,398,000,000 $ 7,148,000,000
Model-based | IR normal volatility | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest-bearing deposits, measurement input   1.0000
Short-term borrowings and long-term debt, measurement input 0.0032 0.0033
Model-based | IR normal volatility | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest-bearing deposits, measurement input   1.0130
Short-term borrowings and long-term debt, measurement input 0.2000 0.0182
Model-based | IR normal volatility | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest-bearing deposits, measurement input   1.0007
Short-term borrowings and long-term debt, measurement input 0.0125 0.0089
Model-based | IR normal volatility | Level 3 | Interest rate contracts | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input (0.0007) 0.0033
Model-based | IR normal volatility | Level 3 | Interest rate contracts | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.1500 0.0182
Model-based | IR normal volatility | Level 3 | Interest rate contracts | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0144 0.0096
Model-based | IR normal volatility | Level 3 | Foreign exchange risks | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input (0.0007) 0.0033
Model-based | IR normal volatility | Level 3 | Foreign exchange risks | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.1205 0.0147
Model-based | IR normal volatility | Level 3 | Foreign exchange risks | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0150 0.0067
Model-based | IR Basis | Level 3 | Foreign exchange risks | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input (0.0145) (0.0423)
Model-based | IR Basis | Level 3 | Foreign exchange risks | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 1.4779 0.0968
Model-based | IR Basis | Level 3 | Foreign exchange risks | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0711 (0.0003)
Model-based | FX volatility | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Securities sold, not yet purchased and other trading liabilities, measurement input 0.0356 0.0200
Model-based | FX volatility | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Securities sold, not yet purchased and other trading liabilities, measurement input 0.2813 0.4000
Model-based | FX volatility | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Securities sold, not yet purchased and other trading liabilities, measurement input 0.1317 0.1285
Model-based | FX volatility | Level 3 | Foreign exchange risks | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   0.0005
Model-based | FX volatility | Level 3 | Foreign exchange risks | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   3.0072
Model-based | FX volatility | Level 3 | Foreign exchange risks | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   0.3391
Model-based | Equity volatility | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Loans and leases, measurement input 0.4161 0.0005
Model-based | Equity volatility | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Loans and leases, measurement input 0.4540 3.0072
Model-based | Equity volatility | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Loans and leases, measurement input 0.4317 0.4262
Model-based | Equity volatility | Level 3 | Equity contracts | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0010 0.0005
Model-based | Equity volatility | Level 3 | Equity contracts | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 3.3435 3.0072
Model-based | Equity volatility | Level 3 | Equity contracts | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.3835 0.4147
Model-based | Equity forward | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Loans and leases, measurement input   0.6834
Model-based | Equity forward | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Loans and leases, measurement input   2.7161
Model-based | Equity forward | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Loans and leases, measurement input   1.0349
Model-based | Equity forward | Level 3 | Equity contracts | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.5414 0.6834
Model-based | Equity forward | Level 3 | Equity contracts | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 2.7354 2.7161
Model-based | Equity forward | Level 3 | Equity contracts | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 1.0144 1.0350
Model-based | Equity-FX Correlation | Level 3 | Equity contracts | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input (0.7900) (0.9500)
Model-based | Equity-FX Correlation | Level 3 | Equity contracts | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.7000 0.5000
Model-based | Equity-FX Correlation | Level 3 | Equity contracts | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input (0.0766) (0.1633)
Model-based | Equity-Equity Correlation | Level 3 | Equity contracts | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input (0.0649) (0.0398)
Model-based | Equity-Equity Correlation | Level 3 | Equity contracts | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.9744 0.9868
Model-based | Equity-Equity Correlation | Level 3 | Equity contracts | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.8042 0.8563
Model-based | Equity-IR correlation | Level 3 | Equity contracts | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   (0.1883)
Model-based | Equity-IR correlation | Level 3 | Equity contracts | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   0.6000
Model-based | Equity-IR correlation | Level 3 | Equity contracts | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   0.3237
Model-based | Forward price | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Loans and leases, measurement input 0.3348 0.1427
Interest-bearing deposits, measurement input 1.0000  
Model-based | Forward price | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Loans and leases, measurement input 3.4843 3.2485
Interest-bearing deposits, measurement input 1.0000  
Model-based | Forward price | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Loans and leases, measurement input 1.1547 1.0507
Interest-bearing deposits, measurement input 1.0000  
Model-based | Forward price | Level 3 | Commodity contracts | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.3170 0.1427
Model-based | Forward price | Level 3 | Commodity contracts | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 4.2551 3.8550
Model-based | Forward price | Level 3 | Commodity contracts | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 1.3465 1.0608
Model-based | Commodity volatility | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Loans and leases, measurement input 0.2651  
Model-based | Commodity volatility | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Loans and leases, measurement input 0.6680  
Model-based | Commodity volatility | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Loans and leases, measurement input 0.3179  
Model-based | Commodity volatility | Level 3 | Commodity contracts | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.1472 0.1043
Model-based | Commodity volatility | Level 3 | Commodity contracts | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 1.4999 1.5150
Model-based | Commodity volatility | Level 3 | Commodity contracts | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.3703 0.3355
Model-based | Commodity correlation | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Loans and leases, measurement input (0.4533)  
Model-based | Commodity correlation | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Loans and leases, measurement input 0.9302  
Model-based | Commodity correlation | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Loans and leases, measurement input (0.0728)  
Model-based | Commodity correlation | Level 3 | Commodity contracts | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input (0.4533) (0.3200)
Model-based | Commodity correlation | Level 3 | Commodity contracts | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.9302 0.9194
Model-based | Commodity correlation | Level 3 | Commodity contracts | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.4503 0.3670
Model-based | Recovery rate | Level 3 | Credit derivatives | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.1500 0.2500
Model-based | Recovery rate | Level 3 | Credit derivatives | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.7500 0.7500
Model-based | Recovery rate | Level 3 | Credit derivatives | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.3656 0.4227
Model-based | Credit correlation | Level 3 | Credit derivatives | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   0.2500
Model-based | Credit correlation | Level 3 | Credit derivatives | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   0.8000
Model-based | Credit correlation | Level 3 | Credit derivatives | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   0.4238
Model-based | Credit spread volatility | Level 3 | Credit derivatives | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.2394 0.3558
Model-based | Credit spread volatility | Level 3 | Credit derivatives | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 1.1566 0.6479
Model-based | Credit spread volatility | Level 3 | Credit derivatives | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.4276 0.4047
Price-based | Level 3    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage-backed securities $ 679,000,000 $ 228,000,000
State and municipal, foreign government, corporate and other debt securities 1,582,000,000 2,360,000,000
Marketable equity securities 259,000,000 147,000,000
Asset-backed securities 475,000,000 304,000,000
Non-marketable equities 50,000,000 101,000,000
Non-trading derivatives and other financial assets and liabilities measured on a recurring basis (gross) 36,000,000 57,000,000
Loans and leases 316,000,000 304,000,000
Securities sold, not yet purchased and other trading liabilities 23,000,000 47,000,000
Price-based | Level 3 | Credit derivatives    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives 378,000,000 439,000,000
Price-based | Price | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage-backed securities, measurement input value 1.67 1.04
State and municipal, foreign government, corporate and other debt securities, measurement input value 0.01 0.01
Marketable equity securities, measurement input value 0 0
Asset-backed securities, measurement input, value 3.50 10.50
Non-marketable equities, measurement input value 0.40  
Non-trading derivatives and other financial assets and liabilities measured on a recurring basis (gross), measurement input, value $ 0.01 $ 80.16
Loans and leases, measurement input 98.80  
Securities sold, not yet purchased and other trading liabilities, measurement input 0 0
Price-based | Price | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage-backed securities, measurement input value $ 124.63 $ 99.71
State and municipal, foreign government, corporate and other debt securities, measurement input value 123.74 994.68
Marketable equity securities, measurement input value 12,189.17 9,087.76
Asset-backed securities, measurement input, value 129.00 145.00
Non-marketable equities, measurement input value 158.92  
Non-trading derivatives and other financial assets and liabilities measured on a recurring basis (gross), measurement input, value $ 104.79 $ 105.32
Loans and leases, measurement input 98.80  
Securities sold, not yet purchased and other trading liabilities, measurement input 12,189.17 9,087,760,000
Price-based | Price | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage-backed securities, measurement input value $ 55.39 $ 51.51
State and municipal, foreign government, corporate and other debt securities, measurement input value 79.71 245.85
Marketable equity securities, measurement input value 168.09 114.29
Asset-backed securities, measurement input, value 65.87 74.97
Non-marketable equities, measurement input value 56.78  
Non-trading derivatives and other financial assets and liabilities measured on a recurring basis (gross), measurement input, value $ 90.87 $ 92.65
Loans and leases, measurement input 98.80  
Securities sold, not yet purchased and other trading liabilities, measurement input 28.70 41,220,000
Price-based | Price | Level 3 | Credit derivatives | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   31.71
Derivatives, measurement input value $ 37.67  
Price-based | Price | Level 3 | Credit derivatives | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   99.00
Derivatives, measurement input value 97.00  
Price-based | Price | Level 3 | Credit derivatives | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   78.75
Derivatives, measurement input value $ 79.54  
Price-based | Commodity volatility | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Loans and leases, measurement input   0.01
Price-based | Commodity volatility | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Loans and leases, measurement input   100.53
Price-based | Commodity volatility | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Loans and leases, measurement input   84.77
Price-based | Upfront points | Level 3 | Credit derivatives | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0125  
Price-based | Upfront points | Level 3 | Credit derivatives | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 1.1731  
Price-based | Upfront points | Level 3 | Credit derivatives | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.5810  
Price-based | Cost of capital | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input   0.0810
Price-based | Cost of capital | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input   0.1750
Price-based | Cost of capital | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input   0.1044
Cash flow | Level 3    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities $ 56,000,000  
Mortgage servicing rights $ 595,000,000 $ 580,000,000
Cash flow | WAL | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage servicing rights, measurement input 1.00 3.92
Cash flow | WAL | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage servicing rights, measurement input 8.76 9.33
Cash flow | WAL | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage servicing rights, measurement input 1.29 7.71
Cash flow | Discount rate | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 0.0850  
Cash flow | Discount rate | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 0.0850  
Cash flow | Discount rate | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 0.0850  
Comparables analysis | Level 3    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities $ 366,000,000 $ 287,000,000
Comparables analysis | Illiquidity discount | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 0.0800 0.0860
Comparables analysis | Illiquidity discount | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 0.1000 0.1700
Comparables analysis | Illiquidity discount | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 0.0882 0.1016
Comparables analysis | PE ratio | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 9.30 14.00
Comparables analysis | PE ratio | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 16.50 15.70
Comparables analysis | PE ratio | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 11.37 15.16
Comparables analysis | Revenue multiple | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 2.80 3.60
Comparables analysis | Revenue multiple | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 13.40 13.90
Comparables analysis | Revenue multiple | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 12.28 12.40
Comparables analysis | EBITDA multiple | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 15.80  
Comparables analysis | EBITDA multiple | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 15.80  
Comparables analysis | EBITDA multiple | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 15.80  
Yield analysis | Level 3    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage-backed securities $ 401,000,000 $ 732,000,000
Asset-backed securities 57,000,000 $ 308,000,000
Securities sold, not yet purchased and other trading liabilities $ 7,000,000  
Yield analysis | Yield | Level 3 | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage-backed securities, measurement input 4.63% 4.41%
Asset-backed securities, measurement input 5.93% 5.76%
Securities sold, not yet purchased and other trading liabilities, measurement input 0.0746  
Yield analysis | Yield | Level 3 | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage-backed securities, measurement input 19.08% 20.30%
Asset-backed securities, measurement input 18.86% 18.58%
Securities sold, not yet purchased and other trading liabilities, measurement input 0.0746  
Yield analysis | Yield | Level 3 | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage-backed securities, measurement input 8.93% 9.74%
Asset-backed securities, measurement input 8.57% 9.34%
Securities sold, not yet purchased and other trading liabilities, measurement input 0.0746