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FAIR VALUE MEASUREMENT - Valuation Techniques and Inputs for Level 3 Fair Value Measurements (Details)
Mar. 31, 2023
USD ($)
year
Dec. 31, 2022
USD ($)
year
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Marketable equity securities $ 887,000,000 $ 895,000,000
Derivative assets 66,079,000,000 75,306,000,000
Model-based | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities borrowed and purchased under agreements to resell 152,000,000 146,000,000
Marketable equity securities 33,000,000 31,000,000
Loans and leases 397,000,000 1,059,000,000
Mortgage servicing rights 82,000,000 84,000,000
Interest-bearing deposits   15,000,000
Securities loaned and sold under agreement to repurchase 804,000,000  
Short-term borrowings and long-term debt 35,492,000,000 36,155,000,000
Securities Loaned or Sold under Agreements to Repurchase, Fair Value Disclosure   970,000,000
Securities Loaned Or Sold Under Agreements To Repurchase And Other Trading Liabilities, Fair Value Disclosure   6,000,000
Model-based | Level 3 | Interest rate contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 6,123,000,000 7,108,000,000
Model-based | Level 3 | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1,544,000,000 1,437,000,000
Model-based | Level 3 | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 4,291,000,000 4,430,000,000
Model-based | Level 3 | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 2,366,000,000 2,724,000,000
Model-based | Level 3 | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1,175,000,000 1,520,000,000
Yield analysis | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities 674,000,000 732,000,000
Asset-backed securities 268,000,000 308,000,000
Price-based | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities 342,000,000 228,000,000
State and municipal, foreign government, corporate and other debt securities 2,832,000,000 2,360,000,000
Marketable equity securities 183,000,000 147,000,000
Asset-backed securities 282,000,000 304,000,000
Non-marketable equities   101,000,000
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross) 72,000,000 57,000,000
Loans and leases 243,000,000 304,000,000
Securities sold, not yet purchased and other trading liabilities 63,000,000  
Securities Loaned Or Sold Under Agreements To Repurchase And Other Trading Liabilities, Fair Value Disclosure   47,000,000
Price-based | Level 3 | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 538,000,000 439,000,000
Comparable analysis | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 273,000,000 287,000,000
Cash flow | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 87,000,000  
Mortgage servicing rights 575,000,000 $ 580,000,000
Forward price | Level 3    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Interest-bearing deposits $ 16,000,000  
Minimum | Model-based | Level 3 | Interest Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities borrowed and purchased under agreements to resell 1.68% 2.61%
Securities loaned and sold under agreement to repurchase 0.0236  
Securities Loaned And Sold Under Agreements To Repurchase, Measurement Input   0.0401
Minimum | Model-based | Level 3 | Credit Spread    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities borrowed and purchased under agreements to resell 0.15% 0.15%
Minimum | Model-based | Level 3 | Credit Spread | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   0.0116
Minimum | Model-based | Level 3 | Credit Spread | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0007 0.000250
Minimum | Model-based | Level 3 | Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 71.00  
Minimum | Model-based | Level 3 | WAL    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Marketable equity securities 2 2.24
Mortgage servicing rights | year 3.83 3.92
Minimum | Model-based | Level 3 | WAL | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   2.24
Minimum | Model-based | Level 3 | Recovery    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Marketable equity securities $ 7,148,000,000  
Marketable equity securities   7,148,000,000
Derivative assets | year 7,148,000,000  
Minimum | Model-based | Level 3 | Recovery | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   $ 7,148,000,000
Minimum | Model-based | Level 3 | IR Normal Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.0030 0.0033
Minimum | Model-based | Level 3 | IR Normal Volatility | Interest rate contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0030 0.0033
Minimum | Model-based | Level 3 | IR Normal Volatility | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   0.0033
Minimum | Model-based | Level 3 | IR Basis | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0031 (0.0423)
Minimum | Model-based | Level 3 | Equity Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases   0.0005
Minimum | Model-based | Level 3 | Equity Volatility | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.3033 0.0005
Minimum | Model-based | Level 3 | Equity Volatility | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0 0.0005
Minimum | Model-based | Level 3 | FX Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities Loaned Or Sold Under Agreements To Repurchase And Other Trading Liabilities, Measurement Input   0.0200
Minimum | Model-based | Level 3 | FX Volatility | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0110  
Minimum | Model-based | Level 3 | Equity Forward | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.7209 0.6834
Minimum | Model-based | Level 3 | Equity - FX Correlation | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 2 (0.9500)
Minimum | Model-based | Level 3 | Equity-IR Correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets (0.2000)  
Minimum | Model-based | Level 3 | Equity-IR Correlation | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   (0.1883)
Minimum | Model-based | Level 3 | Commodity Correlation | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets (0.3000) (0.3200)
Minimum | Model-based | Level 3 | Commodity Volatility | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.1329 0.1043
Minimum | Model-based | Level 3 | Forward Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Interest-bearing deposits   1.0000
Minimum | Model-based | Level 3 | Forward Price | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.1979 0.1427
Minimum | Model-based | Level 3 | Equity - Equity Correlation | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets (0.9500) (0.0398)
Minimum | Yield analysis | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities 4.73% 4.41%
Asset-backed securities 6.00% 5.76%
Minimum | Price-based | Level 3 | Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities $ 0.50 $ 1.04
State and municipal, foreign government, corporate and other debt securities 0.01 0.01
Marketable equity securities 0 0
Asset-backed securities 0 10.50
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross) 0.01 $ 80.16
Loans and leases   0.01
Securities sold, not yet purchased and other trading liabilities $ 0  
Securities Loaned Or Sold Under Agreements To Repurchase And Other Trading Liabilities, Measurement Input   0
Minimum | Price-based | Level 3 | Price | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1.58  
Derivative assets   $ 31.71
Minimum | Price-based | Level 3 | PE Ratio    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities   14.00
Minimum | Price-based | Level 3 | Revenue Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities   3.60
Minimum | Price-based | Level 3 | Equity Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 0  
Minimum | Price-based | Level 3 | Equity Forward    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 0.7209 0.6834
Minimum | Price-based | Level 3 | Commodity Correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases (0.3000)  
Minimum | Price-based | Level 3 | Commodity Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 0.1329  
Minimum | Price-based | Level 3 | Forward Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 0.1979 0.1427
Minimum | Price-based | Level 3 | Recovery Rate | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.1500 0.2500
Minimum | Price-based | Level 3 | Credit Correlation | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.2500 0.2500
Minimum | Price-based | Level 3 | Upfront Points | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets (0.0027)  
Minimum | Price-based | Level 3 | Cost of Capital    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities   0.0810
Minimum | Price-based | Level 3 | Credit Spread Volatility | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   0.3558
Minimum | Comparable analysis | Level 3 | Illiquidity Discount    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 0.0800 0.0860
Minimum | Cash flow | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage servicing rights (0.0040) (0.0040)
Minimum | Cash flow | Level 3 | PE Ratio    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 14.00  
Minimum | Cash flow | Level 3 | Discount to price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 0.0850  
Minimum | Cash flow | Level 3 | Revenue Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 3.50  
Minimum | Forward price | Level 3 | Equity Forward    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Interest-bearing deposits 1.0000  
Maximum | Model-based | Level 3 | Interest Rate    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities borrowed and purchased under agreements to resell 4.90% 2.61%
Securities loaned and sold under agreement to repurchase 0.0490  
Securities Loaned And Sold Under Agreements To Repurchase, Measurement Input   0.0497
Maximum | Model-based | Level 3 | Credit Spread    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities borrowed and purchased under agreements to resell 0.15% 0.15%
Maximum | Model-based | Level 3 | Credit Spread | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   0.0626
Maximum | Model-based | Level 3 | Credit Spread | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0972 0.095510
Maximum | Model-based | Level 3 | Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 100.00  
Maximum | Model-based | Level 3 | WAL    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Marketable equity securities 2 2.24
Mortgage servicing rights | year 9.11 9.33
Maximum | Model-based | Level 3 | WAL | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   2.24
Maximum | Model-based | Level 3 | Recovery    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Marketable equity securities $ 7,148,000,000  
Marketable equity securities   7,148,000,000
Derivative assets | year 7,148,000,000  
Maximum | Model-based | Level 3 | Recovery | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   $ 7,148,000,000
Maximum | Model-based | Level 3 | IR Normal Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.0207 0.0182
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 0.0182
Maximum | Model-based | Level 3 | IR Normal Volatility | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   0.0147
Maximum | Model-based | Level 3 | IR Basis | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0207 0.0968
Maximum | Model-based | Level 3 | Equity Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases   3.0072
Maximum | Model-based | Level 3 | Equity Volatility | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.3499 3.0072
Maximum | Model-based | Level 3 | Equity Volatility | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 3.0207 3.0072
Maximum | Model-based | Level 3 | FX Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities Loaned Or Sold Under Agreements To Repurchase And Other Trading Liabilities, Measurement Input   0.4000
Maximum | Model-based | Level 3 | FX Volatility | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.4450  
Maximum | Model-based | Level 3 | Equity Forward | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 2.5463 2.7161
Maximum | Model-based | Level 3 | Equity - FX Correlation | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 2 0.5000
Maximum | Model-based | Level 3 | Equity-IR Correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.6000  
Maximum | Model-based | Level 3 | Equity-IR Correlation | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   0.6000
Maximum | Model-based | Level 3 | Commodity Correlation | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.9373 0.9194
Maximum | Model-based | Level 3 | Commodity Volatility | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1.0792 1.5150
Maximum | Model-based | Level 3 | Forward Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Interest-bearing deposits   1.0130
Maximum | Model-based | Level 3 | Forward Price | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 6.8312 3.8550
Maximum | Model-based | Level 3 | Equity - Equity Correlation | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.7000 0.9868
Maximum | Yield analysis | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities 21.61% 20.30%
Asset-backed securities 23.00% 18.58%
Maximum | Price-based | Level 3 | Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities $ 129.67 $ 99.71
State and municipal, foreign government, corporate and other debt securities 921.88 994.68
Marketable equity securities 10,165.3 9,087.76
Asset-backed securities 100.00 145.00
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross) 106.00 $ 105.32
Loans and leases   100.53
Securities sold, not yet purchased and other trading liabilities $ 2,720  
Securities Loaned Or Sold Under Agreements To Repurchase And Other Trading Liabilities, Measurement Input   9,087.76
Maximum | Price-based | Level 3 | Price | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 99.26  
Derivative assets   $ 99.00
Maximum | Price-based | Level 3 | PE Ratio    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities   15.70
Maximum | Price-based | Level 3 | Revenue Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities   13.90
Maximum | Price-based | Level 3 | Equity Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 3.0207  
Maximum | Price-based | Level 3 | Equity Forward    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 2.5463 2.7161
Maximum | Price-based | Level 3 | Commodity Correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 0.9373  
Maximum | Price-based | Level 3 | Commodity Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 1.0792  
Maximum | Price-based | Level 3 | Forward Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 6.8312 3.2485
Maximum | Price-based | Level 3 | Recovery Rate | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.7500 0.7500
Maximum | Price-based | Level 3 | Credit Correlation | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.7000 0.8000
Maximum | Price-based | Level 3 | Upfront Points | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.9900  
Maximum | Price-based | Level 3 | Cost of Capital    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities   0.1750
Maximum | Price-based | Level 3 | Credit Spread Volatility | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   0.6479
Maximum | Comparable analysis | Level 3 | Illiquidity Discount    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 0.1100 0.1700
Maximum | Cash flow | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage servicing rights 0.1200 0.1320
Maximum | Cash flow | Level 3 | PE Ratio    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 16.40  
Maximum | Cash flow | Level 3 | Discount to price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 0.3300  
Maximum | Cash flow | Level 3 | Revenue Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 16.60  
Maximum | Forward price | Level 3 | Equity Forward    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Interest-bearing deposits 1.0000  
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 1.75% 2.61%
Securities loaned and sold under agreement to repurchase 0.0372  
Securities Loaned And Sold Under Agreements To Repurchase, Measurement Input   0.0407
Weighted Average | Model-based | Level 3 | Credit Spread    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities borrowed and purchased under agreements to resell 0.15% 0.15%
Weighted Average | Model-based | Level 3 | Credit Spread | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   0.0594
Weighted Average | Model-based | Level 3 | Credit Spread | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0131 0.010127
Weighted Average | Model-based | Level 3 | Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 83.60  
Weighted Average | Model-based | Level 3 | WAL    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Marketable equity securities 2 2.24
Mortgage servicing rights | year 7.59 7.71
Weighted Average | Model-based | Level 3 | WAL | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   2.24
Weighted Average | Model-based | Level 3 | Recovery    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Marketable equity securities $ 7,148,000,000  
Marketable equity securities   7,148,000,000
Derivative assets | year 7,148,000,000  
Weighted Average | Model-based | Level 3 | Recovery | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   $ 7,148,000,000
Weighted Average | Model-based | Level 3 | IR Normal Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Short-term borrowings and long-term debt 0.0082 0.0089
Weighted Average | Model-based | Level 3 | IR Normal Volatility | Interest rate contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0118 0.0096
Weighted Average | Model-based | Level 3 | IR Normal Volatility | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   0.0067
Weighted Average | Model-based | Level 3 | IR Basis | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.0060 (0.0003)
Weighted Average | Model-based | Level 3 | Equity Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases   0.4262
Weighted Average | Model-based | Level 3 | Equity Volatility | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.3169 0.3391
Weighted Average | Model-based | Level 3 | Equity Volatility | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.3315 0.4147
Weighted Average | Model-based | Level 3 | FX Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Securities Loaned Or Sold Under Agreements To Repurchase And Other Trading Liabilities, Measurement Input   0.1285
Weighted Average | Model-based | Level 3 | FX Volatility | Foreign exchange contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.1163  
Weighted Average | Model-based | Level 3 | Equity Forward | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1.0273 1.0350
Weighted Average | Model-based | Level 3 | Equity - FX Correlation | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 2 (0.1633)
Weighted Average | Model-based | Level 3 | Equity-IR Correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.2934  
Weighted Average | Model-based | Level 3 | Equity-IR Correlation | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   0.3237
Weighted Average | Model-based | Level 3 | Commodity Correlation | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.4539 0.3670
Weighted Average | Model-based | Level 3 | Commodity Volatility | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.3169 0.3355
Weighted Average | Model-based | Level 3 | Forward Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Interest-bearing deposits   1.0007
Weighted Average | Model-based | Level 3 | Forward Price | Commodity and other contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 1.4542 1.0608
Weighted Average | Model-based | Level 3 | Equity - Equity Correlation | Equity contracts (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets (0.1489) 0.8563
Weighted Average | Yield analysis | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities 9.44% 9.74%
Asset-backed securities 10.00% 9.34%
Weighted Average | Price-based | Level 3 | Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage-backed securities $ 52.80 $ 51.51
State and municipal, foreign government, corporate and other debt securities 202.70 245.85
Marketable equity securities 87.64 114.29
Asset-backed securities 64.79 74.97
Nontrading derivatives and other financial assets and liabilities measured on a recurring basis (gross) 90.75 $ 92.65
Loans and leases   84.77
Securities sold, not yet purchased and other trading liabilities $ 42  
Securities Loaned Or Sold Under Agreements To Repurchase And Other Trading Liabilities, Measurement Input   41.22
Weighted Average | Price-based | Level 3 | Price | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 35.96  
Derivative assets   $ 78.75
Weighted Average | Price-based | Level 3 | PE Ratio    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities   15.16
Weighted Average | Price-based | Level 3 | Revenue Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities   12.40
Weighted Average | Price-based | Level 3 | Equity Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 0.3090  
Weighted Average | Price-based | Level 3 | Equity Forward    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 1.0276 1.0349
Weighted Average | Price-based | Level 3 | Commodity Correlation    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 0.4539  
Weighted Average | Price-based | Level 3 | Commodity Volatility    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 0.3169  
Weighted Average | Price-based | Level 3 | Forward Price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Loans and leases 1.2962 1.0507
Weighted Average | Price-based | Level 3 | Recovery Rate | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.3977 0.4227
Weighted Average | Price-based | Level 3 | Credit Correlation | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.4700 0.4238
Weighted Average | Price-based | Level 3 | Upfront Points | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets 0.4471  
Weighted Average | Price-based | Level 3 | Cost of Capital    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities   0.1044
Weighted Average | Price-based | Level 3 | Credit Spread Volatility | Credit derivatives (gross)    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Derivative assets   0.4047
Weighted Average | Comparable analysis | Level 3 | Illiquidity Discount    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 0.0879 0.1016
Weighted Average | Cash flow | Level 3 | Yield    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Mortgage servicing rights 0.0460 0.0536
Weighted Average | Cash flow | Level 3 | PE Ratio    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 14.90  
Weighted Average | Cash flow | Level 3 | Discount to price    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 0.1500  
Weighted Average | Cash flow | Level 3 | Revenue Multiple    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Non-marketable equities 14.79  
Weighted Average | Forward price | Level 3 | Equity Forward    
Fair Value Measurement Inputs and Valuation Techniques [Line Items]    
Interest-bearing deposits 1.0000