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FAIR VALUE MEASUREMENT - Valuation Techniques and Inputs for Level 3 Fair Value Measurements (Details)
Dec. 31, 2020
USD ($)
year
Dec. 31, 2019
USD ($)
year
Fair Value Inputs Assets Liabilities Quantitative Information    
Marketable equity securities $ 1,066,000,000 $ 1,162,000,000
Level 3 | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Securities borrowed and purchased under agreements to resell 320,000,000 303,000,000
Mortgage-backed securities   22,000,000
State and municipal, foreign government, corporate and other debt securities 852,000,000 880,000,000
Marketable equity securities 36,000,000 30,000,000
Loans and leases 1,804,000,000 378,000,000
Mortgage servicing rights 78,000,000 77,000,000
Interest-bearing deposits 206,000,000 215,000,000
Securities loaned and sold under agreements to repurchase 631,000,000 757,000,000
Securities sold, not yet purchased and other trading liabilities 178,000,000  
Short-term borrowings and long-term debt 24,827,000,000 17,182,000,000
Level 3 | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage-backed securities 344,000,000 196,000,000
State and municipal, foreign government, corporate and other debt securities 1,566,000,000 677,000,000
Marketable equity securities 36,000,000 70,000,000
Asset-backed securities 863,000,000 812,000,000
Non-marketable equities 142,000,000 97,000,000
Securities sold, not yet purchased and other trading liabilities 62,000,000 46,000,000
Level 3 | Cash flow    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage servicing rights 258,000,000 418,000,000
Level 3 | Comparables analysis    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities 205,000,000 316,000,000
Level 3 | Yield analysis    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage-backed securities 168,000,000  
Asset-backed securities 744,000,000 368,000,000
Level 3 | Interest rate contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives 5,143,000,000 2,196,000,000
Level 3 | Foreign exchange risks | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives 1,296,000,000 1,099,000,000
Level 3 | Equity contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives 7,330,000,000 2,076,000,000
Level 3 | Commodity contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives 1,636,000,000 1,487,000,000
Level 3 | Credit derivatives | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives 1,854,000,000 613,000,000
Level 3 | Credit derivatives | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives $ 408,000,000 $ 341,000,000
Credit spread | Level 3 | Model-based | 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  
Loans and leases, measurement input   0.0009
Credit spread | Level 3 | Model-based | 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 0.0375  
Loans and leases, measurement input   0.0052
Credit spread | Level 3 | Model-based | 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 0.0226  
Loans and leases, measurement input   0.0048
Credit spread | Level 3 | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
State and municipal, foreign government, corporate and other debt securities, measurement input   0.0035
Credit spread | Level 3 | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
State and municipal, foreign government, corporate and other debt securities, measurement input   0.0295
Credit spread | Level 3 | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
State and municipal, foreign government, corporate and other debt securities, measurement input   0.0209
Credit spread | Level 3 | Credit derivatives | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.000350 0.0008
Credit spread | Level 3 | Credit derivatives | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.035235 0.0283
Credit spread | Level 3 | Credit derivatives | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.009989 0.0080
Interest rate | Level 3 | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Securities borrowed and purchased under agreements to resell, measurement input 0.30% 1.59%
Securities loaned and sold under agreements to repurchase, measurement input 0.0008 0.0159
Interest rate | Level 3 | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Securities borrowed and purchased under agreements to resell, measurement input 0.35% 3.67%
Securities loaned and sold under agreements to repurchase, measurement input 0.0186 0.0238
Interest rate | Level 3 | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Securities borrowed and purchased under agreements to resell, measurement input 0.32% 2.72%
Securities loaned and sold under agreements to repurchase, measurement input 0.0071 0.0195
Interest rate | Level 3 | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Securities sold, not yet purchased and other trading liabilities, measurement input 0.1003  
Interest rate | Level 3 | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Securities sold, not yet purchased and other trading liabilities, measurement input 0.2007  
Interest rate | Level 3 | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Securities sold, not yet purchased and other trading liabilities, measurement input 0.1370  
Interest rate | Level 3 | Foreign exchange risks | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0084 0.0272
Interest rate | Level 3 | Foreign exchange risks | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.8409 0.5614
Interest rate | Level 3 | Foreign exchange risks | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.1755 0.1311
Price | Level 3 | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
State and municipal, foreign government, corporate and other debt securities, measurement input value   $ 0
Marketable equity securities, measurement input value $ 0  
Price | Level 3 | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
State and municipal, foreign government, corporate and other debt securities, measurement input value   1,238
Marketable equity securities, measurement input value 31,000  
Price | Level 3 | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
State and municipal, foreign government, corporate and other debt securities, measurement input value   90
Marketable equity securities, measurement input value 5,132  
Price | Level 3 | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage-backed securities, measurement input value 30 36
State and municipal, foreign government, corporate and other debt securities, measurement input value 0  
Marketable equity securities, measurement input value   0
Asset-backed securities, measurement input, value 2 4
Non-marketable equities, measurement input value 136 3
Securities sold, not yet purchased and other trading liabilities, measurement input value 0 0
Price | Level 3 | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage-backed securities, measurement input value 111 505
State and municipal, foreign government, corporate and other debt securities, measurement input value 2,265  
Marketable equity securities, measurement input value   38,500
Asset-backed securities, measurement input, value 157 103
Non-marketable equities, measurement input value 2,041 2,019
Securities sold, not yet purchased and other trading liabilities, measurement input value 866 866
Price | Level 3 | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage-backed securities, measurement input value 80 97
State and municipal, foreign government, corporate and other debt securities, measurement input value 90  
Marketable equity securities, measurement input value   2,979
Asset-backed securities, measurement input, value 59 60
Non-marketable equities, measurement input value 1,647 1,020
Securities sold, not yet purchased and other trading liabilities, measurement input value $ 80 96
Price | Level 3 | Credit derivatives | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input value   12
Price | Level 3 | Credit derivatives | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input value   100
Price | Level 3 | Credit derivatives | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input value   $ 87
WAL | Level 3 | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Marketable equity securities, measurement input | year   1.48
Mortgage servicing rights, measurement input | year 2.66 4.07
WAL | Level 3 | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Marketable equity securities, measurement input | year   1.48
Mortgage servicing rights, measurement input | year 5.40 8.13
WAL | Level 3 | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Marketable equity securities, measurement input | year   1.48
Mortgage servicing rights, measurement input | year 4.46 6.61
WAL | Level 3 | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Marketable equity securities, measurement input | year 1.48  
WAL | Level 3 | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Marketable equity securities, measurement input | year 1.48  
WAL | Level 3 | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Marketable equity securities, measurement input | year 1.48  
WAL | Level 3 | Equity contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input | year   1.48
WAL | Level 3 | Equity contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input | year   1.48
WAL | Level 3 | Equity contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input | year   1.48
Recovery | Level 3 | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Marketable equity securities, measurement input value   $ 5,450,000,000
Recovery | Level 3 | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Marketable equity securities, measurement input value   5,450,000,000
Recovery | Level 3 | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Marketable equity securities, measurement input value   $ 5,450,000,000
Recovery | Level 3 | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Marketable equity securities, measurement input value $ 5,733,000,000  
Recovery | Level 3 | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Marketable equity securities, measurement input value 5,733,000,000  
Recovery | Level 3 | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Marketable equity securities, measurement input value $ 5,733,000,000  
Recovery | Level 3 | Equity contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   5,450,000,000
Recovery | Level 3 | Equity contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   5,450,000,000
Recovery | Level 3 | Equity contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   5,450,000,000
Yield | Level 3 | Cash flow | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage servicing rights, measurement input 0.0286 0.0178
Yield | Level 3 | Cash flow | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage servicing rights, measurement input 0.1600 0.1200
Yield | Level 3 | Cash flow | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage servicing rights, measurement input 0.0632 0.0949
Yield | Level 3 | Yield analysis | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage-backed securities, measurement input 2.63%  
Asset-backed securities, measurement input 3.77% 0.61%
Yield | Level 3 | Yield analysis | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage-backed securities, measurement input 21.80%  
Asset-backed securities, measurement input 21.77% 23.38%
Yield | Level 3 | Yield analysis | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mortgage-backed securities, measurement input 10.13%  
Asset-backed securities, measurement input 9.01% 8.88%
Illiquidity discount | Level 3 | Comparables analysis | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 0.1000  
Illiquidity discount | Level 3 | Comparables analysis | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 0.4500  
Illiquidity discount | Level 3 | Comparables analysis | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 0.2529  
PE ratio | Level 3 | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input   14.70
PE ratio | Level 3 | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input   28.70
PE ratio | Level 3 | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input   20.54
PE ratio | Level 3 | Comparables analysis | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 13.60  
PE ratio | Level 3 | Comparables analysis | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 28.00  
PE ratio | Level 3 | Comparables analysis | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 22.83  
EBITDA multiple | Level 3 | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 3.30  
EBITDA multiple | Level 3 | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 36.70  
EBITDA multiple | Level 3 | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 15.10  
EBITDA multiple | Level 3 | Comparables analysis | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input   7.00
EBITDA multiple | Level 3 | Comparables analysis | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input   17.95
EBITDA multiple | Level 3 | Comparables analysis | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input   10.34
Adjustment factor | Level 3 | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 0.20  
Adjustment factor | Level 3 | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 0.61  
Adjustment factor | Level 3 | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 0.25  
Appraised value | Level 3 | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input value $ 287,000 $ 397,000
Appraised value | Level 3 | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input value 39,745,000 33,246,000
Appraised value | Level 3 | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input value $ 21,754,000 $ 8,446,000
Revenue multiple | Level 3 | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 2.70  
Revenue multiple | Level 3 | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 28.00  
Revenue multiple | Level 3 | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input 8.92  
Price-to-book ratio | Level 3 | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input   1.50
Price-to-book ratio | Level 3 | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input   3.00
Price-to-book ratio | Level 3 | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input   1.88
Discount to price | Level 3 | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input   0
Discount to price | Level 3 | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input   0.1000
Discount to price | Level 3 | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Non-marketable equities, measurement input   0.0232
Inflation volatility | Level 3 | Interest rate contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0027 0.0021
Inflation volatility | Level 3 | Interest rate contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0236 0.0274
Inflation volatility | Level 3 | Interest rate contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0078 0.0079
Mean reversion | Level 3 | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest-bearing deposits, measurement input   0.0100
Short-term borrowings and long-term debt, measurement input   0.0100
Mean reversion | Level 3 | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest-bearing deposits, measurement input   0.2000
Short-term borrowings and long-term debt, measurement input   0.2000
Mean reversion | Level 3 | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest-bearing deposits, measurement input   0.1050
Short-term borrowings and long-term debt, measurement input   0.1050
Mean reversion | Level 3 | Interest rate contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   0.0100
Mean reversion | Level 3 | Interest rate contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   0.2000
Mean reversion | Level 3 | Interest rate contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   0.1050
IR normal volatility | Level 3 | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest-bearing deposits, measurement input 0.0011  
Short-term borrowings and long-term debt, measurement input 0.0011 0.0009
IR normal volatility | Level 3 | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest-bearing deposits, measurement input 0.0073  
Short-term borrowings and long-term debt, measurement input 0.0073 0.0066
IR normal volatility | Level 3 | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest-bearing deposits, measurement input 0.0054  
Short-term borrowings and long-term debt, measurement input 0.0051 0.0046
IR normal volatility | Level 3 | Interest rate contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0011 0.0009
IR normal volatility | Level 3 | Interest rate contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0073 0.0066
IR normal volatility | Level 3 | Interest rate contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0052 0.0053
IR normal volatility | Level 3 | Foreign exchange risks | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0011 0.0027
IR normal volatility | Level 3 | Foreign exchange risks | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0052 0.0066
IR normal volatility | Level 3 | Foreign exchange risks | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0046 0.0058
FX volatility | Level 3 | Foreign exchange risks | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0170 0.0127
FX volatility | Level 3 | Foreign exchange risks | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.1263 0.1216
FX volatility | Level 3 | Foreign exchange risks | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0541 0.0917
Contingent event | Level 3 | Foreign exchange risks | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 1.0000  
Contingent event | Level 3 | Foreign exchange risks | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 1.0000  
Contingent event | Level 3 | Foreign exchange risks | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 1.0000  
FX rate | Level 3 | Foreign exchange risks | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   0.3739
FX rate | Level 3 | Foreign exchange risks | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   5.8684
FX rate | Level 3 | Foreign exchange risks | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input   0.8064
IR-IR correlation | Level 3 | Foreign exchange risks | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input (0.2171) (0.5100)
IR-IR correlation | Level 3 | Foreign exchange risks | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.4000 0.4000
IR-IR correlation | Level 3 | Foreign exchange risks | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.3809 0.3200
IR-FX correlation | Level 3 | Foreign exchange risks | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.4000 0.4000
IR-FX correlation | Level 3 | Foreign exchange risks | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.6000 0.6000
IR-FX correlation | Level 3 | Foreign exchange risks | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.5000 0.5000
Equity volatility | Level 3 | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Loans and leases, measurement input 0.2465 0.3200
Equity volatility | Level 3 | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Loans and leases, measurement input 0.8309 0.3200
Equity volatility | Level 3 | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Loans and leases, measurement input 0.5823 0.3200
Equity volatility | Level 3 | Equity contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0500 0.0316
Equity volatility | Level 3 | Equity contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.9143 0.5280
Equity volatility | Level 3 | Equity contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.4274 0.2843
Forward price | Level 3 | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest-bearing deposits, measurement input   0.9759
Short-term borrowings and long-term debt, measurement input 0.1540 0.3762
Forward price | Level 3 | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest-bearing deposits, measurement input   1.1106
Short-term borrowings and long-term debt, measurement input 2.6200 3.6257
Forward price | Level 3 | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest-bearing deposits, measurement input   1.0296
Short-term borrowings and long-term debt, measurement input 0.9248 0.9752
Forward price | Level 3 | Equity contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.6588 0.6260
Forward price | Level 3 | Equity contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 1.0520 1.1269
Forward price | Level 3 | Equity contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.9182 0.9846
Forward price | Level 3 | Commodity contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.1540 0.3762
Forward price | Level 3 | Commodity contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 2.6200 3.6257
Forward price | Level 3 | Commodity contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.9853 1.1932
Commodity volatility | Level 3 | Commodity contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.0016 0.0525
Commodity volatility | Level 3 | Commodity contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.8017 0.9363
Commodity volatility | Level 3 | Commodity contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.2372 0.2355
Commodity correlation | Level 3 | Commodity contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input (0.4492) (0.3965)
Commodity correlation | Level 3 | Commodity contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.9591 0.8781
Commodity correlation | Level 3 | Commodity contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.7060 0.4180
Recovery rate | Level 3 | Credit derivatives | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.2000 0.2000
Recovery rate | Level 3 | Credit derivatives | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.6000 0.6500
Recovery rate | Level 3 | Credit derivatives | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.4160 0.4800
Credit correlation | Level 3 | Credit derivatives | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.2500 0.2500
Credit correlation | Level 3 | Credit derivatives | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.8000 0.8700
Credit correlation | Level 3 | Credit derivatives | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.4336 0.4857
Upfront points | Level 3 | Credit derivatives | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0 0.0259
Upfront points | Level 3 | Credit derivatives | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 1.0720 0.9994
Upfront points | Level 3 | Credit derivatives | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, measurement input 0.4810 0.5941
IR lognormal volatility | Level 3 | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Securities sold, not yet purchased and other trading liabilities, measurement input 0.5206  
IR lognormal volatility | Level 3 | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Securities sold, not yet purchased and other trading liabilities, measurement input 1.2887  
IR lognormal volatility | Level 3 | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Securities sold, not yet purchased and other trading liabilities, measurement input 0.8982  
Equity-IR correlation | Level 3 | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Short-term borrowings and long-term debt, measurement input   0.1500
Equity-IR correlation | Level 3 | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Short-term borrowings and long-term debt, measurement input   0.4400
Equity-IR correlation | Level 3 | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Short-term borrowings and long-term debt, measurement input   0.3266