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FAIR VALUE MEASUREMENT (Details 3) (Level 3, USD $)
0 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2014
Dec. 31, 2013
item
Sep. 30, 2014
Dec. 31, 2013
Mortgage-backed securities | Price-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Total assets $ 2,814,000,000 [1] $ 2,869,000,000 [1] $ 2,814,000,000 [1] $ 2,869,000,000 [1]
Mortgage-backed securities | Price-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price 0.03 [2],[3] 0.10 [2],[3] 0.03 [2],[3] 0.10 [2],[3]
Mortgage-backed securities | Price-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price 112.87 [2],[3] 117.78 [2],[3] 112.87 [2],[3] 117.78 [2],[3]
Mortgage-backed securities | Price-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price 84.66 [4] 77.60 [4] 84.66 [4] 77.60 [4]
Mortgage-backed securities | Yield analysis
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Total assets 905,000,000 [1] 1,241,000,000 [1] 905,000,000 [1] 1,241,000,000 [1]
Mortgage-backed securities | Yield analysis | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Yield (as a percent) 0.01% [2],[3] 0.03% [2],[3]    
Mortgage-backed securities | Yield analysis | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Yield (as a percent) 21.53% [2],[3] 21.80% [2],[3]    
Mortgage-backed securities | Yield analysis | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Yield (as a percent) 7.08% [4] 8.66% [4]    
State and municipal, foreign government, corporate, and other debt securities | Cash flow
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Total assets 1,638,000,000 [1] 2,014,000,000 [1] 1,638,000,000 [1] 2,014,000,000 [1]
State and municipal, foreign government, corporate, and other debt securities | Cash flow | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Credit spread     0.60% [2],[3] 0.11% [2],[3]
State and municipal, foreign government, corporate, and other debt securities | Cash flow | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Credit spread     6.00% [2],[3] 3.75% [2],[3]
State and municipal, foreign government, corporate, and other debt securities | Cash flow | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Credit spread     2.24% [4] 2.13% [4]
State and municipal, foreign government, corporate, and other debt securities | Price-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Total assets 7,011,000,000 [1] 5,361,000,000 [1] 7,011,000,000 [1] 5,361,000,000 [1]
State and municipal, foreign government, corporate, and other debt securities | Price-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price 155.70 [2],[3] 126.49 [2],[3] 155.70 [2],[3] 126.49 [2],[3]
State and municipal, foreign government, corporate, and other debt securities | Price-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price 90.50 [4] 87.47 [4] 90.50 [4] 87.47 [4]
Equity securities | Cash flow
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Total assets 755,000,000 [1],[5] 827,000,000 [1],[5] 755,000,000 [1],[5] 827,000,000 [1],[5]
Equity securities | Cash flow | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Yield (as a percent) 4.00% [2],[3],[5] 4.00% [2],[3],[5]    
WAL 0 years 36 days [2],[3],[5] 4 days [2],[3],[5]    
Equity securities | Cash flow | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Yield (as a percent) 5.00% [2],[3],[5] 5.00% [2],[3],[5]    
WAL 3 years 6 months 14 days [2],[3],[5] 3 years 6 months 18 days [2],[3],[5]    
Equity securities | Cash flow | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Yield (as a percent) 4.50% [4],[5] 4.50% [4],[5]    
WAL 1 year 1 month 14 days [4],[5] 1 year 4 months 17 days [4],[5]    
Equity securities | Price-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Total assets 1,874,000,000 [1],[5] 947,000,000 [1],[5] 1,874,000,000 [1],[5] 947,000,000 [1],[5]
Equity securities | Price-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price   0.31 [2],[3],[5]   0.31 [2],[3],[5]
Equity securities | Price-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price 150.00 [2],[3],[5] 93.66 [2],[3],[5] 150.00 [2],[3],[5] 93.66 [2],[3],[5]
Equity securities | Price-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price 69.64 [4],[5] 86.90 [4],[5] 69.64 [4],[5] 86.90 [4],[5]
Asset-backed securities | Model-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Total assets   1,300,000,000 [1]   1,300,000,000 [1]
Asset-backed securities | Model-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Credit spread       0.25% [2],[3]
Asset-backed securities | Model-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Credit spread       3.78% [2],[3]
Asset-backed securities | Model-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Credit spread       3.02% [4]
Asset-backed securities | Price-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Total assets 3,786,000,000 [1] 4,539,000,000 [1] 3,786,000,000 [1] 4,539,000,000 [1]
Asset-backed securities | Price-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price 105.50 [2],[3] 135.83 [2],[3] 105.50 [2],[3] 135.83 [2],[3]
Asset-backed securities | Price-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price 70.02 [4] 70.89 [4] 70.02 [4] 70.89 [4]
Non-marketable equity securities | Cash flow
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Total assets 400,000,000 [1] 533,000,000 [1] 400,000,000 [1] 533,000,000 [1]
Non-marketable equity securities | Cash flow | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price-earnings ratio 8.30 [2],[3] 9.10 [2],[3]    
Price-to-book ratio 1.00 [2],[3] 0.90 [2],[3]    
Non-marketable equity securities | Cash flow | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price-earnings ratio 8.30 [2],[3] 9.10 [2],[3]    
Price-to-book ratio 1.56 [2],[3] 1.05 [2],[3]    
Non-marketable equity securities | Cash flow | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price-earnings ratio 8.30 [4] 9.10 [4]    
Price-to-book ratio 1.15 [4] 1.02 [4]    
Non-marketable equity securities | Price-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Total assets 1,629,000,000 [1] 2,324,000,000 [1] 1,629,000,000 [1] 2,324,000,000 [1]
Non-marketable equity securities | Price-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Fund NAV   612 [2],[3]   612 [2],[3]
Non-marketable equity securities | Price-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Discount to price (as a percent) 90.00% [2],[3]   90.00% [2],[3]  
Fund NAV   336,559,340 [2],[3]   336,559,340 [2],[3]
Non-marketable equity securities | Price-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Discount to price (as a percent) 8.19% [4]   8.19% [4]  
Fund NAV   124,080,454 [4]   124,080,454 [4]
Non-marketable equity securities | Comparables Analysis
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Total assets 1,179,000,000 [1] 1,470,000,000 [1] 1,179,000,000 [1] 1,470,000,000 [1]
Non-marketable equity securities | Comparables Analysis | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
EBITDA multiples 5.20 [2],[3] 4.20 [2],[3]    
Non-marketable equity securities | Comparables Analysis | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
EBITDA multiples 12.50 [2],[3] 16.90 [2],[3]    
Non-marketable equity securities | Comparables Analysis | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
EBITDA multiples 9.48 [4] 9.78 [4]    
Trading account assets and liabilities | Interest rate contracts | Model-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Fair value (gross) 6,989,000,000 [1],[6] 5,721,000,000 [1],[6] 6,989,000,000 [1],[6] 5,721,000,000 [1],[6]
Trading account assets and liabilities | Interest rate contracts | Model-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
IR lognormal volatility 14.15% [2],[3],[6] 10.60% [2],[3],[6]    
Mean reversion 1.00% [2],[3],[6]      
Trading account assets and liabilities | Interest rate contracts | Model-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
IR lognormal volatility 76.70% [2],[3],[6] 87.20% [2],[3],[6]    
Mean reversion 20.00% [2],[3],[6]      
Trading account assets and liabilities | Interest rate contracts | Model-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
IR lognormal volatility 24.27% [4],[6] 21.16% [4],[6]    
Mean reversion 10.44% [4],[6]      
Trading account assets and liabilities | Foreign exchange contracts | Model-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Fair value (gross) 1,198,000,000 [1],[6] 1,727,000,000 [1],[6] 1,198,000,000 [1],[6] 1,727,000,000 [1],[6]
Trading account assets and liabilities | Foreign exchange contracts | Model-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Foreign exchange (FX) volatility (as a Percent) 0.45% [2],[3],[6] 1.00% [2],[3],[6]    
Trading account assets and liabilities | Foreign exchange contracts | Model-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Foreign exchange (FX) volatility (as a Percent) 23.10% [2],[3],[6] 28.00% [2],[3],[6]    
Trading account assets and liabilities | Foreign exchange contracts | Model-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Foreign exchange (FX) volatility (as a Percent) 9.24% [4],[6] 13.45% [4],[6]    
Trading account assets and liabilities | Foreign exchange contracts | Cash flow
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Fair value (gross) 291,000,000 [1],[6] 189,000,000 [1],[6] 291,000,000 [1],[6] 189,000,000 [1],[6]
Trading account assets and liabilities | Foreign exchange contracts | Cash flow | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Interest rate (as a percent) 5.00% [2],[3],[6] 0.11% [2],[3],[6]    
Credit spread       0.25% [2],[3],[6]
IR-FX correlation 40.00% [2],[3],[6] 40.00% [2],[3],[6]    
IR-IR correlation 40.00% [2],[3],[6] 40.00% [2],[3],[6]    
Trading account assets and liabilities | Foreign exchange contracts | Cash flow | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Interest rate (as a percent) 12.75% [2],[3],[6] 13.88% [2],[3],[6]    
Credit spread       4.19% [2],[3],[6]
IR-FX correlation 60.00% [2],[3],[6] 60.00% [2],[3],[6]    
IR-IR correlation 40.00% [2],[3],[6] 68.79% [2],[3],[6]    
Trading account assets and liabilities | Foreign exchange contracts | Cash flow | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Interest rate (as a percent) 5.83% [4],[6] 6.02% [4],[6]    
Credit spread       1.62% [4],[6]
IR-FX correlation 50.00% [4],[6] 50.00% [4],[6]    
IR-IR correlation 40.00% [4],[6] 40.52% [4],[6]    
Trading account assets and liabilities | Equity contracts | Model-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Fair value (gross) 4,258,000,000 [1],[6],[7] 3,189,000,000 [1],[6],[7] 4,258,000,000 [1],[6],[7] 3,189,000,000 [1],[6],[7]
Trading account assets and liabilities | Equity contracts | Model-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Equity volatility 8.22% [2],[3],[6],[7] 10.02% [2],[3],[6],[7]    
Trading account assets and liabilities | Equity contracts | Model-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Equity volatility 80.00% [2],[3],[6],[7] 73.48% [2],[3],[6],[7]    
Trading account assets and liabilities | Equity contracts | Model-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Equity volatility 26.79% [4],[6],[7] 29.87% [4],[6],[7]    
Trading account assets and liabilities | Equity contracts | Price-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Fair value (gross) 870,000,000 [1],[6],[7] 563,000,000 [1],[6],[7] 870,000,000 [1],[6],[7] 563,000,000 [1],[6],[7]
Trading account assets and liabilities | Equity contracts | Price-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Equity forward 84.19% [2],[3],[6],[7] 79.10% [2],[3],[6],[7]    
Equity-FX correlation (84.00%) [2],[3],[6],[7] (70.00%) [2],[3],[6],[7]    
Equity-Equity correlation (66.30%) [2],[3],[6],[7] (81.30%) [2],[3],[6],[7]    
Trading account assets and liabilities | Equity contracts | Price-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Equity forward 121.00% [2],[3],[6],[7] 141.00% [2],[3],[6],[7]    
Equity-FX correlation 71.00% [2],[3],[6],[7] 55.00% [2],[3],[6],[7]    
Equity-Equity correlation 99.00% [2],[3],[6],[7] 99.40% [2],[3],[6],[7]    
Trading account assets and liabilities | Equity contracts | Price-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Equity forward 98.80% [4],[6],[7] 100.24% [4],[6],[7]    
Equity-FX correlation (23.66%) [4],[6],[7] 0.60% [4],[6],[7]    
Equity-Equity correlation 41.41% [4],[6],[7] 48.45% [4],[6],[7]    
Trading account assets and liabilities | Commodity contracts | Model-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Fair value (gross) 2,605,000,000 [1],[6] 2,988,000,000 [1],[6] 2,605,000,000 [1],[6] 2,988,000,000 [1],[6]
Trading account assets and liabilities | Commodity contracts | Model-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Commodity volatility (as a percent) 5.00% [2],[3],[6] 4.00% [2],[3],[6]    
Commodity correlation (52.00%) [2],[3],[6] (75.00%) [2],[3],[6]    
Forward price 54.72% [2],[3],[6] 23.00% [2],[3],[6]    
Trading account assets and liabilities | Commodity contracts | Model-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Commodity volatility (as a percent) 66.00% [2],[3],[6] 146.00% [2],[3],[6]    
Commodity correlation 90.00% [2],[3],[6] 90.00% [2],[3],[6]    
Forward price 226.83% [2],[3],[6] 242.00% [2],[3],[6]    
Trading account assets and liabilities | Commodity contracts | Model-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Commodity volatility (as a percent) 15.00% [4],[6] 15.00% [4],[6]    
Commodity correlation 27.00% [4],[6] 32.00% [4],[6]    
Forward price 96.86% [4],[6] 105.00% [4],[6]    
Trading account assets and liabilities | Credit derivatives | Model-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Fair value (gross) 4,437,000,000 [1],[6] 4,767,000,000 [1],[6] 4,437,000,000 [1],[6] 4,767,000,000 [1],[6]
Trading account assets and liabilities | Credit derivatives | Model-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Recovery rate (as a percent) 12.00% [2],[3],[6] 20.00% [2],[3],[6]    
Trading account assets and liabilities | Credit derivatives | Model-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Recovery rate (as a percent) 60.00% [2],[3],[6] 64.00% [2],[3],[6]    
Trading account assets and liabilities | Credit derivatives | Model-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Recovery rate (as a percent) 38.69% [4],[6] 38.11% [4],[6]    
Trading account assets and liabilities | Credit derivatives | Price-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Fair value (gross) 1,580,000,000 [1],[6] 1,520,000,000 [1],[6] 1,580,000,000 [1],[6] 1,520,000,000 [1],[6]
Trading account assets and liabilities | Credit derivatives | Price-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price 0.25 [2],[3],[6] 0.02 [2],[3],[6] 0.25 [2],[3],[6] 0.02 [2],[3],[6]
Credit spread     0.01% [2],[3],[6] 0.03% [2],[3],[6]
Fair Value Inputs Credit Correlation   5.00% [2],[3],[6]    
Credit IR correlation 5.00% [2],[3],[6]      
Upfront points 1.01 [2],[3],[6] 2.31 [2],[3],[6]    
Trading account assets and liabilities | Credit derivatives | Price-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price 108.67 [2],[3],[6] 115.20 [2],[3],[6] 108.67 [2],[3],[6] 115.20 [2],[3],[6]
Credit spread     13.77% [2],[3],[6] 13.35% [2],[3],[6]
Fair Value Inputs Credit Correlation   95.00% [2],[3],[6]    
Credit IR correlation 95.00% [2],[3],[6]      
Upfront points 99.90 [2],[3],[6] 100.00 [2],[3],[6]    
Trading account assets and liabilities | Credit derivatives | Price-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price 44.08 [4],[6] 29.83 [4],[6] 44.08 [4],[6] 29.83 [4],[6]
Credit spread     2.08% [4],[6] 2.03% [4],[6]
Fair Value Inputs Credit Correlation   47.43% [4],[6]    
Credit IR correlation 58.89% [4],[6]      
Upfront points 71.85 [4],[6] 57.69 [4],[6]    
Nontrading derivatives and other financial assets and liabilities | Model-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Fair value (gross) 45,000,000 [1],[6] 38,000,000 [1],[6] 45,000,000 [1],[6] 38,000,000 [1],[6]
Nontrading derivatives and other financial assets and liabilities | Model-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Interest rate (as a percent) 7.01% [2],[3],[6]      
Price-to-book ratio   1.05 [2],[3],[6]    
Nontrading derivatives and other financial assets and liabilities | Model-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Interest rate (as a percent) 7.03% [2],[3],[6]      
Price-to-book ratio   1.05 [2],[3],[6]    
Nontrading derivatives and other financial assets and liabilities | Model-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Interest rate (as a percent) 7.02% [4],[6]      
Price-to-book ratio   1.05 [4],[6]    
Nontrading derivatives and other financial assets and liabilities | Price-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Fair value (gross) 47,000,000 [1],[6] 82,000,000 [1],[6] 47,000,000 [1],[6] 82,000,000 [1],[6]
Nontrading derivatives and other financial assets and liabilities | Price-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price 0.00 [2],[3],[6]   0.00 [2],[3],[6]  
EBITDA multiples   5.20 [2],[3],[6]    
Nontrading derivatives and other financial assets and liabilities | Price-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price 133.00 [2],[3],[6]   133.00 [2],[3],[6]  
EBITDA multiples   12.60 [2],[3],[6]    
Nontrading derivatives and other financial assets and liabilities | Price-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price 100.29 [4],[6]   100.29 [4],[6]  
EBITDA multiples   12.08 [4],[6]    
Nontrading derivatives and other financial assets and liabilities | Comparables Analysis
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Fair value (gross) 23,000,000 [1],[6] 60,000,000 [1],[6] 23,000,000 [1],[6] 60,000,000 [1],[6]
Nontrading derivatives and other financial assets and liabilities | Comparables Analysis | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
EBITDA multiples 3.60 [2],[3],[6]      
Price-earnings ratio 9.40 [2],[3],[6] 6.90 [2],[3],[6]    
Price-to-book ratio 1.20 [2],[3],[6]      
Redemption rate (as a percent) 3.00% [2],[3],[6]      
Nontrading derivatives and other financial assets and liabilities | Comparables Analysis | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
EBITDA multiples 12.50 [2],[3],[6]      
Price-earnings ratio 9.40 [2],[3],[6] 6.90 [2],[3],[6]    
Price-to-book ratio 1.20 [2],[3],[6]      
Redemption rate (as a percent) 99.50% [2],[3],[6]      
Nontrading derivatives and other financial assets and liabilities | Comparables Analysis | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
EBITDA multiples 11.52 [4],[6]      
Price-earnings ratio 9.40 [4],[6] 6.90 [4],[6]    
Price-to-book ratio 1.20 [4],[6]      
Redemption rate (as a percent) 66.38% [4],[6]      
Fixed Income Securities
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Fair Value Inputs Price for Instrument Valued at Par 100   100  
Interest-bearing deposits | Model-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Liabilities 805,000,000 [1] 890,000,000 [1] 805,000,000 [1] 890,000,000 [1]
Interest-bearing deposits | Model-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Mean reversion 1.00% [2],[3] 1.00% [2],[3]    
Equity volatility   14.79% [2],[3]    
Commodity volatility (as a percent) 5.00% [2],[3] 4.00% [2],[3]    
Commodity correlation (52.00%) [2],[3] (75.00%) [2],[3]    
Forward price 54.72% [2],[3] 23.00% [2],[3]    
Equity-IR correlation 31.00% [2],[3] 9.00% [2],[3]    
Interest-bearing deposits | Model-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Mean reversion 20.00% [2],[3] 20.00% [2],[3]    
Equity volatility   42.15% [2],[3]    
Commodity volatility (as a percent) 66.00% [2],[3] 146.00% [2],[3]    
Commodity correlation 90.00% [2],[3] 90.00% [2],[3]    
Forward price 226.83% [2],[3] 242.00% [2],[3]    
Equity-IR correlation 31.00% [2],[3] 20.50% [2],[3]    
Interest-bearing deposits | Model-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Mean reversion 10.50% [4] 10.50% [4]    
Equity volatility   27.74% [4]    
Commodity volatility (as a percent) 15.00% [4] 15.00% [4]    
Commodity correlation 27.00% [4] 32.00% [4]    
Forward price 96.86% [4] 105.00% [4]    
Equity-IR correlation 31.00% [4] 19.81% [4]    
Federal funds purchased and securities loaned or sold under agreements to repurchase | Model-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Liabilities 1,034,000,000 [1] 902,000,000 [1] 1,034,000,000 [1] 902,000,000 [1]
Federal funds purchased and securities loaned or sold under agreements to repurchase | Model-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Interest rate (as a percent) 0.77% [2],[3] 0.47% [2],[3]    
Federal funds purchased and securities loaned or sold under agreements to repurchase | Model-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Interest rate (as a percent) 2.72% [2],[3] 3.66% [2],[3]    
Federal funds purchased and securities loaned or sold under agreements to repurchase | Model-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Interest rate (as a percent) 2.34% [4] 2.71% [4]    
Trading account liabilities | Securities sold, not yet purchased | Model-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Liabilities   289,000,000 [1]   289,000,000 [1]
Trading account liabilities | Securities sold, not yet purchased | Model-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Credit spread       1.66% [2],[3]
Trading account liabilities | Securities sold, not yet purchased | Model-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Credit spread       1.80% [2],[3]
Trading account liabilities | Securities sold, not yet purchased | Model-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Credit spread       1.75% [4]
Trading account liabilities | Securities sold, not yet purchased | Price-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Liabilities 333,000,000 [1] 273,000,000 [1] 333,000,000 [1] 273,000,000 [1]
Trading account liabilities | Securities sold, not yet purchased | Price-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Credit IR correlation (70.49%) [2],[3] (68.00%) [2],[3]    
Trading account liabilities | Securities sold, not yet purchased | Price-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Credit IR correlation 5.37% [2],[3] 5.00% [2],[3]    
Trading account liabilities | Securities sold, not yet purchased | Price-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Credit IR correlation (41.74%) [4] (50.00%) [4]    
Short-term borrowings and long-term debt | Model-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Liabilities 7,531,000,000 [1] 6,781,000,000 [1] 7,531,000,000 [1] 6,781,000,000 [1]
Short-term borrowings and long-term debt | Model-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
IR lognormal volatility 11.86% [2],[3] 10.60% [2],[3]    
Mean reversion 1.00% [2],[3]      
Equity volatility 14.20% [2],[3]      
Equity forward 90.00% [2],[3]      
Equity-FX correlation (84.00%) [2],[3]      
Equity-Equity correlation (66.30%) [2],[3]      
Commodity volatility (as a percent) 5.00% [2],[3]      
Commodity correlation (52.00%) [2],[3]      
Forward price 54.72% [2],[3]      
Short-term borrowings and long-term debt | Model-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
IR lognormal volatility 87.59% [2],[3] 87.20% [2],[3]    
Mean reversion 20.00% [2],[3]      
Equity volatility 27.10% [2],[3]      
Equity forward 121.00% [2],[3]      
Equity-FX correlation 48.70% [2],[3]      
Equity-Equity correlation 99.00% [2],[3]      
Commodity volatility (as a percent) 66.00% [2],[3]      
Commodity correlation 90.00% [2],[3]      
Forward price 226.83% [2],[3]      
Short-term borrowings and long-term debt | Model-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
IR lognormal volatility 23.93% [4] 20.97% [4]    
Mean reversion 10.44% [4]      
Equity volatility 22.45% [4]      
Equity forward 98.40% [4]      
Equity-FX correlation (26.80%) [4]      
Equity-Equity correlation 40.90% [4]      
Commodity volatility (as a percent) 15.00% [4]      
Commodity correlation 27.00% [4]      
Forward price 97.33% [4]      
Short-term borrowings and long-term debt | Price-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Liabilities   868,000,000 [1]   868,000,000 [1]
Short-term borrowings and long-term debt | Price-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Interest rate (as a percent)   4.00% [2],[3]    
Equity volatility   10.70% [2],[3]    
Equity forward   79.10% [2],[3]    
Equity-FX correlation   (70.00%) [2],[3]    
Equity-Equity correlation   (81.30%) [2],[3]    
Forward price   23.00% [2],[3]    
Short-term borrowings and long-term debt | Price-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Interest rate (as a percent)   10.00% [2],[3]    
Equity volatility   57.20% [2],[3]    
Equity forward   141.00% [2],[3]    
Equity-FX correlation   55.00% [2],[3]    
Equity-Equity correlation   99.40% [2],[3]    
Forward price   242.00% [2],[3]    
Short-term borrowings and long-term debt | Price-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Interest rate (as a percent)   5.00% [4]    
Equity volatility   19.41% [4]    
Equity forward   99.51% [4]    
Equity-FX correlation   0.60% [4]    
Equity-Equity correlation   48.30% [4]    
Forward price   101.00% [4]    
Federal funds sold and securities borrowed or purchased under agreements to resell | Model-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Total assets 3,006,000,000 [1] 3,299,000,000 [1] 3,006,000,000 [1] 3,299,000,000 [1]
Federal funds sold and securities borrowed or purchased under agreements to resell | Model-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Interest rate (as a percent) 1.69% [2],[3] 1.33% [2],[3]    
Federal funds sold and securities borrowed or purchased under agreements to resell | Model-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Interest rate (as a percent) 2.18% [2],[3] 2.19% [2],[3]    
Federal funds sold and securities borrowed or purchased under agreements to resell | Model-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Interest rate (as a percent) 2.04% [4] 2.04% [4]    
Loans | Model-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Total assets 570,000,000 [1] 1,422,000,000 [1] 570,000,000 [1] 1,422,000,000 [1]
Loans | Model-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Yield (as a percent)   1.60% [2],[3]    
Credit spread     0.35% [2],[3]  
Loans | Model-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Yield (as a percent)   4.50% [2],[3]    
Credit spread     9.23% [2],[3]  
Loans | Model-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Yield (as a percent)   2.10% [4]    
Credit spread     2.04% [4]  
Loans | Cash flow
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Total assets 1,092,000,000 [1]   1,092,000,000 [1]  
Loans | Cash flow | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Yield (as a percent) 1.60% [2],[3]      
Loans | Cash flow | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Yield (as a percent) 4.50% [2],[3]      
Loans | Cash flow | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Yield (as a percent) 2.23% [4]      
Loans | Price-based
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Total assets 803,000,000 [1] 2,153,000,000 [1] 803,000,000 [1] 2,153,000,000 [1]
Loans | Price-based | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price 5.00 [2],[3]   5.00 [2],[3]  
Loans | Price-based | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price 105.88 [2],[3] 103.75 [2],[3] 105.88 [2],[3] 103.75 [2],[3]
Loans | Price-based | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Price 98.95 [4] 91.19 [4] 98.95 [4] 91.19 [4]
Loans | Yield analysis
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Total assets 442,000,000 [1] 549,000,000 [1] 442,000,000 [1] 549,000,000 [1]
Loans | Yield analysis | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Credit spread       0.49% [2],[3]
Loans | Yield analysis | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Credit spread       16.00% [2],[3]
Loans | Yield analysis | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Credit spread       3.02% [4]
Mortgage servicing rights | Cash flow
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Total assets $ 1,998,000,000 [1] $ 2,625,000,000 [1] $ 1,998,000,000 [1] $ 2,625,000,000 [1]
Mortgage servicing rights | Cash flow | Minimum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Yield (as a percent) 6.14% [2],[3] 3.64% [2],[3]    
WAL 3 years 3 months 18 days [2],[3] 2 years 3 months 7 days [2],[3]    
Mortgage servicing rights | Cash flow | Maximum
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Yield (as a percent) 20.75% [2],[3] 12.00% [2],[3]    
WAL 8 years 5 months 23 days [2],[3] 9 years 5 months 8 days [2],[3]    
Mortgage servicing rights | Cash flow | Weighted Average
       
Fair Value Inputs Assets Liabilities Quantitative Information        
Yield (as a percent) 12.00% [4] 7.19% [4]    
WAL 6 years 1 month 5 days [4] 6 years 1 month 13 days [4]    
[1] The fair value amounts presented in this table represent the primary valuation technique or techniques for each class of assets or liabilities.
[2] Some inputs are shown as zero due to rounding.
[3] When the low and high inputs are the same, there is either a constant input applied to all positions, or the methodology involving the input applies to one large position only.
[4] Weighted averages are calculated based on the fair value of the instrument.
[5] For equity securities, the price input is expressed on an absolute basis, not as a percentage of the notional amount.
[6] Both trading and nontrading account derivatives—assets and liabilities—are presented on a gross absolute value basis.
[7] Includes hybrid products.