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FAIR VALUE MEASUREMENT (Details 3) (Level 3, USD $)
 12 Months Ended
Dec. 31, 2013
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Dec. 31, 2012
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Mortgage-backed securities | Price-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date $ 2,869,000,000  
Mortgage-backed securities | Price-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 0.10  
Mortgage-backed securities | Price-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 117.78  
Mortgage-backed securities | Price-based | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 77.60  
Mortgage-backed securities | Yield analysis
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date 1,241,000,000  
Mortgage-backed securities | Yield analysis | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 0.03%  
Mortgage-backed securities | Yield analysis | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 21.80%  
Mortgage-backed securities | Yield analysis | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 8.66%  
State and municipal, foreign government, corporate, and other debt securities | Cash flow
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date 2,014,000,000  
State and municipal, foreign government, corporate, and other debt securities | Cash flow | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 0.11%  
State and municipal, foreign government, corporate, and other debt securities | Cash flow | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 3.75%  
State and municipal, foreign government, corporate, and other debt securities | Cash flow | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 2.13%  
State and municipal, foreign government, corporate, and other debt securities | Price-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date 5,361,000,000  
State and municipal, foreign government, corporate, and other debt securities | Price-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 126.49  
State and municipal, foreign government, corporate, and other debt securities | Price-based | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 87.47  
Equity securities | Cash flow
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date 827,000,000  
Equity securities | Cash flow | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 4.00%  
WAL 4 days  
Equity securities | Cash flow | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 5.00%  
WAL 3 years 6 months 18 days  
Equity securities | Cash flow | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 4.50%  
WAL 1 year 4 months 17 days  
Equity securities | Price-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date 947,000,000  
Equity securities | Price-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 0.31  
Equity securities | Price-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 93.66  
Equity securities | Price-based | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 86.90  
Asset-backed securities | Price-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date 4,539,000,000  
Asset-backed securities | Price-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 135.83  
Asset-backed securities | Price-based | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 70.89  
Asset-backed securities | Model-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date 1,300,000,000  
Asset-backed securities | Model-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 0.25%  
Asset-backed securities | Model-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 3.78%  
Asset-backed securities | Model-based | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 3.02%  
Non-marketable equity securities | Cash flow
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date 533,000,000  
Non-marketable equity securities | Cash flow | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price-to-book ratio 0.90  
Price-earnings ratio 9.10  
Non-marketable equity securities | Cash flow | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Discount to price (as a percent) 75.00%  
Price-to-book ratio 1.05  
Price-earnings ratio 9.10  
Non-marketable equity securities | Cash flow | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Discount to price (as a percent) 3.47%  
Price-to-book ratio 1.02  
Price-earnings ratio 9.10  
Non-marketable equity securities | Price-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date 2,324,000,000  
Non-marketable equity securities | Price-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fund NAV 612  
Non-marketable equity securities | Price-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fund NAV 336,559,340  
Non-marketable equity securities | Price-based | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fund NAV 124,080,454  
Non-marketable equity securities | Comparables Analysis
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date 1,470,000,000  
Non-marketable equity securities | Comparables Analysis | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
EBITDA multiples 4.20  
Non-marketable equity securities | Comparables Analysis | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
EBITDA multiples 16.90  
Non-marketable equity securities | Comparables Analysis | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
EBITDA multiples 9.78  
Trading account assets and liabilities | Interest rate contracts | Model-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross) 5,721,000,000  
Trading account assets and liabilities | Interest rate contracts | Model-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR lognormal volatility 10.60%  
Trading account assets and liabilities | Interest rate contracts | Model-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR lognormal volatility 87.20%  
Trading account assets and liabilities | Interest rate contracts | Model-based | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR lognormal volatility 21.16%  
Trading account assets and liabilities | Interest rate contracts | Internal model
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross)   3,202,000,000
Trading account assets and liabilities | Interest rate contracts | Internal model | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent)   0.00%
IR volatility (as a percent)   0.09%
IR-IR correlation   (98.00%)
Trading account assets and liabilities | Interest rate contracts | Internal model | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent)   15.00%
Credit spread (as a percent)   5.5027%
IR volatility (as a percent)   100.00%
IR-IR correlation   90.00%
Trading account assets and liabilities | Foreign exchange contracts | Cash flow
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross) 189,000,000  
Trading account assets and liabilities | Foreign exchange contracts | Cash flow | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent) 0.11%  
Credit spread (as a percent) 0.25%  
IR-FX correlation 40.00%  
IR-IR correlation 40.00%  
Trading account assets and liabilities | Foreign exchange contracts | Cash flow | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent) 13.88%  
Credit spread (as a percent) 4.19%  
IR-FX correlation 60.00%  
IR-IR correlation 68.79%  
Trading account assets and liabilities | Foreign exchange contracts | Cash flow | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent) 6.02%  
Credit spread (as a percent) 1.62%  
IR-FX correlation 50.00%  
IR-IR correlation 40.52%  
Trading account assets and liabilities | Foreign exchange contracts | Model-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross) 1,727,000,000  
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) 1.00%  
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) 28.00%  
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) 13.45%  
Trading account assets and liabilities | Foreign exchange contracts | Internal model
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross)   1,542,000,000
Trading account assets and liabilities | Foreign exchange contracts | Internal model | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent)   0.00%
Foreign exchange (FX) volatility (as a Percent)   3.20%
IR-FX correlation   40.00%
Trading account assets and liabilities | Foreign exchange contracts | Internal model | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent)   3.76%
Foreign exchange (FX) volatility (as a Percent)   67.35%
IR-FX correlation   60.00%
Trading account assets and liabilities | Equity contracts | Price-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross) 563,000,000  
Trading account assets and liabilities | Equity contracts | Price-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity forward 79.10%  
Equity-Equity correlation (81.30%)  
Equity-FX correlation (70.00%)  
Trading account assets and liabilities | Equity contracts | Price-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 118.75  
Equity forward 141.00%  
Equity-Equity correlation 99.40%  
Equity-FX correlation 55.00%  
Trading account assets and liabilities | Equity contracts | Price-based | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 88.10  
Equity forward 100.24%  
Equity-Equity correlation 48.45%  
Equity-FX correlation 0.60%  
Trading account assets and liabilities | Equity contracts | Model-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross) 3,189,000,000  
Trading account assets and liabilities | Equity contracts | Model-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility 10.02%  
Trading account assets and liabilities | Equity contracts | Model-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility 73.48%  
Trading account assets and liabilities | Equity contracts | Model-based | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility 29.87%  
Trading account assets and liabilities | Equity contracts | Internal model
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross)   4,669,000,000
Trading account assets and liabilities | Equity contracts | Internal model | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility   1.00%
Equity forward   74.94%
Equity-Equity correlation   1.00%
Trading account assets and liabilities | Equity contracts | Internal model | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility   185.20%
Equity forward   132.70%
Equity-Equity correlation   99.90%
Trading account assets and liabilities | Commodity contracts | Model-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross) 1,955,000,000  
Trading account assets and liabilities | Commodity contracts | Model-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price 23.00%  
Commodity correlation (75.00%)  
Commodity volatility (as a percent) 4.00%  
Trading account assets and liabilities | Commodity contracts | Model-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price 242.00%  
Commodity correlation 90.00%  
Commodity volatility (as a percent) 146.00%  
Trading account assets and liabilities | Commodity contracts | Model-based | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price 105.00%  
Commodity correlation 32.00%  
Commodity volatility (as a percent) 15.00%  
Trading account assets and liabilities | Commodity contracts | Internal model
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross)   2,160,000,000
Trading account assets and liabilities | Commodity contracts | Internal model | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price   37.45%
Commodity correlation   (77.00%)
Commodity volatility (as a percent)   5.00%
Trading account assets and liabilities | Commodity contracts | Internal model | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price   181.50%
Commodity correlation   95.00%
Commodity volatility (as a percent)   148.00%
Trading account assets and liabilities | Credit derivatives | Price-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross) 1,520,000,000 3,886,000,000
Trading account assets and liabilities | Credit derivatives | Price-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 0.02  
Credit spread (as a percent) 0.03% 0.00%
Recovery rate (as a percent)   6.50%
Credit correlation 5.00% 5.00%
Upfront points 2.31 3.62
Trading account assets and liabilities | Credit derivatives | Price-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 115.20  
Credit spread (as a percent) 13.35% 22.36%
Recovery rate (as a percent)   78.00%
Credit correlation 95.00% 99.00%
Upfront points 100.00 100.00
Trading account assets and liabilities | Credit derivatives | Price-based | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 29.83  
Credit spread (as a percent) 2.03%  
Credit correlation 47.43%  
Upfront points 57.69  
Trading account assets and liabilities | Credit derivatives | Model-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross) 4,767,000,000  
Trading account assets and liabilities | Credit derivatives | Model-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Recovery rate (as a percent) 20.00%  
Trading account assets and liabilities | Credit derivatives | Model-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Recovery rate (as a percent) 64.00%  
Trading account assets and liabilities | Credit derivatives | Model-based | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Recovery rate (as a percent) 38.11%  
Trading account assets and liabilities | Credit derivatives | Internal model
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross)   4,777,000,000
Trading account assets and liabilities | Credit derivatives | Internal model | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   0.00
Trading account assets and liabilities | Credit derivatives | Internal model | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   121.16
Nontrading derivatives and other financial assets and liabilities | Price-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross) 82,000,000  
Nontrading derivatives and other financial assets and liabilities | Price-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
EBITDA multiples 5.20  
Nontrading derivatives and other financial assets and liabilities | Price-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
EBITDA multiples 12.60  
Nontrading derivatives and other financial assets and liabilities | Price-based | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
EBITDA multiples 12.08  
Nontrading derivatives and other financial assets and liabilities | Model-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross) 38,000,000  
Nontrading derivatives and other financial assets and liabilities | Model-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 0.00  
Fund NAV 1.00  
Price-to-book ratio 1.05  
Nontrading derivatives and other financial assets and liabilities | Model-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 105.10  
Discount to price (as a percent) 35.00%  
Fund NAV 10,688,600  
Price-to-book ratio 1.05  
Nontrading derivatives and other financial assets and liabilities | Model-based | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 71.25  
Discount to price (as a percent) 16.36%  
Fund NAV 9,706,488  
Price-to-book ratio 1.05  
Nontrading derivatives and other financial assets and liabilities | Comparables Analysis
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross) 60,000,000  
Nontrading derivatives and other financial assets and liabilities | Comparables Analysis | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price-earnings ratio 6.90  
Nontrading derivatives and other financial assets and liabilities | Comparables Analysis | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price-earnings ratio 6.90  
Nontrading derivatives and other financial assets and liabilities | Comparables Analysis | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price-earnings ratio 6.90  
Nontrading derivatives and other financial assets and liabilities | Internal model
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross)   461,000,000
Nontrading derivatives and other financial assets and liabilities | Internal model | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Redemption rate (as a percent)   30.79%
Nontrading derivatives and other financial assets and liabilities | Internal model | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Redemption rate (as a percent)   99.50%
Nontrading derivatives and other financial assets and liabilities | External model
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross)   2,000,000,000
Nontrading derivatives and other financial assets and liabilities | External model | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   100
Nontrading derivatives and other financial assets and liabilities | External model | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   100
Fixed income instruments
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price input for instrument valued at par $ 100  
Interest-bearing deposits | Model-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of liabilities as of the balance sheet date 890,000,000  
Interest-bearing deposits | Model-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility 14.79%  
Equity-IR correlation 9.00%  
Forward price 23.00%  
Commodity correlation (75.00%)  
Commodity volatility (as a percent) 4.00%  
Mean reversion 1.00%  
Interest-bearing deposits | Model-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility 42.15%  
Equity-IR correlation 20.50%  
Forward price 242.00%  
Commodity correlation 90.00%  
Commodity volatility (as a percent) 146.00%  
Mean reversion 20.00%  
Interest-bearing deposits | Model-based | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility 27.74%  
Equity-IR correlation 19.81%  
Forward price 105.00%  
Commodity correlation 32.00%  
Commodity volatility (as a percent) 15.00%  
Mean reversion 10.50%  
Interest-bearing deposits | Internal model
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of liabilities as of the balance sheet date   785,000,000
Interest-bearing deposits | Internal model | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility   11.13%
Forward price   67.80%
Commodity correlation   (76.00%)
Commodity volatility (as a percent)   5.00%
Interest-bearing deposits | Internal model | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility   86.10%
Forward price   182.00%
Commodity correlation   95.00%
Commodity volatility (as a percent)   148.00%
Federal funds purchased and securities loaned or sold under agreements to repurchase | Model-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of liabilities as of the balance sheet date 902,000,000  
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) 0.47%  
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) 3.66%  
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) 2.71%  
Federal funds purchased and securities loaned or sold under agreements to repurchase | Internal model
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of liabilities as of the balance sheet date   841,000,000
Federal funds purchased and securities loaned or sold under agreements to repurchase | Internal model | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent)   0.33%
Federal funds purchased and securities loaned or sold under agreements to repurchase | Internal model | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent)   4.91%
Trading account liabilities | Securities sold, not yet purchased | Price-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of liabilities as of the balance sheet date 273,000,000 75,000,000
Trading account liabilities | Securities sold, not yet purchased | Price-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit IR correlation (68.00%)  
Trading account liabilities | Securities sold, not yet purchased | Price-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 124.25  
Credit IR correlation 5.00%  
Trading account liabilities | Securities sold, not yet purchased | Price-based | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 99.75  
Credit IR correlation (50.00%)  
Trading account liabilities | Securities sold, not yet purchased | Model-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of liabilities as of the balance sheet date 289,000,000  
Trading account liabilities | Securities sold, not yet purchased | Model-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 1.66%  
Trading account liabilities | Securities sold, not yet purchased | Model-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 1.80%  
Trading account liabilities | Securities sold, not yet purchased | Model-based | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 1.75%  
Trading account liabilities | Securities sold, not yet purchased | Internal model
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of liabilities as of the balance sheet date   265,000,000
Trading account liabilities | Securities sold, not yet purchased | Internal model | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   0.00
Trading account liabilities | Securities sold, not yet purchased | Internal model | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   166.47
Short-term borrowings and long-term debt | Price-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of liabilities as of the balance sheet date 868,000,000 1,112,000,000
Short-term borrowings and long-term debt | Price-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent) 4.00%  
Price 0.63  
Equity volatility 10.70% 12.40%
Equity forward 79.10%  
Equity-Equity correlation (81.30%)  
Equity-FX correlation (70.00%)  
Short-term borrowings and long-term debt | Price-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent) 10.00%  
Price 103.75  
Equity volatility 57.20% 185.20%
Equity forward 141.00%  
Equity-Equity correlation 99.40%  
Equity-FX correlation 55.00%  
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%  
Price 80.73  
Equity volatility 19.41%  
Equity forward 99.51%  
Equity-Equity correlation 48.30%  
Equity-FX correlation 0.60%  
Short-term borrowings and long-term debt | Yield analysis
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of liabilities as of the balance sheet date   649,000,000
Short-term borrowings and long-term debt | Yield analysis | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity forward   75.40%
Equity-Equity correlation   1.00%
Equity-FX correlation   (80.50%)
Short-term borrowings and long-term debt | Yield analysis | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity forward   132.70%
Equity-Equity correlation   99.90%
Equity-FX correlation   50.40%
Short-term borrowings and long-term debt | Model-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of liabilities as of the balance sheet date 5,957,000,000  
Short-term borrowings and long-term debt | Model-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR lognormal volatility 10.60%  
Short-term borrowings and long-term debt | Model-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR lognormal volatility 87.20%  
Short-term borrowings and long-term debt | Model-based | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR lognormal volatility 20.97%  
Short-term borrowings and long-term debt | Internal model
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of liabilities as of the balance sheet date   5,067,000,000
Short-term borrowings and long-term debt | Internal model | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   0.00
Short-term borrowings and long-term debt | Internal model | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   121.16
Federal funds sold and securities borrowed or purchased under agreements to resell | Cash flow
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date   4,786,000,000
Federal funds sold and securities borrowed or purchased under agreements to resell | Cash flow | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent)   1.09%
Federal funds sold and securities borrowed or purchased under agreements to resell | Cash flow | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent)   1.50%
Federal funds sold and securities borrowed or purchased under agreements to resell | Model-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date 3,299,000,000  
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) 1.33%  
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) 2.19%  
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%  
Trading and investment securities | Mortgage-backed securities | Price-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date   4,402,000,000
Trading and investment securities | Mortgage-backed securities | Price-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   135.00
Trading and investment securities | Mortgage-backed securities | Yield analysis
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date   1,148,000,000
Trading and investment securities | Mortgage-backed securities | Yield analysis | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Prepayment period   2 years 1 month 28 days
Trading and investment securities | Mortgage-backed securities | Yield analysis | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent)   25.84%
Prepayment period   7 years 10 months 2 days
Trading and investment securities | State and municipal, foreign government, corporate, and other debt securities | Cash flow
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date   1,231,000,000
Trading and investment securities | State and municipal, foreign government, corporate, and other debt securities | Cash flow | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent)   0.00%
Trading and investment securities | State and municipal, foreign government, corporate, and other debt securities | Cash flow | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent)   30.00%
Trading and investment securities | State and municipal, foreign government, corporate, and other debt securities | Price-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date   4,416,000,000
Trading and investment securities | State and municipal, foreign government, corporate, and other debt securities | Price-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   0.00
Trading and investment securities | State and municipal, foreign government, corporate, and other debt securities | Price-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   159.63
Trading and investment securities | State and municipal, foreign government, corporate, and other debt securities | Yield analysis
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date   787,000,000
Trading and investment securities | State and municipal, foreign government, corporate, and other debt securities | Yield analysis | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent)   0.35%
Trading and investment securities | State and municipal, foreign government, corporate, and other debt securities | Yield analysis | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent)   3.00%
Trading and investment securities | Equity securities | Cash flow
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date   792,000,000
Trading and investment securities | Equity securities | Cash flow | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent)   9.00%
Trading and investment securities | Equity securities | Cash flow | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent)   10.00%
Trading and investment securities | Equity securities | Price-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date   147,000,000
Trading and investment securities | Equity securities | Price-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   0.00
Prepayment period   3 years
Trading and investment securities | Equity securities | Price-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   750.00
Prepayment period   3 years
Trading and investment securities | Asset-backed securities | Cash flow
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date   561,000,000
Trading and investment securities | Asset-backed securities | Cash flow | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
WAL   4 months 2 days
Credit correlation   15.00%
Trading and investment securities | Asset-backed securities | Cash flow | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
WAL   16 years 25 days
Credit correlation   90.00%
Trading and investment securities | Asset-backed securities | Price-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date   4,253,000,000
Trading and investment securities | Asset-backed securities | Price-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   137
Trading and investment securities | Asset-backed securities | Internal model
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date   1,775,000,000
Trading and investment securities | Asset-backed securities | Internal model | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent)   27.00%
Trading and investment securities | Non-marketable equity securities | Cash flow
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date   709,000,000
Trading and investment securities | Non-marketable equity securities | Cash flow | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Discount to price (as a percent)   75.00%
Trading and investment securities | Non-marketable equity securities | Price-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date   2,768,000,000
Trading and investment securities | Non-marketable equity securities | Price-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fund NAV   1.00
Trading and investment securities | Non-marketable equity securities | Price-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fund NAV   456,773,838
Trading and investment securities | Non-marketable equity securities | Comparables Analysis
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date   1,803,000,000
Trading and investment securities | Non-marketable equity securities | Comparables Analysis | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
EBITDA multiples   4.70
Price-to-book ratio   0.77
Trading and investment securities | Non-marketable equity securities | Comparables Analysis | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
EBITDA multiples   14.39
Price-to-book ratio   1.50
Loans | Price-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date 2,153,000,000 2,447,000,000
Loans | Price-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   0.00
Loans | Price-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 103.75 103.32
Loans | Price-based | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 91.19  
Loans | Yield analysis
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date 549,000,000 1,423,000,000
Loans | Yield analysis | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 0.49% 0.55%
Loans | Yield analysis | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 16.00% 6.0019%
Loans | Yield analysis | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 3.02%  
Loans | Model-based
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date 1,422,000,000  
Loans | Model-based | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 1.60%  
Loans | Model-based | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 4.50%  
Loans | Model-based | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 2.10%  
Loans | Internal model
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date   888,000,000
Mortgage servicing rights | Cash flow
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value of assets as of the balance sheet date $ 2,625,000,000 $ 1,858,000,000
Mortgage servicing rights | Cash flow | Minimum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 3.64%  
WAL 2 years 3 months 7 days  
Prepayment period   2 years 1 month 28 days
Mortgage servicing rights | Cash flow | Maximum
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 12.00% 53.19%
WAL 9 years 5 months 8 days  
Prepayment period   7 years 10 months 2 days
Mortgage servicing rights | Cash flow | Weighted Average
    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 7.19%  
WAL 6 years 1 month 13 days