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FAIR VALUE MEASUREMENT - Valuation Techniques and Inputs for Level 3 Fair Value Measurements (Details) - Level 3 - USD ($)
 9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Interest-bearing deposits | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total Liabilities $ 260,000,000 $ 434,000,000
Interest-bearing deposits | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mean reversion (as a percent) 1.00%  
Forward price (as a percent)   35.09%
Commodity volatility (as a percent)   5.00%
Commodity correlation (as a percent)   (57.00%)
Equity-IR correlation (as a percent)   23.00%
Interest-bearing deposits | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mean reversion (as a percent) 20.00%  
Forward price (as a percent)   299.32%
Commodity volatility (as a percent)   83.00%
Commodity correlation (as a percent)   91.00%
Equity-IR correlation (as a percent)   39.00%
Interest-bearing deposits | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mean reversion (as a percent) 10.50%  
Forward price (as a percent)   112.72%
Commodity volatility (as a percent)   24.00%
Commodity correlation (as a percent)   30.00%
Equity-IR correlation (as a percent)   34.51%
Federal funds purchased and securities loaned or sold under agreements to repurchase | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total Liabilities $ 923,000,000 $ 1,245,000,000
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) 0.15% 1.27%
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) 1.40% 2.02%
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) 1.11% 1.92%
Short-term borrowings and long-term debt | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total Liabilities $ 9,241,000,000 $ 7,004,000,000
Short-term borrowings and long-term debt | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mean reversion (as a percent) 1.00% (5.52%)
Equity volatility (as a percent) 7.55% 9.55%
Equity-FX correlation (as a percent)   (88.20%)
Equity forward (as a percent)   82.72%
Equity-equity correlation   (80.54%)
Forward price (as a percent) 88.11% 35.09%
Commodity volatility (as a percent) 2.00%  
Commodity correlation (as a percent) (43.68%)  
Short-term borrowings and long-term debt | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mean reversion (as a percent) 20.00% 20.00%
Equity volatility (as a percent) 41.94% 42.56%
Equity-FX correlation (as a percent)   56.85%
Equity forward (as a percent)   100.80%
Equity-equity correlation   100.00%
Forward price (as a percent) 198.89% 299.32%
Commodity volatility (as a percent) 49.32%  
Commodity correlation (as a percent) 92.17%  
Short-term borrowings and long-term debt | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mean reversion (as a percent) 10.49% 7.80%
Equity volatility (as a percent) 19.85% 22.26%
Equity-FX correlation (as a percent)   (31.76%)
Equity forward (as a percent)   94.48%
Equity-equity correlation   49.16%
Forward price (as a percent) 113.04% 106.32%
Commodity volatility (as a percent) 21.38%  
Commodity correlation (as a percent) 20.00%  
Trading account assets and liabilities | Interest rate contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 7,228,000,000 $ 4,553,000,000
Trading account assets and liabilities | Interest rate contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR lognormal volatility (as a percent) 15.10% 17.41%
Mean reversion (as a percent) 1.00% (5.52%)
Trading account assets and liabilities | Interest rate contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR lognormal volatility (as a percent) 75.30% 137.02%
Mean reversion (as a percent) 20.00% 20.00%
Trading account assets and liabilities | Interest rate contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR lognormal volatility (as a percent) 56.39% 37.60%
Mean reversion (as a percent) 10.50% 0.71%
Trading account assets and liabilities | Foreign exchange contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 1,237,000,000 $ 1,326,000,000
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) 3.61% 0.38%
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) 25.47% 25.73%
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) 9.84% 11.63%
Trading account assets and liabilities | Foreign exchange contracts | Cash flow    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 174,000,000 $ 275,000,000
Trading account assets and liabilities | Foreign exchange contracts | Cash flow | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent)   7.50%
Credit spread (as a percent) 0.15% 0.03%
IR-IR correlation (as a percent) 40.00% (51.00%)
IR-FX correlation (as a percent) 40.00% (20.30%)
Forward price (as a percent)   1.48%
Trading account assets and liabilities | Foreign exchange contracts | Cash flow | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent)   7.50%
Credit spread (as a percent) 5.37% 5.15%
IR-IR correlation (as a percent) 40.00% 77.94%
IR-FX correlation (as a percent) 60.00% 60.00%
Forward price (as a percent)   138.09%
Trading account assets and liabilities | Foreign exchange contracts | Cash flow | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent)   7.50%
Credit spread (as a percent) 1.79% 2.35%
IR-IR correlation (as a percent) 40.00% 32.91%
IR-FX correlation (as a percent) 50.00% 48.85%
Forward price (as a percent)   56.80%
Trading account assets and liabilities | Equity contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 3,562,000,000 $ 3,976,000,000
Trading account assets and liabilities | Equity contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
WAL (in years) 4 years  
Equity volatility (as a percent) 0.37% 11.87%
Equity-FX correlation (as a percent)   (88.17%)
Equity forward (as a percent) 66.94% 82.72%
Equity-equity correlation   (80.54%)
Forward price (as a percent) 22.38%  
Equity-IR correlation (as a percent) (35.00%)  
Trading account assets and liabilities | Equity contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
WAL (in years) 4 years  
Equity volatility (as a percent) 59.43% 49.57%
Equity-FX correlation (as a percent)   65.00%
Equity forward (as a percent) 111.91% 100.53%
Equity-equity correlation   100.00%
Forward price (as a percent) 104.46%  
Equity-IR correlation (as a percent) 71.00%  
Trading account assets and liabilities | Equity contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
WAL (in years) 4 years  
Equity volatility (as a percent) 18.82% 27.33%
Equity-FX correlation (as a percent)   (21.09%)
Equity forward (as a percent) 90.91% 95.20%
Equity-equity correlation   49.54%
Forward price (as a percent) 98.37%  
Equity-IR correlation (as a percent) (11.50%)  
Trading account assets and liabilities | Commodity contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 3,499,000,000 $ 4,061,000,000
Trading account assets and liabilities | Commodity contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent) 42.00% 35.09%
Commodity volatility (as a percent) 2.00% 5.00%
Commodity correlation (as a percent) (43.68%) (57.00%)
Trading account assets and liabilities | Commodity contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent) 387.95% 299.32%
Commodity volatility (as a percent) 49.32% 83.00%
Commodity correlation (as a percent) 92.17% 91.00%
Trading account assets and liabilities | Commodity contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent) 133.57% 112.98%
Commodity volatility (as a percent) 21.38% 24.00%
Commodity correlation (as a percent) 20.00% 30.00%
Trading account assets and liabilities | Credit derivatives | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 3,482,000,000 $ 5,849,000,000
Trading account assets and liabilities | Credit derivatives | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Recovery rate (as a percent) 15.27% 1.00%
Trading account assets and liabilities | Credit derivatives | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Recovery rate (as a percent) 75.00% 75.00%
Trading account assets and liabilities | Credit derivatives | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Recovery rate (as a percent) 37.56% 32.49%
Trading account assets and liabilities | Credit derivatives | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 1,449,000,000 $ 1,424,000,000
Trading account assets and liabilities | Credit derivatives | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price $ 1.00 $ 0.33
Credit spread (as a percent) 0.05% 0.01%
Credit correlation (as a percent) 5.00% 5.00%
Upfront points 10.11% 7.00%
Trading account assets and liabilities | Credit derivatives | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price $ 621.00 $ 101.00
Credit spread (as a percent) 16.13% 9.67%
Credit correlation (as a percent) 65.00% 90.00%
Upfront points 99.95% 99.92%
Trading account assets and liabilities | Credit derivatives | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price $ 86.26 $ 61.52
Credit spread (as a percent) 2.85% 1.33%
Credit correlation (as a percent) 35.53% 43.48%
Upfront points 67.49% 66.75%
Nontrading derivatives and other financial assets and liabilities | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 99,000,000 $ 194,000,000
Nontrading derivatives and other financial assets and liabilities | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent) 0.36% 5.26%
Recovery rate (as a percent)   7.00%
Redemption rate (as a percent) 5.05% 27.00%
Nontrading derivatives and other financial assets and liabilities | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent) 0.38% 5.28%
Recovery rate (as a percent)   40.00%
Redemption rate (as a percent) 99.50% 99.50%
Nontrading derivatives and other financial assets and liabilities | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent) 0.37% 5.27%
Recovery rate (as a percent)   10.72%
Redemption rate (as a percent) 73.31% 74.80%
Securities sold, not yet purchased | Trading account liabilities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total Liabilities $ 195,000,000 $ 152,000,000
Securities sold, not yet purchased | Trading account liabilities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price $ 0.00 0.00
Forward price (as a percent) 42.00%  
Commodity volatility (as a percent) 2.00%  
Commodity correlation (as a percent) (43.68%)  
Securities sold, not yet purchased | Trading account liabilities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price $ 621.00 217.00
Forward price (as a percent) 387.95%  
Commodity volatility (as a percent) 49.32%  
Commodity correlation (as a percent) 92.17%  
Securities sold, not yet purchased | Trading account liabilities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price $ 86.97 87.78
Forward price (as a percent) 131.84%  
Commodity volatility (as a percent) 21.30%  
Commodity correlation (as a percent) 20.00%  
Mortgage-backed securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 659,000,000 1,287,000,000
Mortgage-backed securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 6.65 3.45
Mortgage-backed securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 118.45 109.21
Mortgage-backed securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 75.90 78.25
Mortgage-backed securities | Yield analysis    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 547,000,000 $ 1,377,000,000
Mortgage-backed securities | Yield analysis | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 0.11% 0.50%
Mortgage-backed securities | Yield analysis | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 16.08% 14.07%
Mortgage-backed securities | Yield analysis | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 4.19% 4.83%
State and municipal, foreign government, corporate, and other debt securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 3,595,000,000 $ 3,761,000,000
State and municipal, foreign government, corporate, and other debt securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 7.00 0.00
State and municipal, foreign government, corporate, and other debt securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 106.00 217.00
State and municipal, foreign government, corporate, and other debt securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 93.73 79.41
State and municipal, foreign government, corporate, and other debt securities | Cash flow    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 1,699,000,000 $ 1,719,000,000
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) 0.35% 0.20%
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) 6.00% 6.00%
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) 2.28% 2.51%
Equity securities | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 3,404,000,000 $ 3,499,000,000
Equity securities | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
WAL (in years) 4 years 1 year 6 months
Redemption rate (as a percent)   41.21%
Equity securities | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
WAL (in years) 4 years 1 year 6 months
Redemption rate (as a percent)   41.21%
Equity securities | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
WAL (in years) 4 years 1 year 6 months
Redemption rate (as a percent)   41.21%
Asset-backed securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 3,285,000,000 $ 3,075,000,000
Asset-backed securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 6.25 5.55
Asset-backed securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 100.00 100.21
Asset-backed securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 73.98 71.57
Non-marketable equity securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets 539,000,000 473,000,000
Non-marketable equity securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price $ 0.00 $ 0.00
Discount to price (as a percent) 0.00% 0.00%
Price-to-book ratio 0.0032 0.19
Non-marketable equity securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price $ 113.23 $ 132.78
Discount to price (as a percent) 73.80% 90.00%
Price-to-book ratio 0.0210 1.09
Non-marketable equity securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price $ 39.02 $ 46.66
Discount to price (as a percent) 11.23% 10.89%
Price-to-book ratio 0.0111 0.60
Non-marketable equity securities | Comparables Analysis    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 603,000,000 $ 633,000,000
Non-marketable equity securities | Comparables Analysis | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
EBITDA multiples 7.00 6.8
Non-marketable equity securities | Comparables Analysis | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
EBITDA multiples 10.40 10.8
Non-marketable equity securities | Comparables Analysis | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
EBITDA multiples 8.66 9.05
Federal funds sold and securities borrowed or purchased under agreements to resell | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 1,313,000,000 $ 1,337,000,000
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) (0.47%) 0.00%
IR lognormal volatility (as a percent) 32.32% 29.02%
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) 1.40% 2.03%
IR lognormal volatility (as a percent) 80.41% 137.02%
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) (0.39%) 0.27%
IR lognormal volatility (as a percent) 68.61% 37.90%
Loans | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 455,000,000 $ 892,000,000
Loans | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 0.00 0.00
Loans | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 111.68 106.98
Loans | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 11.12 40.69
Loans | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 395,000,000 $ 750,000,000
Loans | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent)   1.50%
Credit spread (as a percent) 0.04%  
Loans | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent)   4.50%
Credit spread (as a percent) 5.00%  
Loans | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent)   2.52%
Credit spread (as a percent) 0.76%  
Loans | Yield analysis | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 222,000,000  
Yield (as a percent) 1.75%  
Loans | Yield analysis | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 4.40%  
Loans | Yield analysis | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 2.92%  
Loans | Cash flow    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets   $ 524,000,000
Loans | Cash flow | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent)   0.29%
Loans | Cash flow | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent)   5.00%
Loans | Cash flow | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent)   1.05%
MSRs | Cash flow    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 1,178,000,000 $ 1,690,000,000
MSRs | Cash flow | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 1.62% 0.00%
WAL (in years) 3 years 2 months 1 day 3 years 4 months 17 days
MSRs | Cash flow | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 18.52% 23.32%
WAL (in years) 6 years 26 days 7 years 5 months 23 days
MSRs | Cash flow | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 8.64% 6.83%
WAL (in years) 4 years 9 months 7 days 5 years 6 months