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FAIR VALUE MEASUREMENT - Valuation Techniques and Inputs for Level 3 Fair Value Measurements (Details) - Level 3 - USD ($)
 3 Months Ended 12 Months Ended
Mar. 31, 2018
Dec. 31, 2017
Interest-bearing deposits | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total Liabilities $ 292,000,000 $ 286,000,000
Interest-bearing deposits | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mean reversion (as a percent) 0.00% 1.00%
Forward price (as a percent)   99.56%
Interest-bearing deposits | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mean reversion (as a percent) 20.00% 20.00%
Forward price (as a percent)   99.95%
Interest-bearing deposits | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mean reversion (as a percent) 7.85% 10.50%
Forward price (as a percent)   99.72%
Federal funds purchased and securities loaned or sold under agreement to repurchase | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total Liabilities $ 857,000,000 $ 726,000,000
Federal funds purchased and securities loaned or sold under agreement to repurchase | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent) 1.74% 1.43%
Federal funds purchased and securities loaned or sold under agreement to repurchase | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent) 2.41% 2.16%
Federal funds purchased and securities loaned or sold under agreement to repurchase | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent) 2.40% 2.09%
Short-term borrowings and long-term debt | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total Liabilities $ 13,559,000,000 $ 13,100,000,000
Short-term borrowings and long-term debt | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility (as a percent) 3.00%  
Forward price (as a percent) 63.73% 69.74%
Short-term borrowings and long-term debt | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility (as a percent) 70.22%  
Forward price (as a percent) 167.94% 161.11%
Short-term borrowings and long-term debt | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility (as a percent) 18.48%  
Forward price (as a percent) 103.12% 100.70%
Trading account assets and liabilities | Interest rate contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 4,440,000,000 $ 3,818,000,000
Trading account assets and liabilities | Interest rate contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mean reversion (as a percent) 1.00% 1.00%
Inflation volatility 0.25%  
IR normal volatility (as a percent) 0.12% 9.40%
Trading account assets and liabilities | Interest rate contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mean reversion (as a percent) 20.00% 20.00%
Inflation volatility 2.70%  
IR normal volatility (as a percent) 78.91% 77.40%
Trading account assets and liabilities | Interest rate contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mean reversion (as a percent) 10.50% 10.50%
Inflation volatility 0.82%  
IR normal volatility (as a percent) 50.71% 58.86%
Trading account assets and liabilities | Foreign exchange contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 877,000,000 $ 940,000,000
Trading account assets and liabilities | Foreign exchange contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent)   (0.55%)
Credit spread (as a percent) 0.23% 0.11%
FX Volatility (as a percent) 6.41% 4.58%
IR Basis (as a percent) (0.74%)  
IR-IR correlation (as a percent) 40.00% (51.00%)
IR-FX Correlation (as a percent) 40.00% (7.34%)
Trading account assets and liabilities | Foreign exchange contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent)   0.28%
Credit spread (as a percent) 78.23% 7.17%
FX Volatility (as a percent) 20.25% 15.02%
IR Basis (as a percent) 2.01%  
IR-IR correlation (as a percent) 40.00% 40.00%
IR-FX Correlation (as a percent) 60.00% 60.00%
Trading account assets and liabilities | Foreign exchange contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent)   0.04%
Credit spread (as a percent) 1.66% 1.73%
FX Volatility (as a percent) 12.75% 8.16%
IR Basis (as a percent) (0.01%)  
IR-IR correlation (as a percent) 40.00% 36.56%
IR-FX Correlation (as a percent) 50.00% 49.04%
Trading account assets and liabilities | Equity contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 2,835,000,000 $ 2,897,000,000
Trading account assets and liabilities | Equity contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility (as a percent) 1.16% 3.00%
Forward price (as a percent) 63.73% 69.74%
Trading account assets and liabilities | Equity contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility (as a percent) 70.22% 68.93%
Forward price (as a percent) 153.71% 154.19%
Trading account assets and liabilities | Equity contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility (as a percent) 25.72% 24.66%
Forward price (as a percent) 101.21% 92.80%
Trading account assets and liabilities | Commodity contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 2,940,000,000 $ 2,937,000,000
Trading account assets and liabilities | Commodity contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent) 35.75% 3.66%
Commodity volatility (as a percent) 9.14% 8.60%
Commodity correlation (as a percent) (51.36%) (37.64%)
Trading account assets and liabilities | Commodity contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent) 478.26% 290.59%
Commodity volatility (as a percent) 41.03% 66.73%
Commodity correlation (as a percent) 91.85% 91.71%
Trading account assets and liabilities | Commodity contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent) 114.73% 114.16%
Commodity volatility (as a percent) 22.87% 25.04%
Commodity correlation (as a percent) 19.83% 15.21%
Trading account assets and liabilities | Credit derivatives | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 1,833,000,000 $ 1,797,000,000
Trading account assets and liabilities | Credit derivatives | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit correlation (as a percent) 25.00% 25.00%
Trading account assets and liabilities | Credit derivatives | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit correlation (as a percent) 85.00% 90.00%
Trading account assets and liabilities | Credit derivatives | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit correlation (as a percent) 43.30% 44.64%
Trading account assets and liabilities | Credit derivatives | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 774,000,000 $ 823,000,000
Trading account assets and liabilities | Credit derivatives | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset $ 7.54  
Credit spread (as a percent) 0.06% 0.03%
Upfront points (as a percent) 3.84% 6.03%
Price   $ 1.00
Trading account assets and liabilities | Credit derivatives | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset $ 100.00  
Credit spread (as a percent) 12.00% 16.36%
Upfront points (as a percent) 97.33% 97.26%
Price   $ 100.24
Trading account assets and liabilities | Credit derivatives | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset $ 64.58  
Credit spread (as a percent) 1.15% 1.73%
Upfront points (as a percent) 59.81% 62.88%
Price   $ 57.63
Nontrading derivatives and other financial assets and liabilities | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 19,000,000 $ 24,000,000
Nontrading derivatives and other financial assets and liabilities | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 0.21% 0.38%
Upfront points (as a percent) 54.00% 61.00%
Recovery rate (as a percent) 25.00% 25.00%
Redemption rate 5.14% 10.72%
Nontrading derivatives and other financial assets and liabilities | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 1.29% 2.75%
Upfront points (as a percent) 54.00% 61.00%
Recovery rate (as a percent) 46.00% 40.00%
Redemption rate 99.50% 99.50%
Nontrading derivatives and other financial assets and liabilities | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 0.77% 1.27%
Upfront points (as a percent) 54.00% 61.00%
Recovery rate (as a percent) 38.21% 31.56%
Redemption rate 72.69% 74.24%
Securities sold, not yet purchased | Trading account liabilities | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total Liabilities $ 31,000,000  
Securities sold, not yet purchased | Trading account liabilities | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility (as a percent) 3.00%  
Securities sold, not yet purchased | Trading account liabilities | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility (as a percent) 70.22%  
Securities sold, not yet purchased | Trading account liabilities | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility (as a percent) 31.84%  
Securities sold, not yet purchased | Trading account liabilities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total Liabilities $ 18,000,000 $ 21,000,000
Securities sold, not yet purchased | Trading account liabilities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent) 63.73%  
Equity-equity correlation (99.00%)  
Equity-FX correlation (80.37%)  
Price, liability $ 0.00 1.00
Securities sold, not yet purchased | Trading account liabilities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent) 153.71%  
Equity-equity correlation 100.00%  
Equity-FX correlation 56.00%  
Price, liability $ 100.00 287.64
Securities sold, not yet purchased | Trading account liabilities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent) 100.14%  
Equity-equity correlation 59.65%  
Equity-FX correlation (29.86%)  
Price, liability $ 24.84 88.19
Mortgage-backed securities | Yield analysis    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 220,000,000 $ 184,000,000
Mortgage-backed securities | Yield analysis | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 2.18% 2.52%
Mortgage-backed securities | Yield analysis | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 8.14% 14.06%
Mortgage-backed securities | Yield analysis | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 3.89% 5.97%
Mortgage-backed securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 147,000,000 $ 214,000,000
Mortgage-backed securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 6.00 2.96
Mortgage-backed securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 102.26 101.00
Mortgage-backed securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 74.57 56.52
Debt securities | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets 943,000,000 949,000,000
Debt securities | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 3.47 0.00
Debt securities | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 110.39 184.04
Debt securities | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 88.85 91.74
Debt securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets   $ 914,000,000
Debt securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent)   2.36%
Credit spread (as a percent)   0.35%
Debt securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent)   14.25%
Credit spread (as a percent)   5.00%
Debt securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent)   6.03%
Credit spread (as a percent)   2.49%
Non-mortgage debt securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 883,000,000  
Non-mortgage debt securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 2.00%  
Credit spread (as a percent) 0.35%  
Non-mortgage debt securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 14.88%  
Credit spread (as a percent) 5.00%  
Non-mortgage debt securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 6.54%  
Credit spread (as a percent) 2.52%  
Equity securities | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 30,000,000 $ 55,000,000
Equity securities | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
WAL (in years)   2 years 6 months
Equity securities | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
WAL (in years)   2 years 6 months
Equity securities | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
WAL (in years)   2 years 6 months
Equity securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets 206,000,000 $ 65,000,000
Equity securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 0.01 0.00
Equity securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 18,320.07 25,450.00
Equity securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 654.81 2,526.62
Asset-backed securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets 1,983,000,000 2,287,000,000
Asset-backed securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 2.33 4.25
Asset-backed securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 100.76 100.60
Asset-backed securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 69.28 74.57
Non-marketable equity investments measured using the measurement alternative | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 265,000,000 $ 223,000,000
Non-marketable equity investments measured using the measurement alternative | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Discount to price 0.00% 0.00%
Price-to-book ratio 5.00 0.05
Non-marketable equity investments measured using the measurement alternative | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Discount to price 100.00% 100.00%
Price-to-book ratio 100.00 1.00
Non-marketable equity investments measured using the measurement alternative | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Discount to price 13.24% 11.83%
Price-to-book ratio 68.86 0.32
Non-marketable equity investments measured using the measurement alternative | Comparable analysis    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 431,000,000 $ 423,000,000
Non-marketable equity investments measured using the measurement alternative | Comparable analysis | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
EBITDA multiples 7 6.90
Non-marketable equity investments measured using the measurement alternative | Comparable analysis | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
EBITDA multiples 10.9 12.80
Non-marketable equity investments measured using the measurement alternative | Comparable analysis | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
EBITDA multiples 8.56 8.66
Federal funds sold and securities borrowed or purchased under agreements to resell | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 16,000,000 $ 16,000,000
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) 1.74% 1.43%
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) 2.41% 2.16%
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) 2.40% 2.09%
Loans and leases | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 520,000,000  
Loans and leases | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 2.70%  
Credit spread (as a percent) 0.17%  
Loans and leases | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 4.06%  
Credit spread (as a percent) 5.00%  
Loans and leases | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 3.71%  
Credit spread (as a percent) 0.92%  
Mortgage servicing rights | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 87,000,000 $ 87,000,000
Mortgage servicing rights | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
WAL (in years) 4 years 29 days 3 years 9 months 29 days
Mortgage servicing rights | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
WAL (in years) 7 years 7 months 17 days 6 years 10 months 21 days
Mortgage servicing rights | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
WAL (in years) 6 years 6 months 11 days 5 years 11 months 5 days
Mortgage servicing rights | Cash flow    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 500,000,000 $ 471,000,000
Mortgage servicing rights | Cash flow | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 4.26% 8.00%
Mortgage servicing rights | Cash flow | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 12.60% 16.38%
Mortgage servicing rights | Cash flow | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 8.36% 11.47%
Loans | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets   $ 391,000,000
Loans | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility (as a percent)   3.00%
Loans | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility (as a percent)   68.93%
Loans | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility (as a percent)   22.52%
Loans | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets   $ 148,000,000
Loans | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent)   3.09%
Credit spread (as a percent)   1.34%
Loans | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent)   4.40%
Credit spread (as a percent)   5.00%
Loans | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent)   3.13%
Credit spread (as a percent)   1.73%