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FAIR VALUE MEASUREMENT - Valuation Techniques and Inputs for Level 3 Fair Value Measurements (Details) - Level 3 - USD ($)
 6 Months Ended 12 Months Ended
Jun. 30, 2017
Dec. 31, 2016
Interest-bearing deposits | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total Liabilities $ 300,000,000 $ 293,000,000
Interest-bearing deposits | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent)   98.79%
Mean reversion (as a percent) 1.00% 1.00%
Yield volatility (as a percent) 3.64%  
Equity-IR correlation (as a percent) 27.00%  
Interest-bearing deposits | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent)   104.07%
Mean reversion (as a percent) 20.00% 20.00%
Yield volatility (as a percent) 9.31%  
Equity-IR correlation (as a percent) 41.00%  
Interest-bearing deposits | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent)   100.19%
Mean reversion (as a percent) 10.50% 10.50%
Yield volatility (as a percent) 7.46%  
Equity-IR correlation (as a percent) 31.44%  
Federal funds purchased and securities loaned or sold under agreements to repurchase | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total Liabilities $ 807,000,000 $ 849,000,000
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) 0.93% 0.62%
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) 2.22% 2.19%
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) 2.00% 1.99%
Short-term borrowings and long-term debt | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total Liabilities $ 11,856,000,000 $ 9,774,000,000
Short-term borrowings and long-term debt | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR normal volatility (as a percent) 15.32%  
Forward price (as a percent) 28.61% 69.05%
Equity volatility (as a percent) 3.00%  
Mean reversion (as a percent) 1.00% 1.00%
Commodity volatility (as a percent)   2.00%
Commodity correlation (as a percent)   (41.61%)
Short-term borrowings and long-term debt | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR normal volatility (as a percent) 80.07%  
Forward price (as a percent) 196.94% 235.35%
Equity volatility (as a percent) 47.73%  
Mean reversion (as a percent) 20.00% 20.00%
Commodity volatility (as a percent)   32.19%
Commodity correlation (as a percent)   90.42%
Short-term borrowings and long-term debt | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR normal volatility (as a percent) 62.20%  
Forward price (as a percent) 99.83% 103.28%
Equity volatility (as a percent) 23.47%  
Mean reversion (as a percent) 10.50% 10.50%
Commodity volatility (as a percent)   17.07%
Commodity correlation (as a percent)   52.85%
Trading account assets and liabilities | Interest rate contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 3,579,000,000 $ 4,897,000,000
Trading account assets and liabilities | Interest rate contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR normal volatility (as a percent) 0.11%  
Mean reversion (as a percent) 1.00% 1.00%
IR log-normal volatility   1.00%
Trading account assets and liabilities | Interest rate contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR normal volatility (as a percent) 67.64%  
Mean reversion (as a percent) 20.00% 20.00%
IR log-normal volatility   93.97%
Trading account assets and liabilities | Interest rate contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR normal volatility (as a percent) 55.31%  
Mean reversion (as a percent) 10.50% 10.50%
IR log-normal volatility   62.72%
Trading account assets and liabilities | Foreign exchange contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 894,000,000 $ 1,110,000,000
Trading account assets and liabilities | Foreign exchange contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 5.62%  
FX Volatility (as a percent)   1.39%
Trading account assets and liabilities | Foreign exchange contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 14.50%  
FX Volatility (as a percent)   26.85%
Trading account assets and liabilities | Foreign exchange contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 9.30%  
FX Volatility (as a percent)   15.18%
Trading account assets and liabilities | Foreign exchange contracts | Cash flow    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 96,000,000 $ 134,000,000
Trading account assets and liabilities | Foreign exchange contracts | Cash flow | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 0.22% 0.04%
FX Volatility (as a percent) 2.99%  
IR Basis (as a percent)   (0.85%)
IR-FX correlation (as a percent) (4.01%) 16.41%
IR-IR correlation (as a percent) (7.79%) 40.00%
Trading account assets and liabilities | Foreign exchange contracts | Cash flow | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 4.81% 6.57%
FX Volatility (as a percent) 24.51%  
IR Basis (as a percent)   (0.49%)
IR-FX correlation (as a percent) 60.00% 60.00%
IR-IR correlation (as a percent) 69.65% 50.00%
Trading account assets and liabilities | Foreign exchange contracts | Cash flow | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 2.04% 2.66%
FX Volatility (as a percent) 12.77%  
IR Basis (as a percent)   (0.84%)
IR-FX correlation (as a percent) 49.09% 49.52%
IR-IR correlation (as a percent) 39.74% 41.27%
Trading account assets and liabilities | Equity contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 2,946,000,000 $ 2,701,000,000
Trading account assets and liabilities | Equity contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent) 51.91% 69.05%
Equity volatility (as a percent) 3.00% 3.00%
Equity-equity correlation (88.92%) (87.70%)
Yield volatility (as a percent) 3.25% 3.55%
Equity-FX correlation   (60.70%)
Equity-IR correlation (as a percent) (35.00%) (35.00%)
Trading account assets and liabilities | Equity contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent) 134.52% 144.61%
Equity volatility (as a percent) 54.46% 97.78%
Equity-equity correlation 92.42% 96.50%
Yield volatility (as a percent) 12.68% 14.77%
Equity-FX correlation   28.20%
Equity-IR correlation (as a percent) 41.00% 41.00%
Trading account assets and liabilities | Equity contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent) 95.49% 94.28%
Equity volatility (as a percent) 24.65% 29.52%
Equity-equity correlation 69.78% 67.45%
Yield volatility (as a percent) 6.41% 9.29%
Equity-FX correlation   (26.28%)
Equity-IR correlation (as a percent) 33.25% (15.65%)
Trading account assets and liabilities | Commodity contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 3,024,000,000 $ 2,955,000,000
Trading account assets and liabilities | Commodity contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent) 28.61% 35.74%
Commodity volatility (as a percent)   2.00%
Commodity correlation (as a percent)   (41.61%)
Trading account assets and liabilities | Commodity contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent) 303.76% 235.35%
Commodity volatility (as a percent)   32.19%
Commodity correlation (as a percent)   90.42%
Trading account assets and liabilities | Commodity contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent) 112.86% 119.99%
Commodity volatility (as a percent)   17.07%
Commodity correlation (as a percent)   52.85%
Trading account assets and liabilities | Credit derivatives | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 2,840,000,000 $ 2,786,000,000
Trading account assets and liabilities | Credit derivatives | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Recovery rate (as a percent) 6.50% 20.00%
Trading account assets and liabilities | Credit derivatives | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Recovery rate (as a percent) 65.00% 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) 34.50% 39.75%
Trading account assets and liabilities | Credit derivatives | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 1,384,000,000 $ 1,403,000,000
Trading account assets and liabilities | Credit derivatives | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset $ 0.01 $ 1.00
Credit spread (as a percent) 0.05% 0.03%
Credit correlation (as a percent) 5.00% 5.00%
Upfront points (as a percent) 5.00%  
Upfront points   $ 0.0600
Trading account assets and liabilities | Credit derivatives | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset $ 239.25 $ 167.00
Credit spread (as a percent) 1.0381% 15.15%
Credit correlation (as a percent) 95.00% 90.00%
Upfront points (as a percent) 98.97%  
Upfront points   $ 0.9990
Trading account assets and liabilities | Credit derivatives | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset $ 81.58 $ 77.35
Credit spread (as a percent) 4.01% 2.56%
Credit correlation (as a percent) 35.11% 34.27%
Upfront points (as a percent) 57.17%  
Upfront points   $ 0.7289
Nontrading derivatives and other financial assets and liabilities | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives (gross) $ 18,000,000 $ 42,000,000
Nontrading derivatives and other financial assets and liabilities | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Recovery rate (as a percent) 40.00% 40.00%
Upfront points (as a percent)   16.00%
Redemption rate (as a percent) 13.22% 3.92%
Nontrading derivatives and other financial assets and liabilities | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Recovery rate (as a percent) 40.00% 40.00%
Upfront points (as a percent)   20.50%
Redemption rate (as a percent) 99.50% 99.58%
Nontrading derivatives and other financial assets and liabilities | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Recovery rate (as a percent) 40.00% 40.00%
Upfront points (as a percent)   18.78%
Redemption rate (as a percent) 73.22% 74.69%
Securities sold, not yet purchased | Trading account liabilities | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total Liabilities $ 1,105,000,000 $ 1,056,000,000
Securities sold, not yet purchased | Trading account liabilities | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR normal volatility (as a percent) 24.54% 12.86%
Securities sold, not yet purchased | Trading account liabilities | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR normal volatility (as a percent) 80.07% 75.50%
Securities sold, not yet purchased | Trading account liabilities | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR normal volatility (as a percent) 66.85% 61.73%
Mortgage-backed securities | Yield analysis    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 496,000,000 $ 368,000,000
Mortgage-backed securities | Yield analysis | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 0.88% 1.90%
Mortgage-backed securities | Yield analysis | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 11.81% 14.54%
Mortgage-backed securities | Yield analysis | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 4.13% 4.34%
Mortgage-backed securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 402,000,000 $ 509,000,000
Mortgage-backed securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 6.02 5.50
Mortgage-backed securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 105.10 113.48
Mortgage-backed securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 70.52 61.74
State and municipal, foreign government, corporate, and other debt securities | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 1,725,000,000  
State and municipal, foreign government, corporate, and other debt securities | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 0.35%  
State and municipal, foreign government, corporate, and other debt securities | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 6.00%  
State and municipal, foreign government, corporate, and other debt securities | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 2.42%  
State and municipal, foreign government, corporate, and other debt securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 2,417,000,000 3,308,000,000
State and municipal, foreign government, corporate, and other debt securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 15.00 15.00
State and municipal, foreign government, corporate, and other debt securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 118.96 103.60
State and municipal, foreign government, corporate, and other debt securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 94.36 89.93
State and municipal, foreign government, corporate, and other debt securities | Cash flow    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets   $ 1,513,000,000
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%
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%
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)   2.30%
Equity securities | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets 119,000,000 $ 69,000,000
Equity securities | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 2.50 0.48
Equity securities | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 1,355.65 104.00
Equity securities | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 656.24 22.19
Equity securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets 115,000,000 58,000,000
Equity securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price $ 69.86  
Equity volatility (as a percent) 3.00%  
Equity securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price $ 134.52  
Equity volatility (as a percent) 47.73%  
Equity securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price $ 92.90  
Equity volatility (as a percent) 26.01%  
Asset-backed securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 2,406,000,000 2,454,000,000
Asset-backed securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 8.19 4.00
Asset-backed securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 100.00 100.00
Asset-backed securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset 77.97 71.51
Non-marketable equity securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 400,000,000 $ 726,000,000
Non-marketable equity securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Discount to price (as a percent) 0.00% 0.00%
Price-to-book ratio 0.23  
Non-marketable equity securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Discount to price (as a percent) 100.00% 90.00%
Price-to-book ratio 1.03  
Non-marketable equity securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Discount to price (as a percent) 7.52% 13.36%
Price-to-book ratio 0.78  
Non-marketable equity securities | Comparables Analysis    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 495,000,000 $ 565,000,000
Non-marketable equity securities | Comparables Analysis | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset   $ 0.00
EBITDA multiples 6.30 6.8
Price-to-book ratio   0.32
Non-marketable equity securities | Comparables Analysis | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset   $ 113.23
EBITDA multiples 12.10 10.1
Price-to-book ratio   1.03
Non-marketable equity securities | Comparables Analysis | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset   $ 54.40
EBITDA multiples 8.73 8.62
Price-to-book ratio   0.87
Federal funds sold and securities borrowed or purchased under agreements to resell | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 1,002,000,000 $ 1,496,000,000
Federal funds sold and securities borrowed or purchased under agreements to resell | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR normal volatility (as a percent) 24.54%  
Interest rate (as a percent)   (0.51%)
IR log-normal volatility   12.86%
Federal funds sold and securities borrowed or purchased under agreements to resell | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR normal volatility (as a percent) 80.07%  
Interest rate (as a percent)   5.76%
IR log-normal volatility   75.50%
Federal funds sold and securities borrowed or purchased under agreements to resell | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR normal volatility (as a percent) 66.85%  
Interest rate (as a percent)   2.80%
IR log-normal volatility   61.73%
Loans and leases | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 260,000,000  
Loans and leases | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 0.45%  
Loans and leases | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 5.00%  
Loans and leases | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 0.71%  
Loans and leases | Yield analysis    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 214,000,000  
Loans and leases | Yield analysis | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 3.04%  
Loans and leases | Yield analysis | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 4.54%  
Loans and leases | Yield analysis | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 3.66%  
Loans and leases | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 92,000,000  
Loans | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets   $ 79,000,000
Loans | Yield analysis    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets   $ 221,000,000
Loans | Yield analysis | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent)   2.75%
Loans | Yield analysis | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent)   20.00%
Loans | Yield analysis | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent)   11.09%
Loans | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets   $ 258,000,000
Loans | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset   31.55
Loans | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset   105.74
Loans | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price, asset   56.46
Mortgage servicing rights | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 90,000,000  
Mortgage servicing rights | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
WAL (in years) 3 years 11 months 19 days  
Mortgage servicing rights | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
WAL (in years) 7 years 6 months 7 days  
Mortgage servicing rights | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
WAL (in years) 6 years 1 month 10 days  
Mortgage servicing rights | Cash flow    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 470,000,000 $ 1,473,000,000
Mortgage servicing rights | Cash flow | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 8.00% 4.20%
WAL (in years)   3 years 6 months 11 days
Mortgage servicing rights | Cash flow | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 19.93% 20.56%
WAL (in years)   7 years 2 months 27 days
Mortgage servicing rights | Cash flow | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 12.59% 9.32%
WAL (in years)   5 years 9 months 29 days