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FAIR VALUE MEASUREMENT - Valuation Techniques and Inputs for Level 3 Fair Value Measurements (Details) - Level 3 - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Interest-bearing deposits | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Liabilities, fair value $ 286,000,000 $ 293,000,000
Interest-bearing deposits | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mean reversion (as a percent) 1.00% 1.00%
Forward price (as a percent) 99.56% 98.79%
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% 104.07%
Interest-bearing deposits | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mean reversion (as a percent) 10.50% 10.50%
Forward price (as a percent) 99.72% 100.19%
Federal funds purchased and securities loaned or sold under agreements to repurchase | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Liabilities, fair value $ 726,000,000 $ 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) 1.43% 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) 2.16% 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) 2.09% 1.99%
Short-term borrowings and long-term debt | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Liabilities, fair value $ 13,100,000,000 $ 9,774,000,000
Short-term borrowings and long-term debt | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mean reversion (as a percent)   1.00%
Forward price (as a percent) 69.74% 69.05%
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    
Mean reversion (as a percent)   20.00%
Forward price (as a percent) 161.11% 235.35%
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    
Mean reversion (as a percent)   10.50%
Forward price (as a percent) 100.70% 103.28%
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, fair value $ 3,818,000,000 $ 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 9.40%  
Mean reversion (as a percent) 1.00% 1.00%
IR log-normal volatility (as a percent)   1.00%
Trading account assets and liabilities | Interest rate contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR Normal Volatility 77.40%  
Mean reversion (as a percent) 20.00% 20.00%
IR log-normal volatility (as a percent)   93.97%
Trading account assets and liabilities | Interest rate contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR Normal Volatility 58.86%  
Mean reversion (as a percent) 10.50% 10.50%
IR log-normal volatility (as a percent)   62.72%
Trading account assets and liabilities | Foreign exchange contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, fair value $ 940,000,000 $ 1,110,000,000
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) 0.11%  
Foreign exchange (FX) volatility (as a percent) 4.58% 1.39%
IR-IR Correlation (as a percent) (51.00%)  
IR-FX correlation (as a percent) (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) 7.17%  
Foreign exchange (FX) volatility (as a percent) 15.02% 26.85%
IR-IR Correlation (as a percent) 40.00%  
IR-FX correlation (as a percent) 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) 1.73%  
Foreign exchange (FX) volatility (as a percent) 8.16% 15.18%
IR-IR Correlation (as a percent) 36.56%  
IR-FX correlation (as a percent) 49.04%  
Trading account assets and liabilities | Foreign exchange contracts | Cash flow    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, fair value   $ 134,000,000
Trading account assets and liabilities | Foreign exchange contracts | Cash flow | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent)   (0.85%)
Credit spread (as a percent)   0.04%
IR-IR Correlation (as a percent)   40.00%
IR-FX correlation (as a percent)   16.41%
Trading account assets and liabilities | Foreign exchange contracts | Cash flow | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent)   (0.49%)
Credit spread (as a percent)   6.57%
IR-IR Correlation (as a percent)   50.00%
IR-FX correlation (as a percent)   60.00%
Trading account assets and liabilities | Foreign exchange contracts | Cash flow | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Interest rate (as a percent)   (0.84%)
Credit spread (as a percent)   2.66%
IR-IR Correlation (as a percent)   41.27%
IR-FX correlation (as a percent)   49.52%
Trading account assets and liabilities | Equity contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, fair value $ 2,897,000,000 $ 2,701,000,000
Trading account assets and liabilities | Equity contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility (as a percent) 3.00% 3.00%
Forward price (as a percent) 69.74% 69.05%
Equity-FX correlation (as a percent)   (60.70%)
Equity IR Correlation   (35.00%)
Yield Volatility (as a percent)   3.55%
Equity-Equity correlation (as a percent)   (87.70%)
Trading account assets and liabilities | Equity contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility (as a percent) 68.93% 97.78%
Forward price (as a percent) 154.19% 144.61%
Equity-FX correlation (as a percent)   28.20%
Equity IR Correlation   41.00%
Yield Volatility (as a percent)   14.77%
Equity-Equity correlation (as a percent)   96.50%
Trading account assets and liabilities | Equity contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Equity volatility (as a percent) 24.66% 29.52%
Forward price (as a percent) 92.80% 94.28%
Equity-FX correlation (as a percent)   (26.28%)
Equity IR Correlation   (15.65%)
Yield Volatility (as a percent)   9.29%
Equity-Equity correlation (as a percent)   67.45%
Trading account assets and liabilities | Commodity contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, fair value $ 2,937,000,000 $ 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) 3.66% 35.74%
Commodity volatility (as a percent) 8.60% 2.00%
Commodity correlation (as a percent) (37.64%) (41.61%)
Trading account assets and liabilities | Commodity contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent) 290.59% 235.35%
Commodity volatility (as a percent) 66.73% 32.19%
Commodity correlation (as a percent) 91.71% 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) 114.16% 119.99%
Commodity volatility (as a percent) 25.04% 17.07%
Commodity correlation (as a percent) 15.21% 52.85%
Trading account assets and liabilities | Credit derivatives | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, fair value $ 1,797,000,000 $ 2,786,000,000
Trading account assets and liabilities | Credit derivatives | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit correlation (as a percent) 25.00%  
Recovery rate (as a percent)   20.00%
Trading account assets and liabilities | Credit derivatives | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit correlation (as a percent) 90.00%  
Recovery rate (as a percent)   75.00%
Trading account assets and liabilities | Credit derivatives | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit correlation (as a percent) 44.64%  
Recovery rate (as a percent)   39.75%
Trading account assets and liabilities | Credit derivatives | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, fair value $ 823,000,000 $ 1,403,000,000
Trading account assets and liabilities | Credit derivatives | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price $ 1.00 $ 1.00
Credit spread (as a percent) 0.03% 0.03%
Credit correlation (as a percent)   5.00%
Upfront Points (as a percent) 6.03% 6.00%
Trading account assets and liabilities | Credit derivatives | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price $ 100.24 $ 167.00
Credit spread (as a percent) 16.36% 15.15%
Credit correlation (as a percent)   90.00%
Upfront Points (as a percent) 97.26% 99.90%
Trading account assets and liabilities | Credit derivatives | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price $ 57.63 $ 77.35
Credit spread (as a percent) 1.73% 2.56%
Credit correlation (as a percent)   34.27%
Upfront Points (as a percent) 62.88% 72.89%
Nontrading derivatives and other financial assets and liabilities | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Derivatives, fair value $ 24,000,000 $ 42,000,000
Nontrading derivatives and other financial assets and liabilities | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 0.38%  
Upfront Points (as a percent) 61.00% 16.00%
Recovery rate (as a percent) 25.00% 40.00%
Redemption rate (as a percent) 10.72% 3.92%
Nontrading derivatives and other financial assets and liabilities | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 2.75%  
Upfront Points (as a percent) 61.00% 20.50%
Recovery rate (as a percent) 40.00% 40.00%
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    
Credit spread (as a percent) 1.27%  
Upfront Points (as a percent) 61.00% 18.78%
Recovery rate (as a percent) 31.56% 40.00%
Redemption rate (as a percent) 74.24% 74.69%
Securities sold, not yet purchased | Trading account liabilities | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Liabilities, fair value   $ 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   12.86%
Securities sold, not yet purchased | Trading account liabilities | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR Normal Volatility   75.50%
Securities sold, not yet purchased | Trading account liabilities | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR Normal Volatility   61.73%
Securities sold, not yet purchased | Trading account liabilities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Liabilities, fair value $ 21,000,000  
Securities sold, not yet purchased | Trading account liabilities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 1.00  
Securities sold, not yet purchased | Trading account liabilities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 287.64  
Securities sold, not yet purchased | Trading account liabilities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 88.19  
Fixed income securities    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price for instrument valued at par 100  
Fixed income securities | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price for instrument valued at par 0  
Fixed income securities | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price for instrument valued at par 100  
Mortgage-backed securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets 214,000,000 $ 509,000,000
Mortgage-backed securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 2.96 5.50
Mortgage-backed securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 101.00 113.48
Mortgage-backed securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 56.52 61.74
Mortgage-backed securities | Yield analysis    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 184,000,000 $ 368,000,000
Mortgage-backed securities | Yield analysis | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 2.52% 1.90%
Mortgage-backed securities | Yield analysis | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 14.06% 14.54%
Mortgage-backed securities | Yield analysis | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 5.97% 4.34%
State and municipal, foreign government, corporate, and other debt securities | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 949,000,000  
State and municipal, foreign government, corporate, and other debt securities | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 0.00  
State and municipal, foreign government, corporate, and other debt securities | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 184.04  
State and municipal, foreign government, corporate, and other debt securities | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 91.74  
State and municipal, foreign government, corporate, and other debt securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 914,000,000 $ 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   15.00
Yield (as a percent) 2.36%  
Credit spread (as a percent) 0.35%  
State and municipal, foreign government, corporate, and other debt securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   103.60
Yield (as a percent) 14.25%  
Credit spread (as a percent) 5.00%  
State and municipal, foreign government, corporate, and other debt securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   89.93
Yield (as a percent) 6.03%  
Credit spread (as a percent) 2.49%  
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 $ 55,000,000 $ 69,000,000
Equity securities | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   0.48
WAL (in years) 2 years 6 months  
Equity securities | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   104.00
WAL (in years) 2 years 6 months  
Equity securities | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   22.19
WAL (in years) 2 years 6 months  
Equity securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 65,000,000 58,000,000
Equity securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 0.00  
Equity securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 25,450.00  
Equity securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 2,526.62  
Asset-backed securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets 2,287,000,000 2,454,000,000
Asset-backed securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 4.25 4.00
Asset-backed securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 100.60 100.00
Asset-backed securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 74.57 71.51
Non-marketable equity securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 223,000,000 $ 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 0.05  
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 1.00  
Non-marketable equity securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Discount to price (as a percent) 11.83% 13.36%
Price-to-book ratio 0.32  
Non-marketable equity securities | Comparables Analysis    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 423,000,000 $ 565,000,000
Non-marketable equity securities | Comparables Analysis | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   $ 0.00
EBITDA multiples 6.90 6.80
Price-to-book ratio   0.3200
Non-marketable equity securities | Comparables Analysis | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   $ 113.23
EBITDA multiples 12.80 10.10
Price-to-book ratio   1.0300
Non-marketable equity securities | Comparables Analysis | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   $ 54.40
EBITDA multiples 8.66 8.62
Price-to-book ratio   0.8700
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 $ 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    
Interest rate (as a percent) 1.43% (0.51%)
IR log-normal volatility (as a percent)   12.86%
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) 2.16% 5.76%
IR log-normal volatility (as a percent)   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    
Interest rate (as a percent) 2.09% 2.80%
IR log-normal volatility (as a percent)   61.73%
Loans | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 391,000,000 $ 79,000,000
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   258,000,000
Loans | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 148,000,000  
Price   31.55
Yield (as a percent) 3.09%  
Credit spread (as a percent) 1.34%  
Loans | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   105.74
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    
Price   56.46
Yield (as a percent) 3.13%  
Credit spread (as a percent) 1.73%  
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%
Mortgage servicing rights | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 87,000,000  
Mortgage servicing rights | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
WAL (in years) 3 years 9 months 29 days  
Mortgage servicing rights | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
WAL (in years) 6 years 10 months 21 days  
Mortgage servicing rights | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
WAL (in years) 5 years 11 months 5 days  
Mortgage servicing rights | Cash flow    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 471,000,000 $ 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) 16.38% 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) 11.47% 9.32%
WAL (in years)   5 years 9 months 29 days