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FAIR VALUE MEASUREMENT - Valuation Techniques and Inputs for Level 3 Fair Value Measurements (Details) - Level 3 - USD ($)
Jun. 30, 2015
Dec. 31, 2014
Interest-bearing deposits | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Liabilities $ 347,000,000 $ 486,000,000
Interest-bearing deposits | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent)   35.34%
Equity-IR correlation (as a percent) 30.00% 34.00%
Commodity volatility (as a percent)   5.00%
Commodity correlation (as a percent)   (57.00%)
Interest-bearing deposits | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent)   268.77%
Equity-IR correlation (as a percent) 33.00% 37.00%
Commodity volatility (as a percent)   83.00%
Commodity correlation (as a percent)   91.00%
Interest-bearing deposits | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent)   101.74%
Equity-IR correlation (as a percent) 32.50% 35.43%
Commodity volatility (as a percent)   24.00%
Commodity correlation (as a percent)   30.00%
Federal funds purchased and securities loaned or sold under agreements to repurchase | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Liabilities $ 965,000,000 $ 1,043,000,000
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) 0.91% 0.74%
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) 2.48% 2.26%
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) 2.13% 1.90%
Short-term borrowings and long-term debt | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Liabilities $ 7,777,000,000 $ 7,204,000,000
Short-term borrowings and long-term debt | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mean reversion (as a percent) 1.00% 1.00%
Foreign exchange (FX) volatility (as a percent) 8.60%  
Forward price (as a percent) 53.58% 35.34%
Equity volatility (as a percent) 15.00% 10.18%
Equity-FX correlation (as a percent) (88.20%)  
Equity-Equity correlation (as a percent) (66.30%)  
Commodity volatility (as a percent)   5.00%
Commodity correlation (as a percent)   (57.00%)
Credit correlation (as a percent) 87.50% 87.50%
Equity forward (as a percent) 89.50% 89.50%
IR lognormal volatility (as a percent)   18.05%
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%
Foreign exchange (FX) volatility (as a percent) 13.50%  
Forward price (as a percent) 263.20% 268.77%
Equity volatility (as a percent) 67.70% 69.65%
Equity-FX correlation (as a percent) 56.90%  
Equity-Equity correlation (as a percent) 95.00%  
Commodity volatility (as a percent)   83.00%
Commodity correlation (as a percent)   91.00%
Credit correlation (as a percent) 87.50% 87.50%
Equity forward (as a percent) 106.90% 100.80%
IR lognormal volatility (as a percent)   90.65%
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% 10.50%
Foreign exchange (FX) volatility (as a percent) 12.52%  
Forward price (as a percent) 103.51% 101.80%
Equity volatility (as a percent) 32.60% 23.72%
Equity-FX correlation (as a percent) (27.18%)  
Equity-Equity correlation (as a percent) 39.34%  
Commodity volatility (as a percent)   24.00%
Commodity correlation (as a percent)   30.00%
Credit correlation (as a percent) 87.50% 87.50%
Equity forward (as a percent) 92.20% 95.80%
IR lognormal volatility (as a percent)   30.21%
Trading account assets and liabilities | Interest rate contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross) $ 5,775,000,000 $ 8,309,000,000
Trading account assets and liabilities | Interest rate contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mean reversion (as a percent) (7.02%) 1.00%
IR Normal Volatility 0.40%  
IR-IR Correlation (79.00%)  
IR lognormal volatility (as a percent)   18.05%
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%
IR Normal Volatility 226.00%  
IR-IR Correlation 86.90%  
IR lognormal volatility (as a percent)   90.65%
Trading account assets and liabilities | Interest rate contracts | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Mean reversion (as a percent) 2.02% 10.50%
IR Normal Volatility 98.86%  
IR-IR Correlation (24.20%)  
IR lognormal volatility (as a percent)   30.21%
Trading account assets and liabilities | Foreign exchange contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross) $ 1,416,000,000 $ 1,428,000,000
Trading account assets and liabilities | Foreign exchange contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Foreign exchange (FX) volatility (as a percent) 1.75% 0.37%
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) 32.34% 58.40%
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) 10.50% 8.57%
Trading account assets and liabilities | Foreign exchange contracts | Cash flow    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross) $ 256,000,000 $ 294,000,000
Trading account assets and liabilities | Foreign exchange contracts | Cash flow | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR-IR Correlation (51.00%)  
Forward price (as a percent) 39.60%  
Interest rate (as a percent) 6.50% 3.72%
IR-FX correlation (as a percent) (28.08%) 40.00%
Trading account assets and liabilities | Foreign exchange contracts | Cash flow | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR-IR Correlation 86.90%  
Forward price (as a percent) 219.40%  
Interest rate (as a percent) 6.50% 8.27%
IR-FX correlation (as a percent) 60.00% 60.00%
Trading account assets and liabilities | Foreign exchange contracts | Cash flow | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
IR-IR Correlation 34.87%  
Forward price (as a percent) 106.05%  
Interest rate (as a percent) 6.50% 5.02%
IR-FX correlation (as a percent) 48.50% 50.00%
Trading account assets and liabilities | Equity contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross) $ 4,332,000,000 $ 4,431,000,000
Trading account assets and liabilities | Equity contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent) 89.70%  
Equity volatility (as a percent) 13.58% 9.56%
Equity-FX correlation (as a percent) (88.20%)  
Equity-Equity correlation (as a percent) (66.30%)  
Equity-IR correlation (as a percent) (38.00%)  
Trading account assets and liabilities | Equity contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent) 113.54%  
Equity volatility (as a percent) 67.70% 82.44%
Equity-FX correlation (as a percent) 56.90%  
Equity-Equity correlation (as a percent) 95.00%  
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    
Forward price (as a percent) 93.17%  
Equity volatility (as a percent) 31.69% 24.61%
Equity-FX correlation (as a percent) (26.38%)  
Equity-Equity correlation (as a percent) 39.96%  
Equity-IR correlation (as a percent) 32.73%  
Trading account assets and liabilities | Equity contracts | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross)   $ 502,000,000
Trading account assets and liabilities | Equity contracts | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   $ 0.01
Equity-FX correlation (as a percent)   (88.20%)
Equity-Equity correlation (as a percent)   (66.30%)
Equity forward (as a percent)   84.10%
Trading account assets and liabilities | Equity contracts | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   $ 144.50
Equity-FX correlation (as a percent)   48.70%
Equity-Equity correlation (as a percent)   94.80%
Equity forward (as a percent)   100.80%
Trading account assets and liabilities | Equity contracts | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   $ 93.05
Equity-FX correlation (as a percent)   (25.17%)
Equity-Equity correlation (as a percent)   36.87%
Equity forward (as a percent)   94.10%
Trading account assets and liabilities | Commodity contracts | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross) $ 3,214,000,000 $ 3,606,000,000
Trading account assets and liabilities | Commodity contracts | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent) 53.58% 35.34%
Commodity volatility (as a percent) 5.00% 5.00%
Commodity correlation (as a percent) (57.00%) (57.00%)
Trading account assets and liabilities | Commodity contracts | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Forward price (as a percent) 263.20% 268.77%
Commodity volatility (as a percent) 83.00% 83.00%
Commodity correlation (as a percent) 91.00% 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) 105.14% 101.74%
Commodity volatility (as a percent) 24.00% 24.00%
Commodity correlation (as a percent) 30.00% 30.00%
Trading account assets and liabilities | Credit derivatives | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross) $ 4,802,000,000 $ 4,944,000,000
Trading account assets and liabilities | Credit derivatives | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Recovery rate (as a percent) 20.00% 13.97%
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) 39.88% 37.62%
Trading account assets and liabilities | Credit derivatives | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross) $ 1,346,000,000 $ 1,584,000,000
Trading account assets and liabilities | Credit derivatives | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price $ 0.00 $ 1.00
Credit spread (as a percent) 0.05% 0.01%
Credit correlation (as a percent) 5.00% 0.00%
Upfront points (0.0037) 0.39
Trading account assets and liabilities | Credit derivatives | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price $ 111.19 $ 144.50
Credit spread (as a percent) 13.00% 33.80%
Credit correlation (as a percent) 95.00% 95.00%
Upfront points 0.9916 100.00
Trading account assets and liabilities | Credit derivatives | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price $ 58.76 $ 53.86
Credit spread (as a percent) 1.89% 1.80%
Credit correlation (as a percent) 47.54% 58.76%
Upfront points 0.6101 52.26
Nontrading derivatives and other financial assets and liabilities | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Fair value (gross) $ 76,000,000 $ 74,000,000
Nontrading derivatives and other financial assets and liabilities | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 0.76%  
Forward price (as a percent)   107.00%
Interest rate (as a percent) 7.14%  
Recovery rate (as a percent) 19.50%  
Redemption rate (as a percent) 12.99% 13.00%
Nontrading derivatives and other financial assets and liabilities | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent) 4.52%  
Forward price (as a percent)   107.10%
Interest rate (as a percent) 7.18%  
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    
Credit spread (as a percent) 4.14%  
Forward price (as a percent)   107.05%
Interest rate (as a percent) 7.16%  
Recovery rate (as a percent) 36.63%  
Redemption rate (as a percent) 76.18% 68.73%
Securities sold, not yet purchased | Trading account liabilities | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Liabilities $ 74,000,000 $ 251,000,000
Securities sold, not yet purchased | Trading account liabilities | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit-IR correlation (as a percent)   (70.49%)
Equity volatility (as a percent) 15.00%  
Equity forward (as a percent) 89.70%  
Securities sold, not yet purchased | Trading account liabilities | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit-IR correlation (as a percent)   8.81%
Equity volatility (as a percent) 67.70%  
Equity forward (as a percent) 106.90%  
Securities sold, not yet purchased | Trading account liabilities | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit-IR correlation (as a percent)   47.17%
Equity volatility (as a percent) 32.60%  
Equity forward (as a percent) 92.10%  
Securities sold, not yet purchased | Trading account liabilities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Liabilities $ 181,000,000 $ 142,000,000
Securities sold, not yet purchased | Trading account liabilities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 0.19 0.00
Securities sold, not yet purchased | Trading account liabilities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 277.07 117.00
Securities sold, not yet purchased | Trading account liabilities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 56.03 70.33
Fixed income securities    
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 2,203,000,000 2,874,000,000
Mortgage-backed securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 6.38 0.00
Mortgage-backed securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 107.82 127.87
Mortgage-backed securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 85.39 81.43
Mortgage-backed securities | Yield analysis    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 1,038,000,000 $ 1,117,000,000
Mortgage-backed securities | Yield analysis | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 0.68% 0.01%
Mortgage-backed securities | Yield analysis | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 16.92% 19.91%
Mortgage-backed securities | Yield analysis | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 4.51% 5.89%
State and municipal, foreign government, corporate, and other debt securities | Cash flow    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 1,681,000,000 $ 1,860,000,000
State and municipal, foreign government, corporate, and other debt securities | Cash flow | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 0.47%  
Credit spread (as a percent) 0.20% 0.25%
State and municipal, foreign government, corporate, and other debt securities | Cash flow | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 28.50%  
Credit spread (as a percent) 10.56% 6.00%
State and municipal, foreign government, corporate, and other debt securities | Cash flow | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 4.88%  
Credit spread (as a percent) 3.16% 2.33%
State and municipal, foreign government, corporate, and other debt securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 4,602,000,000 $ 5,937,000,000
State and municipal, foreign government, corporate, and other debt securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 0.00 0.00
State and municipal, foreign government, corporate, and other debt securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 120.00 124.00
State and municipal, foreign government, corporate, and other debt securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 73.36 90.62
Equity securities | Cash flow    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 477,000,000 $ 679,000,000
Equity securities | Cash flow | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 4.00% 4.00%
WAL (in years) 3 days 4 days
Equity securities | Cash flow | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 5.00% 5.00%
WAL (in years) 3 years 8 months 20 days 3 years 1 month 22 days
Equity securities | Cash flow | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 4.50% 4.50%
WAL (in years) 1 year 26 days 1 year 26 days
Equity securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 2,695,000,000 $ 2,163,000,000
Equity securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 0.00 0.00
Equity securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 34.02 141.00
Equity securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 6.45 91.00
Asset-backed securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets 4,453,000,000 3,607,000,000
Asset-backed securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 5.00 0.00
Asset-backed securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 100.04 105.50
Asset-backed securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price 76.00 67.01
Non-marketable equity securities | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets 372,000,000 $ 1,224,000,000
Non-marketable equity securities | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price $ 0  
Discount to price (as a percent)   0.00%
EBITDA multiples 4.70  
Price-earnings ratio 9.10  
Price-to-book ratio 1.17  
Non-marketable equity securities | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price $ 3,687  
Discount to price (as a percent)   90.00%
EBITDA multiples 12.50  
Price-earnings ratio 9.10  
Price-to-book ratio 2.03  
Non-marketable equity securities | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price $ 759  
Discount to price (as a percent)   4.04%
EBITDA multiples 10.17  
Price-earnings ratio 9.10  
Price-to-book ratio 1.56  
Non-marketable equity securities | Comparables Analysis    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 836,000,000 $ 1,055,000,000
Non-marketable equity securities | Comparables Analysis | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Discount to price (as a percent) 0.00%  
EBITDA multiples   2.90
Price-earnings ratio   8.10
Price-to-book ratio   0.99
Non-marketable equity securities | Comparables Analysis | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Discount to price (as a percent) 90.00%  
EBITDA multiples   13.10
Price-earnings ratio   13.10
Price-to-book ratio   1.56
Non-marketable equity securities | Comparables Analysis | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Discount to price (as a percent) 37.75%  
EBITDA multiples   9.77
Price-earnings ratio   8.43
Price-to-book ratio   1.15
Federal funds sold and securities borrowed or purchased under agreements to resell | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 1,070,000,000 $ 3,156,000,000
Federal funds sold and securities borrowed or purchased under agreements to resell | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit-IR correlation (as a percent) (24.00%)  
Interest rate (as a percent)   1.27%
Federal funds sold and securities borrowed or purchased under agreements to resell | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit-IR correlation (as a percent) (1.00%)  
Interest rate (as a percent)   1.97%
Federal funds sold and securities borrowed or purchased under agreements to resell | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit-IR correlation (as a percent) (9.71%)  
Interest rate (as a percent)   1.80%
Loans | Model-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 887,000,000 $ 832,000,000
Loans | Model-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   4.72
Credit spread (as a percent) 0.39%  
Loans | Model-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   106.55
Credit spread (as a percent) 9.05%  
Loans | Model-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Price   98.56
Credit spread (as a percent) 1.62%  
Loans | Cash flow    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 1,856,000,000 $ 1,095,000,000
Loans | Cash flow | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 1.50% 1.60%
Loans | Cash flow | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 4.50% 4.50%
Loans | Cash flow | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 2.35% 2.23%
Loans | Price-based    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 659,000,000 $ 740,000,000
Loans | Price-based | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent)   0.35%
Appraised value 56,342,575  
Loans | Price-based | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent)   5.00%
Appraised value 418,054,694  
Loans | Price-based | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Credit spread (as a percent)   1.99%
Appraised value 375,095,357  
Loans | Yield analysis    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets 438,000,000 $ 441,000,000
Mortgage servicing rights | Cash flow    
Fair Value Inputs Assets Liabilities Quantitative Information    
Total assets $ 1,829,000,000 $ 1,750,000,000
Mortgage servicing rights | Cash flow | Minimum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 5.45% 5.19%
WAL (in years) 3 years 5 months 5 days 3 years 3 months 22 days
Mortgage servicing rights | Cash flow | Maximum    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 50.19% 21.40%
WAL (in years) 8 years 22 days 7 years 10 months 21 days
Mortgage servicing rights | Cash flow | Weighted Average    
Fair Value Inputs Assets Liabilities Quantitative Information    
Yield (as a percent) 11.22% 10.25%
WAL (in years) 5 years 8 months 27 days 5 years 2 months 2 days