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Fair value measurement - Level 3 Inputs (Details)
Sep. 30, 2015
USD ($)
$ / bbl
Mar. 31, 2015
Jun. 30, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Dec. 31, 2013
USD ($)
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Net derivative asset (liability) $ (1,936,000,000)   $ (746,000,000) $ (2,061,000,000) $ (1,897,000,000) $ (1,855,000,000) $ 326,000,000
Recurring              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Liability fair value 203,975,000,000     215,883,000,000      
Beneficial interests issued by consolidated VIEs 1,199,000,000     2,162,000,000      
Level 3 Analysis - Supplemental Data:              
Trading Securities 292,959,000,000     319,889,000,000      
Trading liabilities 141,474,000,000     152,815,000,000      
Recurring | Level 3              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Liability fair value 26,921,000,000     32,059,000,000      
Beneficial interests issued by consolidated VIEs 1,018,000,000     1,146,000,000      
Level 3 Analysis - Supplemental Data:              
Trading Securities 13,079,000,000     22,489,000,000      
Trading liabilities $ 10,881,000,000     14,698,000,000      
Long-term debt, other borrowed funds, and deposits | Discounted cash flows | Minimum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Credit correlation 35.00%            
Long-term debt, other borrowed funds, and deposits | Discounted cash flows | Maximum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Credit correlation 90.00%            
Long-term debt, other borrowed funds, and deposits | Discounted cash flows | Recurring | Level 3              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Liability fair value $ 506,000,000            
Long-term debt, other borrowed funds, and deposits | Option pricing | Minimum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Interest rate correlation (49.00%)            
Interest rate spread volatility 4.00%            
Foreign exchange correlation 0.00%            
Equity correlation (50.00%)            
Long-term debt, other borrowed funds, and deposits | Option pricing | Maximum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Interest rate correlation 99.00%            
Interest rate spread volatility 30.00%            
Foreign exchange correlation 60.00%            
Equity correlation 80.00%            
Long-term debt, other borrowed funds, and deposits | Option pricing | Recurring | Level 3              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Liability fair value $ 14,495,000,000            
Beneficial interests issued by consolidated VIEs | Discounted cash flows | Minimum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Yield 4.00%            
Prepayment speed 1.00%            
Conditional default rate 2.00%            
Loss severity 40.00%            
Beneficial interests issued by consolidated VIEs | Discounted cash flows | Maximum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Yield 28.00%            
Prepayment speed 12.00%            
Conditional default rate 15.00%            
Loss severity 100.00%            
Beneficial interests issued by consolidated VIEs | Discounted cash flows | Weighted average              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Yield 4.00%            
Prepayment speed 8.00%            
Conditional default rate 2.00%            
Loss severity 48.00%            
Credit derivatives with underlying mortgage risk | Recurring | Level 3              
Level 3 Analysis - Supplemental Data:              
Trading liabilities $ 355,000,000            
Credit derivatives with underlying asset-backed securities risk | Recurring | Level 3              
Level 3 Analysis - Supplemental Data:              
Trading liabilities 453,000,000            
Interest rate              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Net derivative asset (liability) $ 831,000,000   859,000,000 626,000,000 1,210,000,000 1,533,000,000 2,379,000,000
Interest rate | Option pricing | Minimum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Interest rate correlation (49.00%)            
Interest rate spread volatility 4.00%            
Interest rate | Option pricing | Maximum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Interest rate correlation 99.00%            
Interest rate spread volatility 30.00%            
Interest rate | Option pricing | Recurring | Level 3              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Net derivative asset (liability) $ 831,000,000            
Credit              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Net derivative asset (liability) $ 512,000,000   432,000,000 189,000,000 259,000,000 134,000,000 95,000,000
Credit | Discounted cash flows | Minimum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Credit correlation 35.00%            
Credit | Discounted cash flows | Maximum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Credit correlation 90.00%            
Credit | Discounted cash flows | Recurring | Level 3              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Net derivative asset (liability) $ 512,000,000            
Foreign exchange              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Net derivative asset (liability) $ (535,000,000)   405,000,000 (526,000,000) (931,000,000) (1,194,000,000) (1,200,000,000)
Foreign exchange | Option pricing | Minimum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Foreign exchange correlation 0.00%            
Foreign exchange | Option pricing | Maximum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Foreign exchange correlation 60.00%            
Foreign exchange | Option pricing | Recurring | Level 3              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Net derivative asset (liability) $ (535,000,000)            
Equity              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Net derivative asset (liability) $ (1,524,000,000)   (1,848,000,000) (1,785,000,000) (2,421,000,000) (2,206,000,000) (1,063,000,000)
Equity | Option pricing | Minimum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Equity volatility 20.00%            
Equity | Option pricing | Maximum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Equity volatility 65.00%            
Equity | Option pricing | Recurring | Level 3              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Net derivative asset (liability) $ (1,524,000,000)            
Commodity              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Net derivative asset (liability) $ (1,220,000,000)   $ (594,000,000) $ (565,000,000) $ (14,000,000) $ (122,000,000) $ 115,000,000
Commodity | Discounted cash flows | Minimum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Forward commodity price | $ / bbl 33            
Commodity | Discounted cash flows | Maximum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Forward commodity price | $ / bbl 54            
Commodity | Discounted cash flows | Recurring | Level 3              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Net derivative asset (liability) $ (1,220,000,000)            
Residential mortgage-backed securities and loans | Discounted cash flows | Minimum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Yield 4.00%            
Prepayment speed 0.00%            
Conditional default rate 0.00%            
Loss severity 0.00%            
Residential mortgage-backed securities and loans | Discounted cash flows | Maximum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Yield 26.00%            
Prepayment speed 20.00%            
Conditional default rate 11.00%            
Loss severity 100.00%            
Residential mortgage-backed securities and loans | Discounted cash flows | Weighted average              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Yield 6.00%            
Prepayment speed 7.00%            
Conditional default rate 2.00%            
Loss severity 37.00%            
Residential mortgage-backed securities and loans | Discounted cash flows | Recurring | Level 3              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Asset fair value $ 5,653,000,000            
Commercial mortgage-backed securities and loans | Discounted cash flows | Minimum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Yield 0.00%            
Conditional default rate 0.00%            
Loss severity   0.00%          
Commercial mortgage-backed securities and loans | Discounted cash flows | Maximum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Yield 25.00%            
Conditional default rate 91.00%            
Loss severity   40.00%          
Commercial mortgage-backed securities and loans | Discounted cash flows | Weighted average              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Yield 3.00%            
Conditional default rate 21.00%            
Loss severity 29.00%            
Commercial mortgage-backed securities and loans | Discounted cash flows | Recurring | Level 3              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Asset fair value $ 3,970,000,000            
Corporate debt securities, obligations of U.S. states and municipalities, and other | Discounted cash flows | Minimum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Yield 1.00%            
Credit spread 0.60%            
Corporate debt securities, obligations of U.S. states and municipalities, and other | Discounted cash flows | Maximum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Yield 22.00%            
Credit spread 2.70%            
Corporate debt securities, obligations of U.S. states and municipalities, and other | Discounted cash flows | Weighted average              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Yield 5.00%            
Credit spread 2.54%            
Corporate debt securities, obligations of U.S. states and municipalities, and other | Discounted cash flows | Recurring | Level 3              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Asset fair value $ 3,556,000,000            
Corporate debt securities, obligations of U.S. states and municipalities, and other | Market comparables | Minimum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Price 0            
Corporate debt securities, obligations of U.S. states and municipalities, and other | Market comparables | Maximum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Price 139            
Corporate debt securities, obligations of U.S. states and municipalities, and other | Market comparables | Weighted average              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Price 94            
Corporate debt securities, obligations of U.S. states and municipalities, and other | Market comparables | Recurring | Level 3              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Asset fair value $ 3,513,000,000            
Collateralized loan obligations | Discounted cash flows | Minimum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Prepayment speed 20.00%            
Conditional default rate 2.00%            
Loss severity 40.00%            
Credit spread 3.50%            
Collateralized loan obligations | Discounted cash flows | Maximum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Prepayment speed 20.00%            
Conditional default rate 2.00%            
Loss severity 40.00%            
Credit spread 5.25%            
Collateralized loan obligations | Discounted cash flows | Weighted average              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Prepayment speed 20.00%            
Conditional default rate 2.00%            
Loss severity 40.00%            
Credit spread 3.90%            
Collateralized loan obligations | Discounted cash flows | Recurring | Level 3              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Asset fair value $ 755,000,000            
Collateralized loan obligations | Market comparables | Minimum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Price 0            
Collateralized loan obligations | Market comparables | Maximum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Price 100            
Collateralized loan obligations | Market comparables | Weighted average              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Price 76            
Collateralized loan obligations | Market comparables | Recurring | Level 3              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Asset fair value 160,000,000            
Mortgage servicing rights (MSRs) | Discounted cash flows | Recurring | Level 3              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Asset fair value $ 6,716,000,000            
Private equity investments | Market comparables | Private equity investments | Minimum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
EBITDA multiple 6.4            
Liquidity adjustment 0.00%            
Private equity investments | Market comparables | Private equity investments | Maximum              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
EBITDA multiple 9.9            
Liquidity adjustment 15.00%            
Private equity investments | Market comparables | Private equity investments | Weighted average              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
EBITDA multiple 8.7            
Liquidity adjustment 6.00%            
Private equity investments | Market comparables | Recurring | Level 3 | Private equity investments              
Fair Value, Assets and Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]              
Asset fair value $ 1,700,000,000            
Credit derivatives with underlying mortgage risk | Recurring | Level 3              
Level 3 Analysis - Supplemental Data:              
Trading Securities 394,000,000            
Credit derivatives with underlying asset-backed securities risk | Recurring | Level 3              
Level 3 Analysis - Supplemental Data:              
Trading Securities $ 491,000,000