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Fair Value Disclosures (Valuation Techniques and Sensitivity of Unobservable Inputs Used in Recurring Level 3 Fair Value Measurements) (Details) - Level 3
$ in Millions
3 Months Ended 12 Months Ended
Mar. 31, 2018
USD ($)
$ / MWh
Dec. 31, 2017
USD ($)
$ / MWh
Recurring | MABS    
Fair Value Inputs, Assets and Liabilities, Quantitative Information    
Assets $ 342 $ 423
Recurring | MABS | Comparable Pricing | Minimum    
Fair Value Inputs    
Comparable bond price 0.00% 0.00%
Recurring | MABS | Comparable Pricing | Maximum    
Fair Value Inputs    
Comparable bond price 95.00% 95.00%
Recurring | MABS | Comparable Pricing | Weighted Average    
Fair Value Inputs    
Comparable bond price 41.00% 26.00%
Recurring | Loans and Lending Commitments    
Fair Value Inputs, Assets and Liabilities, Quantitative Information    
Assets $ 8,128 $ 5,945
Recurring | Loans and Lending Commitments | Comparable Pricing | Minimum    
Fair Value Inputs    
Comparable loan price 55.00% 55.00%
Recurring | Loans and Lending Commitments | Comparable Pricing | Maximum    
Fair Value Inputs    
Comparable loan price 101.00% 102.00%
Recurring | Loans and Lending Commitments | Comparable Pricing | Weighted Average    
Fair Value Inputs    
Comparable loan price 97.00% 95.00%
Recurring | Loans and Lending Commitments | Margin Loan Model | Minimum    
Fair Value Inputs    
Discount rate 0.00% 0.00%
Volatility Skew 9.00% 7.00%
Recurring | Loans and Lending Commitments | Margin Loan Model | Maximum    
Fair Value Inputs    
Discount rate 3.00% 3.00%
Volatility Skew 67.00% 41.00%
Recurring | Loans and Lending Commitments | Margin Loan Model | Weighted Average    
Fair Value Inputs    
Discount rate 1.00% 1.00%
Volatility Skew 28.00% 22.00%
Recurring | Corporate and Other Debt    
Fair Value Inputs, Assets and Liabilities, Quantitative Information    
Assets $ 814 $ 701
Recurring | Corporate and Other Debt | Comparable Pricing | Minimum    
Fair Value Inputs    
Comparable bond price 3.00% 3.00%
Recurring | Corporate and Other Debt | Comparable Pricing | Maximum    
Fair Value Inputs    
Comparable bond price 100.00% 134.00%
Recurring | Corporate and Other Debt | Comparable Pricing | Weighted Average    
Fair Value Inputs    
Comparable bond price 70.00% 59.00%
Recurring | Corporate and Other Debt | Discounted Cash Flow    
Fair Value Inputs    
Recovery rate 16.00%  
Recurring | Corporate and Other Debt | Discounted Cash Flow | Minimum    
Fair Value Inputs    
Discount rate 7.00% 7.00%
Recovery rate   6.00%
Recurring | Corporate and Other Debt | Discounted Cash Flow | Maximum    
Fair Value Inputs    
Discount rate 20.00% 20.00%
Recovery rate   36.00%
Recurring | Corporate and Other Debt | Discounted Cash Flow | Weighted Average    
Fair Value Inputs    
Discount rate 15.00% 14.00%
Recovery rate   27.00%
Recurring | Corporate and Other Debt | Option Model | Minimum    
Fair Value Inputs    
At the money volatility 15.00% 17.00%
Recurring | Corporate and Other Debt | Option Model | Maximum    
Fair Value Inputs    
At the money volatility 52.00% 52.00%
Recurring | Corporate and Other Debt | Option Model | Weighted Average    
Fair Value Inputs    
At the money volatility 33.00% 52.00%
Recurring | Corporate Equities    
Fair Value Inputs, Assets and Liabilities, Quantitative Information    
Assets $ 233 $ 166
Recurring | Corporate Equities | Comparable Pricing    
Fair Value Inputs    
Comparable equity price 100.00% 100.00%
Recurring | Interest Rate Contracts    
Fair Value Inputs, Assets and Liabilities, Quantitative Information    
Assets $ 670 $ 1,218
Recurring | Interest Rate Contracts | Option Model    
Fair Value Inputs    
Interest rate curve   2.00%
Recurring | Interest Rate Contracts | Option Model | Simple Average    
Fair Value Inputs    
Inflation volatility 44.00% 44.00%
Interest rate curve 2.00%  
Interest rate volatility skew 40.00% 41.00%
Recurring | Interest Rate Contracts | Option Model | Median    
Fair Value Inputs    
Inflation volatility 41.00% 41.00%
Interest rate curve 2.00%  
Interest rate volatility skew 43.00% 47.00%
Recurring | Interest Rate Contracts | Option Model | Minimum    
Fair Value Inputs    
Inflation volatility 23.00% 23.00%
Interest rate curve 1.00%  
Interest rate volatility skew 29.00% 31.00%
Recurring | Interest Rate Contracts | Option Model | Maximum    
Fair Value Inputs    
Inflation volatility 61.00% 63.00%
Interest rate curve 2.00%  
Interest rate volatility skew 106.00% 97.00%
Recurring | Credit Contracts    
Fair Value Inputs, Assets and Liabilities, Quantitative Information    
Assets $ (30) $ 41
Recurring | Credit Contracts | Comparable Pricing | Minimum    
Fair Value Inputs    
Cash synthetic basis 10.00% 12.00%
Comparable bond price 0.00% 0.00%
Recurring | Credit Contracts | Comparable Pricing | Maximum    
Fair Value Inputs    
Cash synthetic basis 11.00% 13.00%
Comparable bond price 75.00% 75.00%
Recurring | Credit Contracts | Comparable Pricing | Weighted Average    
Fair Value Inputs    
Cash synthetic basis 11.00% 12.00%
Comparable bond price 25.00% 25.00%
Recurring | Credit Contracts | Correlation Model | Minimum    
Fair Value Inputs    
Credit correlation 39.00% 38.00%
Recurring | Credit Contracts | Correlation Model | Maximum    
Fair Value Inputs    
Credit correlation 67.00% 100.00%
Recurring | Credit Contracts | Correlation Model | Weighted Average    
Fair Value Inputs    
Credit correlation 50.00% 48.00%
Recurring | Foreign Exchange Contracts    
Fair Value Inputs, Assets and Liabilities, Quantitative Information    
Assets $ (33) $ (112)
Recurring | Foreign Exchange Contracts | Option Model | Simple Average    
Fair Value Inputs    
Contingency probability 93.00% 96.00%
Interest rate - Foreign exchange correlation 56.00% 56.00%
Interest rate volatility skew 40.00% 41.00%
Recurring | Foreign Exchange Contracts | Option Model | Median    
Fair Value Inputs    
Contingency probability 93.00% 95.00%
Interest rate - Foreign exchange correlation 56.00% 56.00%
Interest rate volatility skew 43.00% 47.00%
Recurring | Foreign Exchange Contracts | Option Model | Minimum    
Fair Value Inputs    
Contingency probability 90.00% 95.00%
Interest rate - Foreign exchange correlation 55.00% 54.00%
Interest rate volatility skew 29.00% 31.00%
Recurring | Foreign Exchange Contracts | Option Model | Maximum    
Fair Value Inputs    
Contingency probability 95.00% 100.00%
Interest rate - Foreign exchange correlation 57.00% 57.00%
Interest rate volatility skew 106.00% 97.00%
Recurring | Equity Contracts    
Fair Value Inputs, Assets and Liabilities, Quantitative Information    
Assets $ 1,015 $ 1,208
Recurring | Equity Contracts | Option Model | Simple Average    
Fair Value Inputs    
Equity - Interest rate correlation 18.00% 18.00%
Recurring | Equity Contracts | Option Model | Median    
Fair Value Inputs    
Equity - Interest rate correlation 14.00% 20.00%
Recurring | Equity Contracts | Option Model | Minimum    
Fair Value Inputs    
At the money volatility 14.00% 7.00%
Equity - Equity correlation 5.00% 5.00%
Equity - Foreign exchange correlation (62.00%) (55.00%)
Equity - Interest rate correlation (7.00%) (7.00%)
Volatility Skew (3.00%) (5.00%)
Recurring | Equity Contracts | Option Model | Maximum    
Fair Value Inputs    
At the money volatility 55.00% 54.00%
Equity - Equity correlation 99.00% 99.00%
Equity - Foreign exchange correlation 55.00% 40.00%
Equity - Interest rate correlation 48.00% 49.00%
Volatility Skew 0.00% 0.00%
Recurring | Equity Contracts | Option Model | Weighted Average    
Fair Value Inputs    
At the money volatility 35.00% 32.00%
Equity - Equity correlation 76.00% 76.00%
Equity - Foreign exchange correlation (42.00%) 36.00%
Volatility Skew (1.00%) (1.00%)
Recurring | Commodity and Other Contracts    
Fair Value Inputs, Assets and Liabilities, Quantitative Information    
Assets $ 1,660 $ 1,446
Recurring | Commodity and Other Contracts | Option Model | Minimum    
Fair Value Inputs    
Commodity volatility 5.00% 7.00%
Cross commodity correlation 5.00% 5.00%
Forward power price | $ / MWh 2 4
Recurring | Commodity and Other Contracts | Option Model | Maximum    
Fair Value Inputs    
Commodity volatility 167.00% 205.00%
Cross commodity correlation 99.00% 99.00%
Forward power price | $ / MWh 212 102
Recurring | Commodity and Other Contracts | Option Model | Weighted Average    
Fair Value Inputs    
Commodity volatility 14.00% 17.00%
Cross commodity correlation 92.00% 92.00%
Forward power price | $ / MWh 30 31
Recurring | Investments    
Fair Value Inputs, Assets and Liabilities, Quantitative Information    
Assets $ 1,012 $ 1,020
Recurring | Investments | Comparable Pricing | Minimum    
Fair Value Inputs    
Comparable equity price 35.00% 45.00%
Recurring | Investments | Comparable Pricing | Maximum    
Fair Value Inputs    
Comparable equity price 100.00% 100.00%
Recurring | Investments | Comparable Pricing | Weighted Average    
Fair Value Inputs    
Comparable equity price 93.00% 92.00%
Recurring | Investments | Discounted Cash Flow | Minimum    
Fair Value Inputs    
Exit multiple 8 8
WACC 9.00% 8.00%
Recurring | Investments | Discounted Cash Flow | Maximum    
Fair Value Inputs    
Exit multiple 10 11
WACC 15.00% 15.00%
Recurring | Investments | Discounted Cash Flow | Weighted Average    
Fair Value Inputs    
Exit multiple 10 10
WACC 9.00% 9.00%
Recurring | Investments | Market Approach | Minimum    
Fair Value Inputs    
EBITDA multiple 6 6
Recurring | Investments | Market Approach | Maximum    
Fair Value Inputs    
EBITDA multiple 24 25
Recurring | Investments | Market Approach | Weighted Average    
Fair Value Inputs    
EBITDA multiple 11 11
Recurring | Securities Sold Under Agreements to Repurchase    
Fair Value Inputs, Assets and Liabilities, Quantitative Information    
Liabilities $ 0 $ 150
Recurring | Securities Sold Under Agreements to Repurchase | Discounted Cash Flow | Minimum    
Fair Value Inputs    
Funding spread   1.07%
Recurring | Securities Sold Under Agreements to Repurchase | Discounted Cash Flow | Maximum    
Fair Value Inputs    
Funding spread   1.26%
Recurring | Securities Sold Under Agreements to Repurchase | Discounted Cash Flow | Weighted Average    
Fair Value Inputs    
Funding spread   1.20%
Recurring | Other Secured Financings    
Fair Value Inputs, Assets and Liabilities, Quantitative Information    
Liabilities $ 220 $ 239
Recurring | Other Secured Financings | Discounted Cash Flow | Minimum    
Fair Value Inputs    
Funding spread 0.54% 0.39%
Recurring | Other Secured Financings | Discounted Cash Flow | Maximum    
Fair Value Inputs    
Funding spread 0.93% 0.76%
Recurring | Other Secured Financings | Discounted Cash Flow | Weighted Average    
Fair Value Inputs    
Funding spread 0.74% 0.57%
Recurring | Other Secured Financings | Option Model    
Fair Value Inputs    
Volatility Skew (1.00%) (1.00%)
Recurring | Other Secured Financings | Option Model | Minimum    
Fair Value Inputs    
At the money volatility 10.00% 10.00%
Recurring | Other Secured Financings | Option Model | Maximum    
Fair Value Inputs    
At the money volatility 40.00% 40.00%
Recurring | Other Secured Financings | Option Model | Weighted Average    
Fair Value Inputs    
At the money volatility 26.00% 26.00%
Recurring | Borrowings    
Fair Value Inputs, Assets and Liabilities, Quantitative Information    
Liabilities $ 3,626 $ 2,984
Recurring | Borrowings | Option Model | Minimum    
Fair Value Inputs    
At the money volatility 5.00% 5.00%
Equity - Equity correlation 45.00% 39.00%
Equity - Foreign exchange correlation (43.00%) (55.00%)
Volatility Skew (2.00%) (2.00%)
Recurring | Borrowings | Option Model | Maximum    
Fair Value Inputs    
At the money volatility 33.00% 35.00%
Equity - Equity correlation 95.00% 95.00%
Equity - Foreign exchange correlation 30.00% 10.00%
Volatility Skew 0.00% 0.00%
Recurring | Borrowings | Option Model | Weighted Average    
Fair Value Inputs    
At the money volatility 23.00% 22.00%
Equity - Equity correlation 81.00% 86.00%
Equity - Foreign exchange correlation (26.00%) (18.00%)
Volatility Skew 0.00% 0.00%
Nonrecurring | Loans    
Fair Value Inputs, Assets and Liabilities, Quantitative Information    
Assets $ 1,057 $ 924
Nonrecurring | Loans | Corporate Loan Model | Minimum    
Fair Value Inputs    
Credit spread 0.94% 0.93%
Nonrecurring | Loans | Corporate Loan Model | Maximum    
Fair Value Inputs    
Credit spread 4.32% 5.63%
Nonrecurring | Loans | Corporate Loan Model | Weighted Average    
Fair Value Inputs    
Credit spread 2.06% 2.39%
Nonrecurring | Loans | Expected Recovery | Minimum    
Fair Value Inputs    
Asset coverage 95.00% 95.00%
Nonrecurring | Loans | Expected Recovery | Maximum    
Fair Value Inputs    
Asset coverage 99.00% 99.00%
Nonrecurring | Loans | Expected Recovery | Weighted Average    
Fair Value Inputs    
Asset coverage 95.00% 95.00%