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Fair Value Measurements (Fair Value And Maximum Future Funding Commitments Related To Investments) (Detail) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2016
Dec. 31, 2015
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Maximum future funding commitments $ 1,965 $ 824
Fair Value $ 3,498 2,477
Minimum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Notice Period For Redemption For Alternative Investments Investment Funds 5 days  
Maximum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Notice Period For Redemption For Alternative Investments Investment Funds 120 days  
Financial [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Maximum future funding commitments $ 188 105
Fair Value $ 549 $ 300
Financial [Member] | Minimum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Expected liquidation period of underlying assets 5 years 5 years
Financial [Member] | Maximum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Expected liquidation period of underlying assets 9 years 9 years
Real Assets [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Maximum future funding commitments $ 274 $ 140
Fair Value $ 520 $ 474
Real Assets [Member] | Minimum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Expected liquidation period of underlying assets 3 years 3 years
Real Assets [Member] | Maximum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Expected liquidation period of underlying assets 7 years 7 years
Distressed [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Maximum future funding commitments $ 196 $ 218
Fair Value $ 463 $ 261
Distressed [Member] | Minimum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Expected liquidation period of underlying assets 5 years 5 years
Distressed [Member] | Maximum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Expected liquidation period of underlying assets 9 years 9 years
Private Credit [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Maximum future funding commitments $ 294 $ 209
Fair Value $ 241 $ 265
Private Credit [Member] | Minimum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Expected liquidation period of underlying assets 3 years 3 years
Private Credit [Member] | Maximum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Expected liquidation period of underlying assets 7 years 7 years
Traditional [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Maximum future funding commitments $ 999 $ 152
Fair Value $ 1,458 $ 895
Traditional [Member] | Minimum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Expected liquidation period of underlying assets 3 years 3 years
Traditional [Member] | Maximum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Expected liquidation period of underlying assets 9 years 9 years
Vintage [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Maximum future funding commitments $ 14  
Fair Value $ 23 $ 13
Vintage [Member] | Minimum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Expected liquidation period of underlying assets 1 year 1 year
Vintage [Member] | Maximum [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Expected liquidation period of underlying assets 2 years 2 years
Investment Funds [Member]    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 244 $ 269