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Fair Value Measurements - Separate Account Assets Priced at NAV (Details) - Separate Account Assets [Member] - 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]    
Unfunded Commitments $ 279  
Fair Value, Measurements, Recurring [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value 939 $ 928
Security Partnerships [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments $ 279  
Redemption Frequency [1] Not applicable  
Security Partnerships [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 460 $ 406
Real Estate Funds [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments $ 0  
Redemption Frequency [1] Quarterly  
Real Estate Funds [Member] | Minimum [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 45 days 45 days
Real Estate Funds [Member] | Maximum [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 90 days 90 days
Real Estate Funds [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 281 $ 261
Hedge Funds [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments $ 0  
Redemption Frequency [1] Up to Annually, varying by fund  
Hedge Funds [Member] | Minimum [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 30 days 30 days
Hedge Funds [Member] | Maximum [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 90 days 90 days
Hedge Funds [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 198 $ 261
[1] The attributes noted are effective as of September 30, 2016 and December 31, 2015.