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Fair Value Measurements - Separate Account Assets Priced at NAV (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments $ 56  
Redemption Frequency quarterly redemption frequency  
Minimum [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 45 days  
Maximum [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 90 days  
Fair Value, Measurements, Recurring [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value   $ 239
Fair value, including disposal groups $ 184  
Separate Account Assets [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments 320  
Separate Account Assets [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value   732
Fair value, including disposal groups 756  
Security Partnerships [Member] | Separate Account Assets [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments $ 320  
Redemption Frequency Not applicable  
Security Partnerships [Member] | Separate Account Assets [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value   477
Fair value, including disposal groups $ 531  
Expected liquidation period after inception 10 years  
Real Estate Funds [Member] | Separate Account Assets [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments $ 0  
Redemption Frequency Quarterly  
Real Estate Funds [Member] | Separate Account Assets [Member] | Minimum [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 30 days  
Real Estate Funds [Member] | Separate Account Assets [Member] | Maximum [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 90 days  
Real Estate Funds [Member] | Separate Account Assets [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value   237
Fair value, including disposal groups $ 220  
Hedge Funds [Member] | Separate Account Assets [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments $ 0  
Redemption Frequency Up to annually, varying by fund  
Hedge Funds [Member] | Separate Account Assets [Member] | Minimum [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 30 days  
Hedge Funds [Member] | Separate Account Assets [Member] | Maximum [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 90 days  
Hedge Funds [Member] | Separate Account Assets [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value   $ 18
Fair value, including disposal groups $ 5