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Fair Value Measurements - Separate Account Assets Priced at NAV (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 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 $ 213 $ 239
Separate Account Assets [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments 349  
Separate Account Assets [Member] | Fair Value, Measurements, Recurring [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Fair Value 726 732
Security Partnerships [Member] | Separate Account Assets [Member]    
Fair Value Investments, Entities That Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments $ 349  
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 $ 500 477
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 $ 222 237
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 $ 4 $ 18