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Fair Value Measurements - Additional Information on Separate Account Assets Priced at NAV (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Dec. 31, 2019
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments $ 57  
Minimum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 45 days  
Maximum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 90 days  
Recurring    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 179 $ 184
Separate Account Assets    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments 302  
Separate Account Assets | Recurring | NAV    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 742 756
Securities partnerships | Separate Account Assets    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments $ 302  
Securities partnerships | Separate Account Assets | Recurring    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Expected liquidation period after inception 10 years  
Securities partnerships | Separate Account Assets | Recurring | NAV    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 513 531
Real estate funds | Separate Account Assets    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments $ 0  
Real estate funds | Separate Account Assets | Minimum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 30 days  
Real estate funds | Separate Account Assets | Maximum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 90 days  
Real estate funds | Separate Account Assets | Recurring | NAV    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 224 220
Hedge funds | Separate Account Assets    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments $ 0  
Hedge funds | Separate Account Assets | Minimum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 30 days  
Hedge funds | Separate Account Assets | Maximum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 90 days  
Hedge funds | Separate Account Assets | Recurring | NAV    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 5 $ 5