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Fair Value Measurements - Additional Information on Separate Account Assets Priced at Net Asset Value (Details) - Separate Account Assets - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2022
Dec. 31, 2021
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments $ 252  
Recurring | NAV    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 920 $ 842
Securities partnerships    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments 252  
Securities partnerships | Recurring | NAV    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value 540 513
Real estate funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments $ 0  
Real estate funds | Minimum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 30 days  
Real estate funds | Maximum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 90 days  
Real estate funds | Recurring | NAV    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 376 325
Hedge funds    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Unfunded Commitments $ 0  
Hedge funds | Minimum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 30 days  
Hedge funds | Maximum    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Redemption Notice Period 90 days  
Hedge funds | Recurring | NAV    
Fair Value, Investments, Entities that Calculate Net Asset Value Per Share [Line Items]    
Fair Value $ 4 $ 4