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Schedule I - Summary Of Investments (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties, Cost $ 2,847  
Investments 3,028  
Available-for-sale Securities, Amortized Cost Basis 2,807  
Other Investments 595 $ 478
Available-for-sale Securities 2,949 3,314
Investments 3,544 3,792
Short-term Investments [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 492  
Available-for-sale Securities 492  
ShortTermInvestmentsMember, including Pledged    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 617  
Available-for-sale Securities 617  
Fixed Income Securities [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 2,175  
Available-for-sale Securities 2,317 2,577
Fixed Income Securities [Member] | Municipal Bonds [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 321  
Available-for-sale Securities 358 215
Fixed Income Securities [Member] | Corporate Debt Securities [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 1,059  
Available-for-sale Securities 1,077 1,430
Fixed Income Securities [Member] | Debt Security, Government, Non-US [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 97  
Available-for-sale Securities 98 44
Fixed Income Securities [Member] | Residential Mortgage-Backed Securities [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 256  
Available-for-sale Securities 302 248
Fixed Income Securities [Member] | Collateralized Debt Obligations [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 74  
Available-for-sale Securities 74 146
Fixed Income Securities [Member] | Asset-backed Securities [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 263  
Available-for-sale Securities 303 287
Fixed Income Securities [Member] | Short-term Investments [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Available-for-sale Securities   653
Fixed Income Securities [Member] | U S Government Obligations [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 120  
Available-for-sale Securities 121  
Fixed Income Securities [Member] | US Government Debt Securities [Member]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 105  
Available-for-sale Securities 106 $ 156
Fixed Income Securities [Member] | Corporate Obligations, Excluding Related Party Investments    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Available-for-sale Securities, Amortized Cost Basis 592  
Available-for-sale Securities 612  
Fair Value Amount, Excluding Related Party Investments [Domain]    
SEC Schedule, 12-15, Insurance Companies, Summary of Investments, Other than Investments in Related Parties [Line Items]    
Investments $ 3,028