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Investments, Available-for-Sale Securities in Gross Unrealized Loss Position (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Gross Unrealized Losses [Abstract]    
Additional impairment losses $ 0  
Fixed Maturity Securities [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 5,085 $ 1,666
12 months or longer 476 64
Total 5,561 1,730
Gross Unrealized Losses [Abstract]    
Less than 12 months 158 74
12 months or longer 24 3
Total 182 77
Corporate and Other Bonds [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 1,868 609
12 months or longer 82 12
Total 1,950 621
Gross Unrealized Losses [Abstract]    
Less than 12 months 66 21
12 months or longer 5 1
Total 71 22
States, Municipalities and Political Subdivisions [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 866 33
Total 866 33
Gross Unrealized Losses [Abstract]    
Less than 12 months 31  
Total 31  
Total Asset-Backed [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 2,241 948
12 months or longer 394 52
Total 2,635 1,000
Gross Unrealized Losses [Abstract]    
Less than 12 months 52 50
12 months or longer 19 2
Total 71 52
Residential Mortgage-Backed [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 1,584 71
12 months or longer 12 11
Total 1,596 82
Gross Unrealized Losses [Abstract]    
Less than 12 months 40 1
Total 40 1
Commercial Mortgage-Backed [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 320 533
12 months or longer 285 28
Total 605 561
Gross Unrealized Losses [Abstract]    
Less than 12 months 9 40
12 months or longer 15 2
Total 24 42
Other Asset-Backed [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 337 344
12 months or longer 97 13
Total 434 357
Gross Unrealized Losses [Abstract]    
Less than 12 months 3 9
12 months or longer 4  
Total 7 9
U.S. Treasury and Obligations of Government-sponsored Enterprises [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 65 63
Total 65 63
Gross Unrealized Losses [Abstract]    
Less than 12 months 7 3
Total 7 3
Foreign Government [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 45 13
Total 45 $ 13
Gross Unrealized Losses [Abstract]    
Less than 12 months 2  
Total $ 2