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Investments, Available-for-Sale Securities in Gross Unrealized Loss Position (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Gross Unrealized Losses [Abstract]    
Additional impairment losses $ 0  
Fixed Maturity Securities [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 4,927 $ 1,666
12 months or longer 341 64
Total 5,268 1,730
Gross Unrealized Losses [Abstract]    
Less than 12 months 71 74
12 months or longer 18 3
Total 89 77
Corporate and Other Bonds [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 1,853 609
12 months or longer 88 12
Total 1,941 621
Gross Unrealized Losses [Abstract]    
Less than 12 months 37 21
12 months or longer 5 1
Total 42 22
States, Municipalities and Political Subdivisions [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 885 33
Total 885 33
Gross Unrealized Losses [Abstract]    
Less than 12 months 15  
Total 15  
Total Asset-Backed [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 2,051 948
12 months or longer 252 52
Total 2,303 1,000
Gross Unrealized Losses [Abstract]    
Less than 12 months 13 50
12 months or longer 13 2
Total 26 52
Residential Mortgage-Backed [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 1,295 71
12 months or longer   11
Total 1,295 82
Gross Unrealized Losses [Abstract]    
Less than 12 months 6 1
Total 6 1
Commercial Mortgage-Backed [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 317 533
12 months or longer 194 28
Total 511 561
Gross Unrealized Losses [Abstract]    
Less than 12 months 4 40
12 months or longer 12 2
Total 16 42
Other Asset-Backed [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 439 344
12 months or longer 58 13
Total 497 357
Gross Unrealized Losses [Abstract]    
Less than 12 months 3 9
12 months or longer 1  
Total 4 9
U.S. Treasury and Obligations of Government-sponsored Enterprises [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 65 63
12 months or longer 1  
Total 66 63
Gross Unrealized Losses [Abstract]    
Less than 12 months 4 3
Total 4 3
Foreign Government [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 73 13
Total 73 $ 13
Gross Unrealized Losses [Abstract]    
Less than 12 months 2  
Total $ 2