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Investments, Available-for-Sale Securities in Gross Unrealized Loss Position (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 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 2,786 $ 1,666
12 months or longer 351 64
Total 3,137 1,730
Gross Unrealized Losses [Abstract]    
Less than 12 months 55 74
12 months or longer 15 3
Total 70 77
Corporate and Other Bonds [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 1,190 609
12 months or longer 61 12
Total 1,251 621
Gross Unrealized Losses [Abstract]    
Less than 12 months 33 21
12 months or longer 2 1
Total 35 22
States, Municipalities and Political Subdivisions [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 128 33
Total 128 33
Gross Unrealized Losses [Abstract]    
Less than 12 months 2  
Total 2  
Total Asset-Backed [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 1,340 948
12 months or longer 290 52
Total 1,630 1,000
Gross Unrealized Losses [Abstract]    
Less than 12 months 14 50
12 months or longer 13 2
Total 27 52
Residential Mortgage-Backed [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 932 71
12 months or longer 10 11
Total 942 82
Gross Unrealized Losses [Abstract]    
Less than 12 months 10 1
Total 10 1
Commercial Mortgage-Backed [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 153 533
12 months or longer 206 28
Total 359 561
Gross Unrealized Losses [Abstract]    
Less than 12 months 2 40
12 months or longer 12 2
Total 14 42
Other Asset-Backed [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 255 344
12 months or longer 74 13
Total 329 357
Gross Unrealized Losses [Abstract]    
Less than 12 months 2 9
12 months or longer 1  
Total 3 9
U.S. Treasury and Obligations of Government-sponsored Enterprises [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 80 63
Total 80 63
Gross Unrealized Losses [Abstract]    
Less than 12 months 5 3
Total 5 3
Foreign Government [Member]    
Estimated Fair Value [Abstract]    
Less than 12 months 48 13
Total 48 $ 13
Gross Unrealized Losses [Abstract]    
Less than 12 months 1  
Total $ 1