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Fair Value - Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Carrying Amount    
Assets [Abstract]    
Other invested assets, primarily mortgage loans $ 1,040 $ 973
Liabilities [Abstract]    
Short term debt 853 93
Long term debt 8,160 8,981
Estimated Fair Value    
Assets [Abstract]    
Other invested assets, primarily mortgage loans 973 1,018
Liabilities [Abstract]    
Short term debt 855 93
Long term debt 7,621 9,781
Estimated Fair Value | Level 1    
Assets [Abstract]    
Other invested assets, primarily mortgage loans
Liabilities [Abstract]    
Short term debt
Long term debt
Estimated Fair Value | Level 2    
Assets [Abstract]    
Other invested assets, primarily mortgage loans
Liabilities [Abstract]    
Short term debt 744
Long term debt 7,035 9,170
Estimated Fair Value | Level 3    
Assets [Abstract]    
Other invested assets, primarily mortgage loans 973 1,018
Liabilities [Abstract]    
Short term debt 111 93
Long term debt $ 586 $ 611