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Fair Value - Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2023
Dec. 31, 2022
Carrying Amount    
Assets:    
Other invested assets, primarily mortgage loans $ 1,009 $ 1,040
Liabilities:    
Short term debt 960 853
Long term debt 8,090 8,160
Estimated Fair Value    
Assets:    
Other invested assets, primarily mortgage loans 954 973
Liabilities:    
Short term debt 954 855
Long term debt 7,567 7,621
Estimated Fair Value | Level 1    
Assets:    
Other invested assets, primarily mortgage loans
Liabilities:    
Short term debt
Long term debt
Estimated Fair Value | Level 2    
Assets:    
Other invested assets, primarily mortgage loans
Liabilities:    
Short term debt 785 744
Long term debt 6,908 7,035
Estimated Fair Value | Level 3    
Assets:    
Other invested assets, primarily mortgage loans 954 973
Liabilities:    
Short term debt 169 111
Long term debt $ 659 $ 586