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Fair Value, Financial Assets and Liabilities Not Measured at Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2021
Dec. 31, 2020
Carrying Amount [Member]    
Assets [Abstract]    
Other invested assets, primarily mortgage loans $ 1,006 $ 1,068
Liabilities [Abstract]    
Short term debt 121 35
Long term debt 8,982 10,042
Estimated Fair Value [Member]    
Assets [Abstract]    
Other invested assets, primarily mortgage loans 1,079 1,151
Liabilities [Abstract]    
Short term debt 125 36
Long term debt 10,018 11,247
Estimated Fair Value [Member] | Level 2 [Member]    
Liabilities [Abstract]    
Short term debt   19
Long term debt 9,397 10,482
Estimated Fair Value [Member] | Level 3 [Member]    
Assets [Abstract]    
Other invested assets, primarily mortgage loans 1,079 1,151
Liabilities [Abstract]    
Short term debt 125 17
Long term debt $ 621 $ 765