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Fair Value - Financial Assets and Liabilities not Measured at Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Carrying Amount    
Assets:    
Other invested assets, primarily mortgage loans $ 1,003 $ 1,035
Liabilities:    
Short-term debt 712 1,083
Long-term debt 8,818 7,915
Estimated Fair Value    
Assets:    
Other invested assets, primarily mortgage loans 988 997
Liabilities:    
Short-term debt 707 1,066
Long-term debt 8,732 7,640
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 599 546
Long-term debt 7,892 7,255
Estimated Fair Value | Level 3    
Assets:    
Other invested assets, primarily mortgage loans 988 997
Liabilities:    
Short-term debt 108 520
Long-term debt $ 840 $ 385