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Investments (Rollforward of Total Amount of Credit-Related OTTI) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Net Investment Income [Line Items]    
Held-to-maturity $ 57 $ 61
Available-for-sale 85 75
Trading 0 1
Total securities 142 137
Taxable    
Net Investment Income [Line Items]    
Held-to-maturity 56 60
Available-for-sale 77 69
Trading 0 1
Total securities 133 130
Nontaxable    
Net Investment Income [Line Items]    
Held-to-maturity 1 1
Available-for-sale 8 6
Trading 0 0
Total securities $ 9 $ 7