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Investments (Rollforward of Total Amount of Credit-Related OTTI) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2023
Mar. 31, 2022
Net Investment Income [Line Items]    
Held-to-maturity $ 61 $ 3
Available-for-sale 75 104
Trading 1 5
Total securities 137 112
Taxable    
Net Investment Income [Line Items]    
Held-to-maturity 60 2
Available-for-sale 69 96
Trading 1 0
Total securities 130 98
Nontaxable    
Net Investment Income [Line Items]    
Held-to-maturity 1 1
Available-for-sale 6 8
Trading 0 5
Total securities $ 7 $ 14