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Investments (Rollforward of Total Amount of Credit-Related OTTI) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Net Investment Income [Line Items]        
Held-to-maturity $ 56 $ 60 $ 113 $ 122
Available-for-sale 83 77 168 152
Trading 1 1 1 1
Total securities 140 138 282 275
Taxable        
Net Investment Income [Line Items]        
Held-to-maturity 55 59 111 120
Available-for-sale 75 69 152 138
Trading 0 0 0 0
Total securities 130 128 263 258
Nontaxable        
Net Investment Income [Line Items]        
Held-to-maturity 1 1 2 2
Available-for-sale 8 8 16 14
Trading 1 1 1 1
Total securities $ 10 $ 10 $ 19 $ 17