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Derivative Instruments (Current Period Cash Flow Hedges in AOCI (loss) before Taxes) (Details) - Cash Flow Hedging [Member] - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Jun. 30, 2023
Dec. 31, 2022
Jun. 30, 2022
Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]                
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax $ (351) $ (230) $ (351) $ (230) $ (228) $ (205) $ (206) $ (22)
Derivative Gain Loss Net Deferred In OCI 128 27 154 215        
Investment Income [Member]                
Derivative Instruments, Gain (Loss) [Line Items]                
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net (8) (3) (15) (5)        
Interest Expense [Member]                
Derivative Instruments, Gain (Loss) [Line Items]                
Derivative Instruments, Gain (Loss) Reclassified from Accumulated OCI into Income, Effective Portion, Net $ (3) $ 0 $ (7) $ 2