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Condensed Financial Information (Parent Company) (Interest Expense) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Interest Expense [Abstract]      
Total interest expense $ 740 $ 655 $ 647
Parent Company      
Interest Expense [Abstract]      
Total interest expense 907 829 847
Parent Company | Long-term Debt      
Interest Expense [Abstract]      
Total interest expense 653 583 590
Parent Company | Long-term Debt | Affiliated Entity      
Interest Expense [Abstract]      
Total interest expense 45 37 47
Parent Company | Secured Debt [Member]      
Interest Expense [Abstract]      
Total interest expense 4 4 5
Parent Company | Junior Subordinated Debt [Member]      
Interest Expense [Abstract]      
Total interest expense $ 205 $ 205 $ 205