Condensed Financial Information (Parent Company) (Interest Expense) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Interest Expense [Abstract]
Total interest expense	$ 738	$ 740	$ 655
Parent Company
Interest Expense [Abstract]
Total interest expense	920	907	829
Parent Company | Long-term Debt
Interest Expense [Abstract]
Total interest expense	668	653	583
Parent Company | Long-term Debt | Affiliated Entity
Interest Expense [Abstract]
Total interest expense	44	45	37
Parent Company | Secured Debt [Member]
Interest Expense [Abstract]
Total interest expense	3	4	4
Parent Company | Junior Subordinated Debt [Member]
Interest Expense [Abstract]
Total interest expense	$ 205	$ 205	$ 205