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Condensed Financial Information (Parent Company) (Interest Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Interest Expense [Abstract] |  |  |
Total interest expense | $ 655 | $ 647 | $ 632
Parent Company |  |  |
Interest Expense [Abstract] |  |  |
Total interest expense | 829 | 847 | 833
Parent Company | Long-term Debt |  |  |
Interest Expense [Abstract] |  |  |
Total interest expense | 583 | 590 | 570
Parent Company | Long-term Debt | Affiliated Entity |  |  |
Interest Expense [Abstract] |  |  |
Total interest expense | 37 | 47 | 52
Parent Company | Secured Debt [Member] |  |  |
Interest Expense [Abstract] |  |  |
Total interest expense | 4 | 5 | 6
Parent Company | Junior Subordinated Debt [Member] |  |  |
Interest Expense [Abstract] |  |  |
Total interest expense | $ 205 | $ 205 | $ 205

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