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Junior Subordinated Debt Securities (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Debt Instrument [Line Items] |  |  |
Debt Instrument, Description of Variable Rate Basis | three-month CME Term SOFR plus 0.26161% |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 108 | $ 87 |
Interest Expense, Junior Subordinated Debentures | 261 | 261 | $ 261
Senior notes |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 106 | 83 |
Debt Instrument, Interest Rate, Stated Percentage | 5.70% |  |
Junior Subordinated Debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 3,200 | 3,200 |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | 39 | 42 |
Junior Subordinated Debt Instrument One [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | 500 | 500 |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 5 | 5 |
Debt Instrument, Interest Rate, Stated Percentage | 10.75% |  |
Junior Subordinated Debt Instrument Four [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 1,250 | 1,250 |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 14 | 15 |
Debt Instrument, Interest Rate, Stated Percentage | 6.40% |  |
Junior Subordinated Debt Instrument Three [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 700 | 700 |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 12 | 13 |
Debt Instrument, Interest Rate, Stated Percentage | 7.875% |  |
Junior Subordinated Debt Instrument Two [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount | $ 750 | 750 |
Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net | $ 8 | $ 9 |
Debt Instrument, Interest Rate, Stated Percentage | 9.25% |  |

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