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Collateral Financing Arrangements (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2007
Parent Company |  |  |  |
Collateral Financing Arrangements (Textuals) [Abstract] |  |  |  |
Interest expense | $ 907 | $ 829 | $ 847 |
MRC [Member] | Secured Debt [Member] |  |  |  |
Collateral Financing Arrangements (Textuals) [Abstract] |  |  |  |
Interest expense | 44 | 22 | 11 |
Debt Instrument, Face Amount |  |  |  | $ 2,500
Debt Instrument, Term in Years |  |  |  | 35 years
Partial repurchase | 79 | 50 | 79 |
Increase (Decrease) in Other Receivables | 8 | 7 | 10 |
MRC [Member] | Cash Received (Paid) Collateral Financing Arrangements MRC [Member] |  |  |  |
Collateral Financing Arrangements (Textuals) [Abstract] |  |  |  |
Cash Received (Paid) In Connection With Collateral Financing Arrangements | $ 8 | $ 7 | $ 10 |
MRC [Member] | Parent Company | Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate Terms | compounded SOFR calculated in arrears plus a spread adjustment of 0.26161% |  |  | three-month LIBOR plus 1.12%
MRC [Member] | Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate Terms | three-month tenor plus a spread adjustment of 0.26161% |  |  | three-month LIBOR plus 0.55%

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