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Collateral Financing Arrangements (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2007
Collateral Financing Arrangements (Textuals) [Abstract] |  |  |  |
AmountTransferredTo(From)TheTrust | $ 119 | $ 78 | $ (78) |
Parent Company |  |  |  |
Collateral Financing Arrangements (Textuals) [Abstract] |  |  |  |
Interest expense | 829 | 847 | 833 |
MRC [Member] | Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate Terms |  |  |  | three-month LIBOR plus 0.55%
Collateral Financing Arrangements (Textuals) [Abstract] |  |  |  |
Interest expense | 22 | 11 | 20 |
Debt Instrument, Face Amount |  |  |  | $ 2,500
Debt Instrument, Term in Years |  |  |  | 35 years
Partial repurchase | 50 | 79 | 148 |
Increase (Decrease) in Other Receivables | 7 | 10 | 20 |
MRC [Member] | Cash Received (Paid) Collateral Financing Arrangements MRC [Member] |  |  |  |
Collateral Financing Arrangements (Textuals) [Abstract] |  |  |  |
Cash Received (Paid) In Connection With Collateral Financing Arrangements | $ 7 | $ 10 | $ 20 |
MRC [Member] | Parent Company | Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Interest Rate Terms |  |  |  | three-month LIBOR plus 1.12%

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