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Collateral Financing Arrangements Collateral Financing Arrangements (Associated with Closed Block) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2007
Debt Instrument [Line Items] |  |  |  |
Invested assets pledged as collateral | $ 26,017 | $ 25,442 |  |
Parent Company [Member] | Secured Debt Mrc [Member] | 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%
Met Life Reinsurance Company Of Charleston [Member] | Secured Debt [Member] |  |  |  |
Debt Instrument [Line Items] |  |  |  |
Debt Instrument, Principal Outstanding | $ 637 | 716 |  |
Other Receivables | 85 | 93 |  |
Invested Assets On Deposit Held In Trust And Pledged As Collateral | 1,397 | 1,369 |  |
Increase (Decrease) in Other Receivables | 8 | 7 | $ 10 |
Invested assets pledged as collateral | $ 10 | $ 43 |  |

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