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Derivative Instruments (Current Period Cash Flow Hedges in AOCI (loss) before Taxes) (Details) - Cash Flow Hedging [Member] - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |  |
--- | --- | --- | --- | --- | --- | ---
Sep. 30, 2025 | Sep. 30, 2024 | Sep. 30, 2025 | Sep. 30, 2024 | Jun. 30, 2025 | Dec. 31, 2024 | Jun. 30, 2024 | Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Derivative, Amount of Hedged Item | $ (572) | $ (229) | $ (572) | $ (229) | $ (473) | $ (495) | $ (413) | $ (218)
Cash Flow Derivatives Deferred In OCI | 115 | 167 | 125 | 44 |  |  |  |
Investment Income [Member] |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI | (18) | (20) | (54) | (42) |  |  |  |
Interest Expense [Member] |  |  |  |  |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |  |  |  |  |
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI | $ (2) | $ (3) | $ (6) | $ (9) |  |  |  |

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- Definition Line items represent financial concepts included in a table. 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