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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 |  |
--- | --- | --- | ---
Mar. 31, 2025 | Mar. 31, 2024 | Dec. 31, 2024 | Dec. 31, 2023
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Derivative, Amount of Hedged Item | $ (485) | $ (299) | $ (495) | $ (218)
Cash Flow Derivatives Deferred In OCI | (6) | (86) |  |
Interest Rate Swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Cash Flow Derivatives Deferred In OCI | (12) | (57) |  |
Currency Swap [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Cash Flow Derivatives Deferred In OCI | (18) | (29) |  |
Investment Income [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI | 18 | 8 |  |
Investment Income [Member] | Interest Rate Swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI | 1 | 3 |  |
Investment Income [Member] | Currency Swap [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI | 17 | 5 |  |
Interest Expense [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI | 2 | 3 |  |
Interest Expense [Member] | Interest Rate Swaps |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI | 2 | 3 |  |
Interest Expense [Member] | Currency Swap [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI | 0 | 0 |  |
Other Comprehensive Income (Loss) [Member] |  |  |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |  |  |
Cash Flow Derivatives Deferred In OCI | $ (6) | $ (86) |  |

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- Definition Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI + References No definition available. + Details
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- Definition Cash Flow Derivatives Deferred In OCI + References No definition available. + Details
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- Definition Amount of hedged item in hedging relationship. Excludes hedged asset or liability. + References No definition available. + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 815 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 4E -Publisher FASB -URI https://asc.fasb.org/1943274/2147480434/815-10-50-4E + Details
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