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Derivative Instruments (Cash Flow Hedges) (Details) - Cash Flow Hedging [Member] - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2025 | Mar. 31, 2024
Derivative Instruments, Gain (Loss) [Line Items] |  |
Cash Flow Derivatives Deferred In OCI | $ 6 | $ 86
Investment Income [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI | 18 | 8
Interest Expense [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI | 2 | 3
Interest Rate Swaps |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Cash Flow Derivatives Deferred In OCI | 12 | 57
Interest Rate Swaps | Investment Income [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI | 1 | 3
Interest Rate Swaps | Interest Expense [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI | 2 | 3
Currency Swap [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Cash Flow Derivatives Deferred In OCI | 18 | 29
Currency Swap [Member] | Investment Income [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI | 17 | 5
Currency Swap [Member] | Interest Expense [Member] |  |
Derivative Instruments, Gain (Loss) [Line Items] |  |
Cash Flow Derivative Gains Losses Reclassified Into Income From AOCI | $ 0 | $ 0

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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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