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Derivatives - Narrative (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2024 USD ($) swap | Dec. 31, 2023 USD ($) | Dec. 31, 2022 USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Number of interest rate swaps entered into during the period | swap | 1 |  |
Gains (losses) on interest rate swaps expected to be reclassified from AOCI to net earnings over the next 12 months. | $ (8) |  |
Interest rate swaps | Designated as hedging instrument | Net investment income |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Reclassification from accumulated other comprehensive income | (24) | $ (26) | $ 0
Interest rate swaps | Designated as hedging instrument | Maximum | Net investment income |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Reclassification from accumulated other comprehensive income |  |  | $ 1
Interest rate swaps | Cash flow hedging | Designated as hedging instrument |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, notional amount | 1,050 | 1,300 |
Receivable for collateral posted related to swaps | 27 | 48 |
New interest rate swaps entered during the period | Cash flow hedging | Designated as hedging instrument |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Derivative, notional amount | 20 |  |
Total return swap | Derivatives not designated as hedging instruments |  |  |
Derivative Instruments and Hedging Activities Disclosures [Line Items] |  |  |
Receivable for collateral posted related to swaps | $ 4 |  |
Payable to return collateral related to swaps |  | $ 5 |

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