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Separate Accounts - Schedule of Fair Value of Separate Account Assets (Details) - USD ($) $ in Millions | Mar. 31, 2025 | Dec. 31, 2024
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Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | $ 162,506 | $ 168,438
Mutual funds and collective investment trusts |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 161,823 | 167,759
Exchange-traded funds |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 249 | 336
Fixed maturity AFS securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 168 | 161
Cash and invested cash |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 77 | 12
Other investments |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | $ 189 | $ 170

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