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Separate Accounts - Schedule of Fair Value of Separate Account Assets (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | $ 171,483 | $ 158,257
Mutual funds and collective investment trusts |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 170,806 | 157,578
Exchange-traded funds |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 349 | 350
Fixed maturity AFS securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 166 | 167
Cash and invested cash |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 7 | 25
Other investments |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | $ 155 | $ 137

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