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Separate Accounts - Schedule of Fair Value of Separate Account Assets (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
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Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | $ 166,225 | $ 158,257
Mutual funds and collective investment trusts |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 165,556 | 157,578
Exchange-traded funds |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 352 | 350
Fixed maturity AFS securities |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 162 | 167
Cash and invested cash |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | 8 | 25
Other investments |  |
Fair Value, Separate Account Investment [Line Items] |  |
Separate account assets | $ 147 | $ 137

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