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Separate Accounts (Aggregate FV of Assets Supporting Separate Accounts) (Details) - USD ($) $ in Millions | Mar. 31, 2024 | Dec. 31, 2023
--- | --- | ---
Separate Account, Liability [Line Items] |  |
Separate account assets | $ 90,332 | $ 88,271
Equity securities |  |
Separate Account, Liability [Line Items] |  |
Separate account assets | 90,065 | 87,999
Fixed maturity securities |  |
Separate Account, Liability [Line Items] |  |
Separate account assets | 260 | 258
Cash and cash equivalents |  |
Separate Account, Liability [Line Items] |  |
Separate account assets | 2 | 7
Other assets |  |
Separate Account, Liability [Line Items] |  |
Separate account assets | $ 5 | $ 7

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