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Investments (Contractholder-Directed Equity Securities and FVO Securities) (Details) - USD ($) $ in Millions | Sep. 30, 2024 | Dec. 31, 2023
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Debt and Equity Securities, FV-NI [Line Items] |  |
Debt Securities, Trading, and Equity Securities, FV-NI, Cost | $ 7,288 | $ 8,742
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses) | 2,001 | 1,589
Contractholder-directed equity securities and fair value option securities, at estimated fair value | 9,289 | 10,331
Unit-linked investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Debt Securities, Trading, and Equity Securities, FV-NI, Cost | 6,263 | 7,770
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses) | 1,345 | 1,112
Contractholder-directed equity securities and fair value option securities, at estimated fair value | 7,608 | 8,882
FVO securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Debt Securities, Trading, and Equity Securities, FV-NI, Cost | 1,025 | 972
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses) | 656 | 477
Contractholder-directed equity securities and fair value option securities, at estimated fair value | $ 1,681 | $ 1,449

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