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Investments (Contractholder-Directed Equity Securities and FVO Securities) (Details) - USD ($) $ in Millions | Jun. 30, 2025 | Dec. 31, 2024
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Debt and Equity Securities, FV-NI [Line Items] |  |
Debt Securities, Trading, and Equity Securities, FV-NI, Cost | $ 8,999 | $ 8,284
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses) | 2,695 | 2,388
Contractholder-directed equity securities and fair value option securities, at estimated fair value | 11,694 | 10,672
Unit-linked investments |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Debt Securities, Trading, and Equity Securities, FV-NI, Cost | 8,031 | 7,398
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses) | 1,935 | 1,699
Contractholder-directed equity securities and fair value option securities, at estimated fair value | 9,966 | 9,097
FVO securities |  |
Debt and Equity Securities, FV-NI [Line Items] |  |
Debt Securities, Trading, and Equity Securities, FV-NI, Cost | 968 | 886
Contracted-Directed Equity Securities and FVO Securities, FV-NI, Unrealized Gains (Losses) | 760 | 689
Contractholder-directed equity securities and fair value option securities, at estimated fair value | $ 1,728 | $ 1,575

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