Related Parties - Summary of Investments - Athora (Details) - USD ($) $ in Millions	Sep. 30, 2026	Dec. 31, 2025
Related Party Transaction [Line Items]
Investment funds	$ 32,675	$ 26,327
Related Party
Related Party Transaction [Line Items]
Investment funds	3,291	2,149
Related Party \| Athora
Related Party Transaction [Line Items]
Investment funds	2,191	1,171
Equity Securities, FV-NI	0	266
Investments	3,178	1,487
Related Party \| Athora \| Corporate
Related Party Transaction [Line Items]
Debt Securities	$ 987	$ 50

Amount, after allowance for credit loss, of investment in debt security measured at fair value with change in fair value recognized in other comprehensive income (available-for-sale), investment in debt security measured at amortized cost (held-to-maturity), and investment in debt security measured at fair value with change in fair value recognized in net income (trading).

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+ Details

- Definition

Amount of investment in equity security measured at fair value with change in fair value recognized in net income (FV-NI).

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