Investments (Fixed Maturity Securities AFS - Narrative) (Details) - USD ($) $ in Millions	Mar. 31, 2024	Dec. 31, 2023
Debt Securities, Available-for-sale [Line Items]
Estimated Fair Value of Fixed Maturity Securities AFS	$ 278,409	$ 281,412
Gross Unrealized Gains (Losses)	$ (28,122)	$ (25,835)

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details