Separate Accounts (Reconciliation of Separate Account Liability) (Details) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024	Jun. 30, 2024
Separate Account, Liability [Line Items]
Separate account liabilities	$ 79,403	$ 79,006	$ 81,575
Variable income annuities	228		198
Pension risk transfer annuities	24		22
Rollforwards Total
Separate Account, Liability [Line Items]
Separate account liabilities	$ 79,151		$ 81,355

Amount of liability for variable contract in which all or portion of contract holder's funds is allocated to specific separate account and supported by assets held in separate account.

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