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Insurance (Reconciliation of Separate Account Liability) (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2022
Separate Account, Liability [Line Items]
Separate account liabilities	$ 87,440	$ 84,965	$ 104,441
Variable income annuities	150		161
Pension risk transfer annuities	18		20
Rollforwards Total
Separate Account, Liability [Line Items]
Separate account liabilities	$ 87,272		$ 104,260

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- Definition

Pension risk transfer annuities

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Variable income annuities

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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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