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Business and Summary of Significant Accounting Policies - Management Estimates (Details) - USD ($) $ in Millions	Dec. 31, 2021	Sep. 30, 2021	Dec. 31, 2020	Dec. 31, 2019
Business Acquisition [Line Items]
Future policy reserves	$ (4,732)		$ (4,010)
Intangibles assets	$ (2,034)		$ (1,724)	$ 0
Change in Accounting Method Accounted for as Change in Estimate
Business Acquisition [Line Items]
Future policy reserves		$ 425
Intangibles assets		136
Liability for guaranteed minimum withdrawal benefit		$ 28

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Amount, after accumulated amortization, of deferred policy acquisition costs and present value of future profits from insurance contract acquired in business combination.

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Amount of expected guaranteed benefits in excess of the projected account balances for minimum guaranteed benefit contracts, as of the balance sheet date.

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Amount, before effect of reinsurance, of present value of future benefit to be paid to or on behalf of policyholder and related expense less present value of future net premium receivable under insurance contract.

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