Income Taxes - Tax Sharing Agreement (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022
Related Party Transaction [Line Items]
Valuation allowance, deferred tax assets	$ 0	$ 0
Voya Financial, Inc.
Related Party Transaction [Line Items]
Income taxes payable	$ (16)	$ (4)

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all domestic and foreign income tax obligations due. This amount is the total of current and noncurrent accrued income taxes.

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Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant