Debt - Holding Company Debt (Details) - Holding Company - USD ($) $ in Millions	3 Months Ended
Mar. 31, 2022	Feb. 28, 2022
Debt Instrument [Line Items]
Gain (loss) on extinguishment of debt	$ (1)
6.750% senior unsecured notes due 2024
Debt Instrument [Line Items]
Debt face amount		$ 500
Interest rate on debt instrument		6.75%

Face (par) amount of debt instrument at time of issuance.

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