Income Taxes - Summary of Operating Loss and Credit Carryovers (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021
Operating Loss Carryforwards [Line Items]
Net operating loss carryovers, Tax-Effected	$ 91
Valuation allowance, Operating loss and credit carryovers	79	$ 69
Operating Loss and Credit Carryovers	12
Federal [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryovers, Gross	38
Net operating loss carryovers, Tax-Effected	$ 8
Net operating loss, Expiration	2032
Credit carryovers, Tax-Effected	$ 3
Credit carryovers, Expiration	2027
Valuation allowance, Operating loss and credit carryovers	$ 1
Operating Loss and Credit Carryovers	7
Tax credit carryovers	3
State and Local Jurisdiction [Member]
Operating Loss Carryforwards [Line Items]
Net operating loss carryovers, Gross	523
Net operating loss carryovers, Tax-Effected	$ 36
Net operating loss, Expiration	2024
Valuation allowance, Operating loss and credit carryovers	$ 34
Operating Loss and Credit Carryovers	2
State IRC § 163(j) disallowed interest expense carryovers, Gross	2,586
State IRC § 163(j) disallowed interest expense carryovers, Tax-Effected	$ 44
State IRC § 163(j) disallowed interest expense carryovers, Expiration	Indefinite
State IRC § 163(j) disallowed interest expense carryovers, Corresponding Valuation Allowance	$ 44