Derivative Financial Instruments - Credit Exposure Related Counterparties (Detail) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Derivative Instruments, Gain (Loss) [Line Items]
Exposure, net of collateral	$ 11	$ 9
Corporate Contracts [Member]
Derivative Instruments, Gain (Loss) [Line Items]
Exposure, net of collateral	$ 11
Percent of exposure to counterparties with credit ratings below S&P AA- or Moody’s Aa3	100.00%