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Employee Benefit Plans and Equity Compensation Plan (Funded Status) (Detail) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	$ 747	$ 725	$ 677
Pension Benefits
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets	747	725
Benefit obligation	742	727	732
Funded status	5	(2)
Other Postretirement Benefits
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation	184	214	$ 187
Funded status	$ (184)	$ (214)

Amount of asset segregated and restricted to provide benefit under defined benefit plan. Asset includes, but is not limited to, stock, bond, other investment, earning from investment, and contribution by employer and employee.

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