Employee Benefit Plans - Pre-tax Net Changes in Projected Benefit Obligations Recognized in Other Comprehensive Income (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Pension
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss (gain) arising during the year	$ 15	$ (2)
Amortization of loss included in net periodic benefit cost	(1)	(1)	$ (1)
Recognition of gain due to curtailment	0	1
Foreign currency exchange	0	(1)
Total recognized in other comprehensive (loss) income	14	(3)
Postemployment
Defined Benefit Plan Disclosure [Line Items]
Actuarial loss (gain) arising during the year	21	12
Amortization of loss included in net periodic benefit cost	(5)	(4)	$ (2)
Recognition of gain due to curtailment	0	0
Foreign currency exchange	0	0
Total recognized in other comprehensive (loss) income	$ 16	$ 8