Summary of Funded Status of Pension Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Retirement Benefits [Abstract]
Defined Benefit Plan, Accumulated Benefit Obligation	$ 916	$ 811
Assets for Plan Benefits, Defined Benefit Plan	(7)	(20)
Liability, Defined Benefit Plan, Current	(4)	(4)
Liability, Defined Benefit Plan, Noncurrent	(207)	(188)
Employee Benefit Plans [Abstract]
Benefit obligation at end of prior year	821	722
Service cost	5	5	$ 6
Interest cost	17	21	19
Actuarial loss	84	87
Defined Benefit Plan, Benefit Obligation, Foreign Currency Translation Gain (Loss)	26	13
Benefit obligation at end of current year	926	821	722
Fair value of assets at end of prior year	649	549
Actual return on plan assets	71	91
Employer contributions	14	21
Defined Benefit Plan, Plan Assets, Foreign Currency Translation Gain (Loss)	14	14
Net benefits paid	(26)	(26)
Fair value of assets at end of current year	722	649	549
Total unfunded status at end of year (recognized in other non-current liabilities in the Consolidated Balance Sheets)	(204)	(172)
Defined Benefit Plan, Expected Return (Loss) on Plan Assets	31	30	33
Defined Benefit Plan Amortization Of Unrecognized Amounts	9	7	7
Defined Benefit Plan, Net Periodic Benefit Cost (Credit)	0	3	$ (1)
Defined Benefit Plan, Benefit Obligation, Benefits Paid	27	27
Defined Benefit Plan, Pension Plan with Projected Benefit Obligation in Excess of Plan Assets, Plan Assets	307	276
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation	$ 518	$ 466