Employee Benefit Plans - Change in Benefit Obligation, Plan Assets and Funded Status of Defined Benefit Pension Plans (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Defined Benefit Plan Disclosure [Line Items]
Fair value of plan assets at beginning of year	$ 568
Fair value of plan assets at end of year	582	$ 568
Pension Plan
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	600	575
Service cost	1	1
Interest cost	14	18
Actuarial loss (gain)	54	42
Benefits paid	(29)	(29)
Exchange rate loss (gain)	17	5
Settlements	(16)	(12)
Benefit obligation at end of year	641	600
Fair value of plan assets at beginning of year	568	517
Actual return	43	80
Benefits paid	(29)	(29)
Company contributions	5	5
Exchange rate gain (loss)	13	6
Settlements	(16)	(11)
Fair value of plan assets at end of year	584	568
Funded status	(57)	(32)
Accumulated benefit obligation at end of year	637	597
Other Postretirement Benefits Plan
Defined Benefit Plan Disclosure [Line Items]
Benefit obligation at beginning of year	53	45
Interest cost		2
Actuarial loss (gain)	5	(15)
Benefits paid	(17)	(11)
Participants contributions	2	2
Special events		30
Benefit obligation at end of year	43	53
Benefits paid	(17)	(11)
Company contributions	15	9
Participants contributions	2	2
Funded status	$ (43)	$ (53)