Accumulated Other Comprehensive (Loss) Income - Changes in Accumulated Other Comprehensive Income (AOCI) (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	$ 262	$ 495	$ 668
Other comprehensive loss	(2)	(40)	(27)
Ending balance	400	262	495
Derivatives
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(15)	(6)	0
Other comprehensive (loss) income before reclassifications	(6)	(9)	(6)
Amounts reclassified from AOCI	0	0	0
Other comprehensive loss	(6)	(9)	(6)
Ending balance	(21)	(15)	(6)
Defined  benefit plans
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(65)	(44)	(36)
Other comprehensive (loss) income before reclassifications	(12)	(27)	(13)
Amounts reclassified from AOCI	9	6	5
Other comprehensive loss	(3)	(21)	(8)
Ending balance	(68)	(65)	(44)
Foreign  currency translation adjustments
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(61)	(51)	(38)
Other comprehensive (loss) income before reclassifications	7	(10)	(13)
Amounts reclassified from AOCI	0	0	0
Other comprehensive loss	7	(10)	(13)
Ending balance	(54)	(61)	(51)
Total  AOCI
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Beginning balance	(141)	(101)	(74)
Other comprehensive (loss) income before reclassifications	(11)	(46)	(32)
Amounts reclassified from AOCI	9	6	5
Other comprehensive loss	(2)	(40)	(27)
Ending balance	$ (143)	$ (141)	$ (101)