Accumulated Other Comprehensive Income (Loss) - Components of Accumulated Other Comprehensive Loss (Detail) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 4,011	$ 3,516	$ 3,900	$ 4,996
Total other comprehensive income (loss), net of tax	(34)	18	(27)	(68)
Ending balance	4,057	3,750	4,057	3,750
Cumulative Translation Adjustment
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(481)
Other comprehensive income (loss) before reclassifications			(65)
Amounts reclassified to earnings			0
Total other comprehensive income (loss), net of tax			(65)
Ending balance	(546)		(546)
Pension and  Postretirement Costs
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(356)
Other comprehensive income (loss) before reclassifications			2
Amounts reclassified to earnings			13
Total other comprehensive income (loss), net of tax			15
Ending balance	(341)		(341)
Derivative Financial Instruments
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance			(43)
Other comprehensive income (loss) before reclassifications			8
Amounts reclassified to earnings			15
Total other comprehensive income (loss), net of tax			23
Ending balance	(20)		(20)
AOCL
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(873)	(1,006)	(880)	(920)
Other comprehensive income (loss) before reclassifications			(55)
Amounts reclassified to earnings			28
Total other comprehensive income (loss), net of tax			(27)
Ending balance	$ (907)	$ (988)	$ (907)	$ (988)