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Accumulated Other Comprehensive Income (Loss) - Impact and Location of AOCI Reclassifications in Consolidated Statements of Income (Detail) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items]
Other Expense									$ (8)	$ (6)	$ (8)
Income tax benefit									3	(125)	(96)
Net income (loss)	$ 15	$ 18	$ 4	$ (7)	$ (74)	$ 13	$ (4)	$ (2)	30	(67)	125
Amount Reclassified from of Accumulated Other Comprehensive Income
Defined Benefit Plan Disclosure [Line Items]
Other Expense									(6)	(5)	(4)
Income tax benefit									1	1	1
Net income (loss)									$ (5)	$ (4)	$ (3)

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