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Income Taxes - Income Tax Expense (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Current
Federal	$ 132	$ 67	$ 74
State and local	2	7	9
Foreign	25	25	26
Deferred
Federal	(22)	7	(19)
State and local	(4)	1	(3)
Foreign	(8)	(11)	(17)
Total income tax expense	$ 125	$ 96	$ 70
Effective income tax rate	215.50%	43.40%	(48.60%)

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Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

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