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Discontinued Operations - Additional Information (Detail) $ in Millions	3 Months Ended	12 Months Ended
	Jun. 30, 2014 USD ($)	Dec. 31, 2015 Conspiracy	Dec. 31, 2014 USD ($)	Dec. 31, 2013 USD ($)	Jun. 30, 2015 USD ($)
Discontinued Operations And Disposal Groups [Abstract]
Loss from discontinued operations	$ 205		$ 205	$ 69
Number of resolved criminal counts of conspiracy to violate International Emergency Powers Act \| Conspiracy		1
Amount of fines, penalties and assessments					$ 233

Amount after tax of income (loss) from a discontinued operation attributable to the parent. Includes, but is not limited to, the income (loss) from operations during the phase-out period, gain (loss) on disposal, gain (loss) for reversal of write-down (write-down) to fair value, less cost to sell, and adjustments to a prior period gain (loss) on disposal.

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