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Debt - Additional Information (Detail) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2017
Debt Instrument Redemption [Line Items]
Terminated interest rate swaps	terminated interest rate swaps with a notional amount of $350 million
Amount of terminated interest rate swaps		$ 350
Loss on debt extinguishment	$ 0	27
Revolving Credit Facility
Debt Instrument Redemption [Line Items]
Borrowing from revolving credit line	$ 199
Other Notes
Debt Instrument Redemption [Line Items]
Carrying value of purchased debt			$ 38
8.125% Notes Due 2019
Debt Instrument Redemption [Line Items]
Debt instrument redemption amount		415
Debt instrument redemption of principal amount		$ 350
Debt instrument interest rate		8.125%
Debt instrument maturity year		2019
Carrying value of purchased debt			$ 349