Receivables - Additional Information (Detail)		6 Months Ended	12 Months Ended
	Mar. 31, 2012 USD ($)	Jun. 30, 2015 USD ($) Agreement	Dec. 31, 2014 USD ($)
Schedule Of Financial Receivables [Line Items]
Number of arrangement with different financial institution to sell customer receivables | Agreement		3
Deferred purchase price receivable	$ 254,000,000	$ 401,000,000	$ 356,000,000
Amount of cash draws under arrangement		0
Amount of cash repayments under arrangement		0
Accounts receivables		21,320,000,000
Cash collections of other receivables		20,669,000,000
Predecessor [Member]
Schedule Of Financial Receivables [Line Items]
Net cash funding received		250,000,000
Amount of cash draws under arrangement		1,308,000,000
Amount of cash repayments under arrangement		1,058,000,000
Minimum [Member]
Schedule Of Financial Receivables [Line Items]
Funding of customer receivables sold		200,000,000
Maximum [Member]
Schedule Of Financial Receivables [Line Items]
Funding of customer receivables sold		$ 500,000,000