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Receivables - Additional Information (Detail)
 9 Months Ended 12 Months Ended
Mar. 31, 2012
USD ($)
Sep. 30, 2015
USD ($)
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 $ 361,000,000 $ 356,000,000
Amount of cash draws under arrangement   0  
Amount of cash repayments under arrangement   0  
Accounts receivables   22,990,000,000  
Cash collections of other receivables   22,379,000,000  
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