Receivables - Additional Information (Detail) (USD $) In Millions, unless otherwise specified	1 Months Ended	6 Months Ended
	Mar. 31, 2012	Jun. 30, 2014 Agreement
Schedule Of Financial Receivables [Line Items]
Number of arrangement with different financial institution to sell customer receivables		3
Net cash funding received in current period		$ 150
Deferred purchase price receivable	254	268
Net cash funding received		360
Amount of cash draws under arrangement		848
Amount of cash repayments under arrangement		488
Accounts receivables		13,921
Cash collections		13,293
Minimum [Member]
Schedule Of Financial Receivables [Line Items]
Funding of customer receivables sold		50
Maximum [Member]
Schedule Of Financial Receivables [Line Items]
Funding of customer receivables sold		$ 500