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Receivables - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 1 Months Ended 3 Months Ended
Mar. 31, 2012
Mar. 31, 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   $ 100
Deferred purchase price receivable 254 315
Net cash funding received   310
Amount of cash draws under arrangement   698
Amount of cash repayments under arrangement   388
Accounts receivables   12,064
Cash collections   11,439
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