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Receivables - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Jun. 30, 2012
Mar. 31, 2012
Sold receivables that remain uncollected $ 118  
Sale of customer receivables   304
Cash received for receivables   50
Deferred purchase price receivable   254
Additional funding received 100  
Purchase price receivable 141  
Accounts receivables 1,281  
Cash collections 990  
Maximum
    
Funding of customer receivables sold   250
Minimum
    
Funding of customer receivables sold   $ 50