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Receivables, Net (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2012
Dec. 31, 2011
Receivables, Net    
Trade accounts receivable $ 437 $ 361
Notes receivable 4 7
Other 46 41
Receivables, gross 487 409
Allowance for doubtful accounts (13) (13)
Receivables, net $ 474 $ 396