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Receivables (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Receivables    
Trade accounts receivable $ 757 $ 827
Less: allowances for doubtful accounts and discounts 39 41
Net trade receivables 718 786
Other receivables 225 182
Total 943 968
Amount of receivables sold $ 192 $ 141