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Receivables (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Dec. 31, 2013
Receivables      
Trade accounts receivable $ 911 $ 903 $ 757
Less: allowances for doubtful accounts and discounts 39 41 39
Net trade receivables 872 862 718
Other receivables 206 185 225
Total 1,078 1,047 943
Amount of receivables sold $ 129 $ 116 $ 192