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Receivables (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 12 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Dec. 31, 2013
Receivables      
Trade accounts receivable $ 976 $ 1,008 $ 757
Less: allowances for doubtful accounts and discounts 40 42 39
Net trade receivables 936 966 718
Other receivables 211 193 225
Total 1,147 1,159 943
Amount of receivables sold $ 190 $ 90 $ 192