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Supplemental Cash Flow Information (Tables)
 6 Months Ended
Jun. 30, 2013
Supplemental Cash Flow Information [Abstract]  
Changes in current assets and current liabilities
In order to determine net cash provided by operating activities, net income is adjusted by, among other things, changes in current assets and current liabilities as follows (in millions):
 
Six Months Ended
June 30,
 
2013
 
2012
Decrease (increase) in current assets:
 
 
 
Receivables, net
$
412

 
$
1,927

Inventories
(824
)
 
198

Income taxes receivable
31

 
(79
)
Prepaid expenses and other
2

 
(15
)
Increase (decrease) in current liabilities:
 
 
 
Accounts payable
625

 
(1,413
)
Accrued expenses
(44
)
 
(60
)
Taxes other than income taxes
268

 
67

Income taxes payable
(26
)
 
(60
)
Changes in current assets and current liabilities
$
444

 
$
565
Cash flows related to interest and income taxes

Cash flows related to interest and income taxes were as follows (in millions):

 
Six Months Ended
June 30,
 
2013
 
2012
Interest paid in excess of amount capitalized
$
160

 
$
164

Income taxes paid, net
243

 
204