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Supplemental Cash Flow Information (Tables)
 6 Months Ended
Jun. 30, 2012
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,
 
2012
 
2011
Decrease (increase) in current assets:
 
 
 
Receivables, net
$
2,087

 
$
(1,422
)
Inventories
198

 
978

Income taxes receivable
(79
)
 
175

Prepaid expenses and other
(15
)
 
(3
)
Increase (decrease) in current liabilities:
 
 
 
Accounts payable
(1,413
)
 
1,147

Accrued expenses
(60
)
 
202

Taxes other than income taxes
67

 
(52
)
Income taxes payable
(60
)
 
122

Changes in current assets and current liabilities
$
725

 
$
1,147
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,
 
2012
 
2011
Interest paid in excess of amount capitalized
$
164

 
$
221

Income taxes paid, net
204

 
10