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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 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):
 
Year Ended December 31,
 
2013
 
2012
 
2011
Decrease (increase) in current assets:
 
 
 
 
 
Receivables, net
$
(753
)
 
$
437

 
$
(3,110
)
Inventories
(13
)
 
(282
)
 
643

Income taxes receivable
10

 
51

 
128

Prepaid expenses and other
2

 
(28
)
 
(2
)
Increase (decrease) in current liabilities:
 
 
 
 
 
Accounts payable
977

 
(113
)
 
2,004

Accrued expenses
53

 
13

 
(18
)
Taxes other than income taxes
337

 
(260
)
 
312

Income taxes payable
309

 
(120
)
 
124

Changes in current assets and current liabilities
$
922

 
$
(302
)
 
$
81
Cash flows related to interest and income taxes paid
Cash flows related to interest and income taxes paid were as follows (in millions):
 
Year Ended December 31,
 
2013
 
2012
 
2011
Interest paid in excess of amount capitalized
$
361

 
$
302

 
$
397

Income taxes paid, net
387

 
705

 
486