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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2015
Supplemental Cash Flow Information [Abstract]  
Schedule of cash flows, supplemental disclosures
Cash flows related to interest and income taxes paid were as follows (in millions):
 
Year Ended December 31,
 
2015
 
2014
 
2013
Interest paid in excess of amount capitalized
$
416

 
$
392

 
$
361

Income taxes paid, net
2,093

 
1,624

 
387

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,
 
2015
 
2014
 
2013
Decrease (increase) in current assets:
 
 
 
 
 
Receivables, net
$
1,294

 
$
2,753

 
$
(753
)
Inventories
(222
)
 
(1,014
)
 
(13
)
Income taxes receivable
(104
)
 
(23
)
 
10

Prepaid expenses and other
(45
)
 
(32
)
 
2

Increase (decrease) in current liabilities:
 
 
 
 
 
Accounts payable
(1,787
)
 
(3,149
)
 
977

Accrued expenses
(40
)
 
38

 
53

Taxes other than income taxes
(74
)
 
(64
)
 
337

Income taxes payable
(328
)
 
(319
)
 
309

Changes in current assets and current liabilities
$
(1,306
)
 
$
(1,810
)
 
$
922