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Supplemental Cash Flow Information (Tables)
 12 Months Ended
Dec. 31, 2017
Supplemental Cash Flow Information [Abstract]  
Schedule of cash flows, supplemental disclosures
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,
 
2017
 
2016
 
2015
Decrease (increase) in current assets:
 
 
 
 
 
Receivables, net
$
(870
)
 
$
(1,531
)
 
$
1,294

Inventories
(516
)
 
771

 
(222
)
Prepaid expenses and other
151

 
47

 
(149
)
Increase (decrease) in current liabilities:
 
 
 
 
 
Accounts payable
1,842

 
1,556

 
(1,787
)
Accrued expenses
21

 
117

 
(40
)
Taxes other than income taxes payable
172

 
82

 
(74
)
Income taxes payable
489

 
(66
)
 
(328
)
Changes in current assets and current liabilities
$
1,289

 
$
976

 
$
(1,306
)


Cash flows related to interest and income taxes were as follows (in millions):
 
Year Ended December 31,
 
2017
 
2016
 
2015
Interest paid in excess of amount capitalized
$
457

 
$
427

 
$
416

Income taxes paid, net
410

 
444

 
2,093