Supplemental Cash Flow Information (Tables)

12 Months Ended

Dec. 31, 2018

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,
	2018			2017			2016
Decrease (increase) in current assets:
Receivables, net	$	(457	)	$	(870	)	$	(1,531	)
Inventories	(197		)	(516		)	771
Prepaid expenses and other	(77		)	151			47
Increase (decrease) in current liabilities:
Accounts payable	304			1,842			1,556
Accrued expenses	(113		)	21			117
Taxes other than income taxes payable	(73		)	172			82
Income taxes payable	(684		)	489			(66		)
Changes in current assets and current liabilities	$	(1,297	)	$	1,289		$	976

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

	Year Ended December 31,
	2018		2017		2016
Interest paid in excess of amount capitalized	$	463	$	457	$	427
Income taxes paid, net	1,361		410		444