New Accounting Standard (Unaudited) (Tables)

9 Months Ended

Sep. 30, 2018

The impact of adopting this ASU for the three and nine months ended September 30, 2017, follows (in millions):



	Three Months Ended September 30, 2017
	Previously Reported		Impact of Adoption			Current Presentation
Production and delivery	$	2,802	$	(8	)	$	2,794
Total cost of sales	3,220		(8		)	3,212
Selling, general and administrative expenses	106		(2		)	104
Environmental obligations and shutdown costs	73		(1		)	72
Total costs and expenses	3,393		(11		)	3,382
Operating income	917		11			928
Other income (expense), net	2		(11		)	(9		)



	Nine Months Ended September 30, 2017
	Previously Reported		Impact of Adoption			Current Presentation
Production and delivery	$	7,497	$	(35	)	$	7,462
Total cost of sales	8,754		(35		)	8,719
Selling, general and administrative expenses	366		(4		)	362
Mining exploration and research expenses	61		(1		)	60
Environmental obligations and shutdown costs	81		(5		)	76
Total costs and expenses	9,196		(45		)	9,151
Operating income	2,166		45			2,211
Other income (expense), net	36		(45		)	(9		)

The impact of adopting this ASU for the nine months ended September 30, 2017, follows (in millions):



	Previously Reported			Impact of Adoption			Current Presentation
Accrued income taxes and changes in other tax payments included in cash flow from operating activities	$	399		$	(6	)	$	393
Net cash provided by operating activities	3,018			(6		)	3,012
Other, net included in cash flow from investing activities	(22		)	20			(2		)
Net cash used in investing activities	(974		)	20			(954		)
Net increase in cash, cash equivalents, restricted cash and restricted cash equivalents	757			14			771
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of year	4,245			158			4,403
Cash, cash equivalents, restricted cash and restricted cash equivalents at end of period	4,957			172			5,129