Recent Accounting Pronouncements - Recent Accounting Pronouncements (Tables)

12 Months Ended

Dec. 31, 2017

Accounting Changes and Error Corrections [Abstract]

Changes in presentation of net benefit costs

Select line items from our consolidated statements of income for the years ended December 31, 2017 and 2016 which reflect the changes in presentation of net benefit costs are as follows:

(millions)	Year ended December 31, 2017				Year ended December 31, 2016
	After Adoption		As Reported		After Adoption			As Reported
Gross profit	$	656	$	665	$	700		$	705
Operating profit	353		367		396			394
Other net periodic postretirement benefit (costs)	14		—		(2		)	—
Net income	88		88		510			510