Interest Expense (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Interest Expense

Interest expense includes interest and the amortization of deferred financing fees and debt discounts, less amounts capitalized, as follows:

(In millions)	2017			2016			2015
Interest expense before capitalization	$	358		$	398		$	457
Capitalized interest	(23		)	(26		)	(19		)
	$	335		$	372		$	438