Retirement Plans (Tables)

6 Months Ended

Jun. 30, 2018

Compensation And Retirement Disclosure [Abstract]

Components of Net Periodic Pension Cost

Components of net periodic pension cost consisted of the following:

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2018			2017			2018			2017
	(In millions)
Service cost	$	10		$	14		$	24		$	28
Interest cost		24			26			47			52
Expected return on plan assets		(49	)		(42	)		(98	)		(83	)
Amortization of unrecognized net actuarial losses		9			16			21			33
Curtailment gains		—			—			(2	)		—
Settlement loss		—			7			—			7
Pension (income) expense	$	(6	)	$	21		$	(8	)	$	37