Employee Benefits (Tables)

9 Months Ended

Sep. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Components of net periodic benefit (credit) cost for our retirement plans and postretirement plans

The components of net periodic benefit (credit) cost for our retirement plans and postretirement plans for the periods ended September 30 are as follows:

Retirement Plans

(in millions)	Three Months						Nine Months
	2016			2015			2016			2015
Service cost	$	1		$	2		$	2		$	4
Interest cost	19			24			59			72
Expected return on plan assets	(30		)	(32		)	(92		)	(95		)
Amortization of actuarial loss	4			5			12			15
Net periodic benefit (credit) cost	$	(6	)	$	(1	)	$	(19	)	$	(4	)

Postretirement Plans

(in millions)	Three Months					Nine Months
	2016			2015		2016			2015
Interest cost	1			1		2			2
Amortization of prior service credit / actuarial gain	(1		)	—		(1		)	—
Net periodic benefit (credit) cost	$	—		$	1	$	1		$	2