Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Schedule of Net Benefit Costs

Following are the components of our welfare costs for the periods indicated.

	Three Months Ended September 30,						Nine Months Ended September 30,
In millions	2015			2014			2015			2014
Service cost	$	—		$	1		$	1		$	2
Interest cost	4			4			10			11
Expected return on plan assets	(1		)	(2		)	(5		)	(5		)
Net amortization of prior service credit	(1		)	(1		)	(2		)	(2		)
Recognized actuarial loss	1			1			4			4
Net periodic welfare benefit cost	$	3		$	3		$	8		$	10

Following are the components of our pension costs for the periods indicated.

	Three Months Ended September 30,						Nine Months Ended September 30,
In millions	2015			2014			2015			2014
Service cost	$	7		$	6		$	21		$	18
Interest cost	11			12			34			35
Expected return on plan assets	(16		)	(16		)	(49		)	(48		)
Net amortization of prior service credit	(1		)	(1		)	(2		)	(2		)
Recognized actuarial loss	8			5			23			16
Net periodic pension benefit cost	$	9		$	6		$	27		$	19