Pension Plans and Other Postretirement Benefits (Tables)

3 Months Ended

Mar. 31, 2015

Compensation and Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Cost Table

The following summarizes the Company’s pension and other postretirement benefit cost:

	Pension Benefits						Other Benefits
millions	2015			2014			2015		2014
Three Months Ended March 31
Service cost	$	30		$	25		$	3	$	2
Interest cost	25			25			4		4
Expected return on plan assets	(27		)	(27		)	—		—
Amortization of net actuarial loss (gain)	13			9			—		(2		)
Net periodic benefit cost	$	41		$	32		$	7	$	4