Pension Plans and Other Postretirement Benefits

9 Months Ended

Sep. 30, 2015

Compensation and Retirement Disclosure [Abstract]

Pension Plans and Other Postretirement Benefits

16. Pension Plans and Other Postretirement Benefits

The Company has contributory and non-contributory defined-benefit pension plans, which include both qualified and supplemental plans. The Company also provides certain health care and life insurance benefits for certain retired employees. Retiree health care benefits are funded by contributions from the retiree, and in certain circumstances, contributions from the Company. The Company’s retiree life insurance plan is noncontributory. The following summarizes the Company’s pension and other postretirement benefit cost:

	Pension Benefits						Other Benefits
millions	2015			2014			2015		2014
Three Months Ended September 30
Service cost	$	30		$	25		$	3	$	1
Interest cost	25			25			3		4
Expected return on plan assets	(27		)	(27		)	—		—
Amortization of net actuarial loss (gain)	13			9			—		(2		)
Amortization of net prior service cost (credit)	—			—			1		—
Net periodic benefit cost	$	41		$	32		$	7	$	3
Nine Months Ended September 30
Service cost	$	89		$	74		$	8	$	5
Interest cost	76			75			11		11
Expected return on plan assets	(82		)	(80		)	—		—
Amortization of net actuarial loss (gain)	39			26			—		(5		)
Amortization of net prior service cost (credit)	—			—			2		—
Net periodic benefit cost	$	122		$	95		$	21	$	11