Employee Benefit Plans

9 Months Ended

Sep. 30, 2015

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

EMPLOYEE BENEFIT PLANS

7. EMPLOYEE BENEFIT PLANS

The components of net periodic benefit cost related to our defined benefit plans were as follows (in millions):

	Pension Plans						Other Postretirement Benefit Plans
	2015			2014			2015			2014
Three months ended September 30:
Service cost	$	27		$	30		$	2		$	3
Interest cost	24			23			4			4
Expected return on plan assets	(33		)	(34		)	—			—
Amortization of:
Prior service credit	(5		)	(6		)	(5		)	(5		)
Net actuarial (gain) loss	16			9			—			(1		)
Net periodic benefit cost	$	29		$	22		$	1		$	1
Nine months ended September 30:
Service cost	$	82		$	90		$	6		$	6
Interest cost	73			69			11			12
Expected return on plan assets	(100		)	(100		)	—			—
Amortization of:
Prior service credit	(16		)	(16		)	(14		)	(14		)
Net actuarial (gain) loss	47			26			—			(1		)
Net periodic benefit cost	$	86		$	69		$	3		$	3

We contributed $114 million and $31 million, respectively, to our pension plans and $11 million and $14 million, respectively, to our other postretirement benefit plans during the nine months ended September 30, 2015 and 2014. Of the $114 million contributed to our pension plans during the nine months ended September 30, 2015, $77 million was discretionary and was contributed during the third quarter of 2015.

As a result of the additional discretionary pension contributions discussed above, our expected contributions to our pension plans have increased to $124 million for 2015. Our anticipated contributions to our other postretirement benefit plans during 2015 have not changed from the amount previously disclosed in our financial statements for the year ended December 31, 2014.