Employee Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2015

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

Periodic benefit cost related to our defined benefit plans, net

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 March 31:
Service cost	$	27		$	30		$	2		$	2
Interest cost	24			23			4			4
Expected return on plan assets	(33		)	(33		)	—			—
Amortization of:
Prior service credit	(5		)	(5		)	(5		)	(5		)
Net actuarial loss	16			8			—			—
Net periodic benefit cost	$	29		$	23		$	1		$	1