Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 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 June 30:
Service cost	$	28		$	30		$	2		$	1
Interest cost	25			23			3			4
Expected return on plan assets	(34		)	(33		)	—			—
Amortization of:
Prior service credit	(6		)	(5		)	(4		)	(4		)
Net actuarial loss	15			9			—			—
Net periodic benefit cost	$	28		$	24		$	1		$	1
Six months ended June 30:
Service cost	$	55		$	60		$	4		$	3
Interest cost	49			46			7			8
Expected return on plan assets	(67		)	(66		)	—			—
Amortization of:
Prior service credit	(11		)	(10		)	(9		)	(9		)
Net actuarial loss	31			17			—			—
Net periodic benefit cost	$	57		$	47		$	2		$	2