Employee Benefit Plans (Tables)

9 Months Ended

Sep. 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 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