Employee Benefit Plans (Tables)

9 Months Ended

Sep. 30, 2013

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
	2013			2012			2013			2012
Three months ended September 30:
Service cost	$	34		$	35		$	3		$	3
Interest cost	21			23			4			5
Expected return on plan assets	(33		)	(31		)	—			—
Amortization of:
Net actuarial loss	14			8			—			—
Prior service cost (credit)	(5		)	1			(4		)	(6		)
Net periodic benefit cost	$	31		$	36		$	3		$	2
Nine months ended September 30:
Service cost	$	105		$	105		$	9		$	9
Interest cost	65			69			13			16
Expected return on plan assets	(99		)	(93		)	—			—
Amortization of:
Net actuarial loss	43			25			—			—
Prior service cost (credit)	(14		)	2			(10		)	(17		)
Net periodic benefit cost	$	100		$	108		$	12		$	8