Employment Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2013

Pension Plans, Defined Benefit

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs

Components of the net cost for the periods presented below for certain employee benefit plans were as follows (in millions):

	Pension Benefits
	Three Months Ended June 30,
Net Cost	2013			2012
Service cost	$	11		$	9
Interest cost	23			25
Expected return on plan assets	(31		)	(29		)
Amortization of net loss	4			2
Net cost recognized	$	7		$	7

	Pension Benefits
	Six Months Ended June 30,
Net Cost	2013			2012
Service cost	$	23		$	19
Interest cost	45			50
Expected return on plan assets	(62		)	(59		)
Amortization of net loss	8			5
Net cost recognized	$	14		$	15

Other Postretirement Benefit Plans, Defined Benefit

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs

	Retiree Health and Welfare Benefits
	Three Months Ended June 30,
Net Cost	2013		2012
Service cost	$	1	$	1
Interest cost	3		3
Amortization of net loss	1		—
Net cost recognized	$	5	$	4

	Retiree Health and Welfare Benefits
	Six Months Ended June 30,
Net Cost	2013		2012
Service Cost	$	1	$	1
Interest cost	6		6
Amortization of net loss	2		1
Net cost recognized	$	9	$	8