Employment Benefit Plans (Tables)

3 Months Ended

Mar. 31, 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 March 31,
Net Cost	2013			2012
Service cost	$	12		$	10
Interest cost	22			25
Expected return on plan assets	(31		)	(30		)
Amortization of net loss	4			3
Net cost recognized	$	7		$	8

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 March 31,
Net Cost	2013		2012
Interest cost	$	3	$	3
Amortization of net loss	1		1
Net cost recognized	$	4	$	4