Employment Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2015

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	2015			2014
Service cost	$	12		$	10
Interest cost	23			24
Expected return on plan assets	(35		)	(34		)
Net cost recognized	$	—		$	—

Retiree Health and Welfare Benefits

Defined Benefit Plan Disclosure [Line Items]

Schedule of Net Benefit Costs

	Retiree Health and Welfare Benefits
	Three Months Ended March 31,
Net Cost	2015			2014
Interest cost	2			3
Amortization of prior service credits	(1		)	(1		)
Amortization of net loss	1			1
Net cost recognized	$	2		$	3