Employment Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2016

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	2016			2015
Service cost	$	12		$	12
Interest cost	24			23
Expected return on plan assets	(36		)	(35		)
Net cost recognized	$	—		$	—

	Retiree Health and Welfare Benefits
	Three Months Ended March 31,
Net Cost	2016		2015
Interest cost	$	3	$	2
Amortization of prior service credits	—		(1		)
Amortization of net loss	—		1
Net cost recognized	$	3	$	2