Benefit Plans (Tables)

3 Months Ended

Mar. 31, 2015

Pension Plan [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

Net periodic pension cost consisted of the following:

	For the Three Months Ended March 31,
	2015			2014
	(in millions)
Service cost	$	21		$	17
Interest cost	84			86
Expected return on plan assets	(135		)	(130		)
Amortization:
Net loss	59			38
Prior service cost	2			3
Net periodic pension cost	$	31		$	14

Other Postretirement Benefit Plan, Defined Benefit [Member]

Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]

Schedule of Net Benefit Costs [Table Text Block]

Net postretirement health care costs consisted of the following:

	For the Three Months Ended March 31,
	2015			2014
	(in millions)
Service cost	$	4		$	4
Interest cost	26			27
Amortization:
Net loss	12			7
Prior service credit	(10		)	(11		)
Net postretirement health care costs	$	32		$	27