Benefit Plans (Tables)

6 Months Ended

Jun. 30, 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 Six Months Ended June 30,						For the Three Months Ended June 30,
	2015			2014			2015			2014
	(in millions)
Service cost	$	43		$	34		$	22		$	17
Interest cost	168			172			84			86
Expected return on plan assets	(270		)	(260		)	(135		)	(130		)
Amortization:
Net loss	117			75			58			37
Prior service cost	4			5			2			2
Net periodic pension cost	$	62		$	26		$	31		$	12

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 Six Months Ended June 30,						For the Three Months Ended June 30,
	2015			2014			2015			2014
	(in millions)
Service cost	$	9		$	8		$	5		$	4
Interest cost	51			54			25			27
Amortization:
Net loss	23			14			11			7
Prior service credit	(20		)	(21		)	(10		)	(10		)
Net postretirement health care costs	$	63		$	55		$	31		$	28