Employee Benefit Plans (Tables)

6 Months Ended

Jun. 30, 2016

Defined Benefit Pension Plans and Defined Benefit Postretirement Plans Disclosure [Abstract]

Periodic benefit cost related to our defined benefit plans, net

The components of net periodic benefit cost related to our defined benefit plans were as follows (in millions):

	Pension Plans						Other Postretirement Benefit Plans
	2016			2015			2016			2015
Three months ended June 30:
Service cost	$	28		$	28		$	1		$	2
Interest cost	21			25			3			3
Expected return on plan assets	(34		)	(34		)	—			—
Amortization of:
Prior service credit	(5		)	(6		)	(4		)	(4		)
Net actuarial loss	12			15			—			—
Net periodic benefit cost	$	22		$	28		$	—		$	1
Six months ended June 30:
Service cost	$	56		$	55		$	3		$	4
Interest cost	42			49			6			7
Expected return on plan assets	(69		)	(67		)	—			—
Amortization of:
Prior service credit	(10		)	(11		)	(8		)	(9		)
Net actuarial loss	24			31			—			—
Net periodic benefit cost	$	43		$	57		$	1		$	2