Pension Plans and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2016

Compensation and Retirement Disclosure [Abstract]

Components of Net Periodic Benefit Cost Table

The following summarizes the Company’s pension and other postretirement benefit cost:

	Pension Benefits						Other Benefits
millions	2016			2015			2016			2015
Three Months Ended June 30
Service cost	$	23		$	29		$	—		$	2
Interest cost	23			26			3			4
Expected return on plan assets	(24		)	(28		)	—			—
Amortization of net actuarial loss (gain)	10			13			—			—
Amortization of net prior service cost (credit)	—			—			(6		)	1
Settlement expense	24			—			—			—
Curtailment expense	—			—			3			—
Net periodic benefit cost	$	56		$	40		$	—		$	7
Six Months Ended June 30
Service cost	$	49		$	59		$	1		$	5
Interest cost	49			51			6			8
Expected return on plan assets	(51		)	(55		)	—			—
Amortization of net actuarial loss (gain)	18			26			—			—
Amortization of net prior service cost (credit)	—			—			(12		)	1
Settlement expense	24			—			—			—
Termination benefits expense	44			—			—			—
Curtailment expense	8			—			—			—
Net periodic benefit cost	$	141		$	81		$	(5	)	$	14