Pension Plans and Other Postretirement Benefits (Tables)

6 Months Ended

Jun. 30, 2018

Retirement Benefits [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	2018			2017			2018			2017
Three Months Ended June 30
Service cost	$	22		$	21		$	1		$	1
Interest cost	19			21			2			3
Expected (return) loss on plan assets	(20		)	(21		)	—			—
Amortization of net actuarial loss (gain)	6			7			—			—
Amortization of net prior service cost (credit)	—			—			(6		)	(6		)
Settlement expense	—			55			—			—
Net periodic benefit cost (1)	$	27		$	83		$	(3	)	$	(2	)
Six Months Ended June 30
Service cost	$	45		$	42		$	1		$	1
Interest cost	38			42			5			6
Expected (return) loss on plan assets	(41		)	(42		)	—			—
Amortization of net actuarial loss (gain)	13			13			—			—
Amortization of net prior service cost (credit)	—			—			(12		)	(12		)
Settlement expense	—			58			—			—
Termination benefits expense	—			4			—			—
Net periodic benefit cost (1)	$	55		$	117		$	(6	)	$	(5	)

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⁽¹⁾  The service cost component of net periodic benefit cost is included in G&A; oil and gas operating expense; gathering, processing, and marketing expense; and exploration expense, and all other components of net periodic benefit cost are included in other (income) expense on the Company’s Consolidated Statements of Income.