Retirement Plans (Tables)

9 Months Ended

Sep. 30, 2016

Compensation And Retirement Disclosure [Abstract]

Schedule Of Net Periodic Benefit Cost For Pension And Postretirement Benefit Plans

	Pension Benefits												Postretirement Benefits
	Three Months Ended						Nine Months Ended						Three Months Ended				Nine Months Ended
	September 30,						September 30,						September 30,				September 30,
	2016			2015			2016			2015			2016		2015		2016			2015
	(Millions)
Service cost	$	3		$	9		$	12		$	25		$	—	$	—	$	—		$	—
Interest cost		9			13			32			39			—		—		—			—
Expected return on plan assets		(14	)		(14	)		(40	)		(44	)		—		—		—			—
Amortization of prior service cost (1)		1			1			2			3			—		—		(1	)		(1	)
Net actuarial loss (1)		6			5			19			15			—		—		—			—
Net periodic benefit cost (2)	$	5		$	14		$	25		$	38		$	—	$	—	$	(1	)	$	(1	)

(1) These net periodic benefit costs were reclassified out of other comprehensive earnings in the current period.

(2) Net periodic benefit cost is a component of G&A in the accompanying consolidated comprehensive statements of earnings.