Other Comprehensive Income

3 Months Ended

Mar. 31, 2018

Stockholders' Equity Note [Abstract]

Other Comprehensive Income

Other Comprehensive Loss

Changes in accumulated other comprehensive loss, net of tax, for the three months ended March 31, 2018 and 2017 were as follows:

	Three Months Ended March 31, 2018
(Millions of Dollars)	Gains and Losses on Cash Flow Hedges			Defined Benefit Pension and Postretirement Items			Total
Accumulated other comprehensive loss at Jan. 1	$	(58	)	$	(67	)	$	(125	)
Losses reclassified from net accumulated other comprehensive loss	—			1			1
Net current period other comprehensive income	—			1			1
Accumulated other comprehensive loss at March 31	$	(58	)	$	(66	)	$	(124	)

	Three Months Ended March 31, 2017
(Millions of Dollars)	Gains and Losses on Cash Flow Hedges			Defined Benefit Pension and Postretirement Items			Total
Accumulated other comprehensive loss at Jan. 1	$	(51	)	$	(59	)	$	(110	)
Losses reclassified from net accumulated other comprehensive loss	1			1			2
Net current period other comprehensive income	1			1			2
Accumulated other comprehensive loss at March 31	$	(50	)	$	(58	)	$	(108	)

Reclassifications from accumulated other comprehensive loss for the three months ended March 31, 2018 and 2017 were as follows:

(Millions of Dollars)	Amounts Reclassifiedfrom Accumulated Other ComprehensiveLoss
	Three Months Ended March 31, 2018			Three Months Ended March 31, 2017
Losses on cash flow hedges:
Interest rate derivatives	$	—	(a)	$	1		(a)
Total, net of tax	—			1
Defined benefit pension and postretirement losses:
Amortization of net loss	1		(b)	2			(b)
Total, pre-tax	1			2
Tax benefit	—			(1		)
Total, net of tax	1			1
Total amounts reclassified, net of tax	$	1		$	2

^(a)  Included in interest charges

^(b)  Included in the computation of net periodic pension and postretirement benefit costs. See Note 12 for details regarding these benefit plans.