Shareholders' Equity (Tables)

3 Months Ended

Mar. 31, 2015

Changes in accumulated other comprehensive loss

The changes in accumulated other comprehensive loss, presented net of tax, were as follows (in millions):

	Three months ended March 31, 2015								Three months ended March 31, 2014
	Defined benefit pension plans			Derivative instruments		Total			Defined benefit pension plans			Derivative instruments			Total
Balance, beginning of period	$	(404	)	$	—	$	(404	)	$	(264	)	$	2		$	(262	)
Other comprehensive loss before reclassifications	(11		)	—		(11		)	(5		)	—			(5		)
Reclassifications to net income	1			—		1			6			(2		)	4
Other comprehensive income (loss), net	(10		)	—		(10		)	1			(2		)	(1		)
Balance, end of period	$	(414	)	$	—	$	(414	)	$	(263	)	$	—		$	(263	)

Schedule of significant reclassifications from accumulated other comprehensive income to net income

Significant reclassifications from accumulated other comprehensive income to net income included the following (in millions):

		Three months ended March 31,
	Statement of operations classification	2015			2014
Defined benefit pension plans
Actuarial losses		$	5		$	6
Total amortization, before income taxes	Net periodic benefit costs (a)	5			6
Income tax benefit	Income tax expense	(4		)	—
Total amortization, net of income taxes		$	1		$	6

(a)

We recognize the amortization of accumulated other comprehensive income components related to defined benefit pension plans in net periodic benefit costs. In the three months ended March 31, 2015, our net periodic benefit costs included $4 million and $1 million, recorded in operating and maintenance costs and general and administrative costs, respectively. In the three months ended March 31, 2014, our net periodic benefit costs included $4 million and $2 million, recorded in operating and maintenance costs and general and administrative costs, respectively. See Note 12—Postemployment Benefit Plans.