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Equity
 12 Months Ended
Dec. 31, 2015
Stockholders' Equity Note [Abstract]  
Equity
Equity
Preferred Securities
At December 31, 2015 and 2014, we had 10 million shares of authorized, unissued Class A junior participating preferred stock, no par value, and 10 million shares of authorized, unissued preferred stock, no par value.
Dividends
Our common shareholders may receive dividends when declared at the discretion of our Board of Directors. Dividends may be paid in cash, stock or other form of payment, and payment of future dividends will depend on our future earnings, cash flow, financial requirements and other factors.
Additionally, we derive a substantial portion of our consolidated assets, earnings and cash flow from the operation of regulated utility subsidiaries, whose legal authority to pay dividends or make other distributions to us is subject to regulation. As with most other companies, the payment of dividends is restricted by laws in the states where we conduct business. In certain cases, our ability to pay dividends to our common shareholders is limited by (i) our ability to pay our debts as they become due in the usual course of business and satisfy our obligations under certain financing agreements, including our debt-to-capitalization covenant, (ii) our ability to maintain total assets below total liabilities, and (iii) our ability to satisfy our obligations to any preferred shareholders.
Accumulated Other Comprehensive Loss
Our share of comprehensive income includes net income plus OCI (loss), which includes changes in fair value of certain derivatives designated as cash flow hedges, certain changes in pension and welfare benefit plans and reclassifications for amounts included in net income less net income, and OCI attributable to the noncontrolling interest. For more information on our derivative instruments, see Note 6. For more information on our pensions and retirement benefit obligations, see Note 7. Our OCI (loss) amounts are aggregated within accumulated other comprehensive loss on our Consolidated Balance Sheets. The following table provides changes in the components of our accumulated other comprehensive loss balances, net of the related income tax effects.
In millions (1)
 
Cash flow hedges
 
Retirement benefit plans
 
Total
Balance at December 31, 2012
 
$
(3
)
 
$
(215
)
 
$
(218
)
OCI, before reclassifications
 
1

 
66

 
67

Amounts reclassified from accumulated OCI
 
3

 
12

 
15

Balance at December 31, 2013
 
1

 
(137
)
 
(136
)
OCI, before reclassifications
 
(6
)
 
(71
)
 
(77
)
Amounts reclassified from accumulated OCI
 
(1
)
 
8

 
7

Balance at December 31, 2014
 
(6
)
 
(200
)
 
(206
)
OCI, before reclassifications
 
—

 
—

 
—

Amounts reclassified from accumulated OCI
 
8

 
12

 
20

Balance at December 31, 2015
 
$
2

 
$
(188
)
 
$
(186
)
(1)
All amounts are net of income taxes and noncontrolling interest. Amounts in parentheses indicate debits to accumulated other comprehensive loss.
The following table provides details of the reclassifications out of accumulated other comprehensive loss and the favorable (unfavorable) impact on net income for the years ended December 31.
 
 
December 31,
In millions (1)
 
2015
 
2014
Cash flow hedges
 
 
 
 
Cost of goods sold (natural gas contracts)
 
$
(10
)
 
$
4

Operation and maintenance expense (natural gas contracts)
 
(1
)
 
1

Interest expense (interest rate contracts)
 
2

 
—

Total before income tax
 
(9
)
 
5

Income tax
 
1

 
(2
)
Cash flow hedges, net of income tax
 
(8
)
 
3

Less noncontrolling interest
 
—

 
2

Total cash flow hedges, net of income tax
 
(8
)
 
1

Retirement benefit plans
 
 

 
 

Operation and maintenance expense (actuarial losses) (2) 
 
(22
)
 
(15
)
Operation and maintenance expense (prior service credits) (2)
 
2

 
2

Total before income tax
 
(20
)
 
(13
)
Income tax
 
8

 
5

Total retirement benefit plans, net of income tax
 
(12
)
 
(8
)
Total reclassification
 
$
(20
)
 
$
(7
)
(1)
Amounts in parentheses indicate debits, or reductions, to our net income and credits to accumulated other comprehensive loss. Except for retirement benefit plan amounts, the net income impacts are immediate.
(2)
Amortization of these accumulated other comprehensive loss components is included in the computation of net periodic benefit cost. See Note 7 for additional details about net periodic benefit cost.