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Equity (Tables)
 12 Months Ended
Dec. 31, 2015
Stockholders' Equity Note [Abstract]  
Schedule of Accumulated Other Comprehensive Income (Loss)
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.
Reclassification out of Accumulated Other Comprehensive Income
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.