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Equity (Tables)
 6 Months Ended
Jun. 30, 2016
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.
 
 
2016
 
2015
In millions (1)
 
Cash flow hedges
 
Retirement benefit plans
 
Total
 
Cash flow hedges
 
Retirement benefit plans
 
Total
For the three months ended June 30
 
 
 
 
 
 
 
 
 
 
 
 
As of beginning of period
 
$
(28
)
 
$
(185
)
 
$
(213
)
 
$
(4
)
 
$
(197
)
 
$
(201
)
OCI, before reclassifications
 
(12
)
 
—

 
(12
)
 
25

 
—

 
25

Amounts reclassified from accumulated OCI
 
2

 
2

 
4

 
3

 
4

 
7

Net current-period other comprehensive (loss) income
 
(10
)
 
2

 
(8
)
 
28

 
4

 
32

As of end of period
 
$
(38
)
 
$
(183
)
 
$
(221
)
 
$
24

 
$
(193
)
 
$
(169
)
For the six months ended June 30
 
 

 
 

 
 

 
 

 
 

 
 

As of beginning of period
 
$
2

 
$
(188
)
 
$
(186
)
 
$
(6
)
 
$
(200
)
 
$
(206
)
OCI, before reclassifications
 
(41
)
 
—

 
(41
)
 
27

 
—

 
27

Amounts reclassified from accumulated OCI
 
1

 
5

 
6

 
3

 
7

 
10

Net current-period other comprehensive (loss) income
 
(40
)
 
5

 
(35
)
 
30

 
7

 
37

As of end of period
 
$
(38
)
 
$
(183
)
 
$
(221
)
 
$
24

 
$
(193
)
 
$
(169
)
(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 periods presented.
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
In millions (1)
 
2016
 
2015
 
2016
 
2015
Cash flow hedges
 
 
 
 
 
 
 
 
Cost of goods sold (natural gas contracts)
 
$
(1
)
 
$
(3
)
 
$
(1
)
 
$
(4
)
Operation and maintenance expense (natural gas contracts)
 
—

 
(1
)
 
—

 
(1
)
Interest expense (interest rate contracts)
 
(1
)
 
—

 
—

 
1

Cash flow hedges, net of income tax
 
(2
)
 
(4
)
 
(1
)
 
(4
)
Less noncontrolling interest
 
—

 
(1
)
 
—

 
(1
)
Total cash flow hedges, net of income tax
 
(2
)
 
(3
)
 
(1
)
 
(3
)
Retirement benefit plans
 
 

 
 

 
 

 
 

Operation and maintenance expense (actuarial losses) (2)
 
(4
)
 
(6
)
 
(9
)
 
(11
)
Total retirement benefit plans
 
(4
)
 
(6
)
 
(9
)
 
(11
)
Income tax benefit
 
2

 
2

 
4

 
4

Total retirement benefit plans, net of income tax
 
(2
)
 
(4
)
 
(5
)
 
(7
)
Total reclassification for the period
 
$
(4
)
 
$
(7
)
 
$
(6
)
 
$
(10
)
(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 herein for additional details about net periodic benefit cost.