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Accumulated Other Comprehensive Income (Tables)
 9 Months Ended
Sep. 30, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]  
Schedule of Accumulated Other Comprehensive Income
The following table presents the net of tax changes in Accumulated Other Comprehensive Income (AOCI) by component, excluding amounts attributable to noncontrolling interests:
 
Foreign Currency Translation Adjustments
 
Pension
and Post-retirement Benefit Plan Obligations
 
Gas Purchase Contract Hedges
 
Other
 
Total Accumulated Other Comprehensive Income (Loss)
 
(in millions)
June 30, 2016
$
425

 
$
(337
)
 
$
—

 
$
(2
)
 
$
86

Other AOCI activity
(78
)
 
5

 
—

 
—

 
(73
)
September 30, 2016
$
347

 
$
(332
)
 
$
—

 
$
(2
)
 
$
13

 
 
 
 
 
 
 
 
 
 
June 30, 2015
$
617

 
$
(338
)
 
$
—

 
$
(3
)
 
$
276

Other AOCI activity
(345
)
 
6

 
—

 
1

 
(338
)
September 30, 2015
$
272

 
$
(332
)
 
$
—

 
$
(2
)
 
$
(62
)
 
 
 
 
 
 
 
 
 
 
December 31, 2015
$
79

 
$
(346
)
 
$
(3
)
 
$
1

 
$
(269
)
Other AOCI activity
268

 
14

 
3

 
(3
)
 
282

September 30, 2016
$
347

 
$
(332
)
 
$
—

 
$
(2
)
 
$
13

 
 
 
 
 
 
 
 
 
 
December 31, 2014
$
1,016

 
$
(351
)
 
$
(3
)
 
$
—

 
$
662

Other AOCI activity
(744
)
 
19

 
3

 
(2
)
 
(724
)
September 30, 2015
$
272

 
$
(332
)
 
$
—

 
$
(2
)
 
$
(62
)