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Segment and Related Information (Tables)
 3 Months Ended
Mar. 31, 2016
Segment Reporting [Abstract]  
Reconciliation of Segments to Consolidated
Financial data for the segments and reconciliation to consolidated results for the periods ended March 31 are:
 
 
Three Months
 
 
2016
 
2015
Income Statement Data
 
 
 
 
Revenues from external customers (a)
 
 
 
 
East
 
$
1,096

 
$
1,047

West
 
77

 
44

Total
 
$
1,173

 
$
1,091

 
 
 
 
 
Operating Income (Loss)
 
 
 
 
East
 
$
392

 
$
231

West
 
(28
)
 
(1
)
Other
 
(53
)
 
(52
)
Total
 
$
311

 
$
178


Balance Sheet Data
 
March 31, 2016
 
December 31, 2015
Assets
 

 

East
 
$
10,950

 
$
11,430

West
 
1,240

 
1,231

Other (b)
 
405

 
148

Total Assets
 
$
12,595

 
$
12,809


(a)
Includes unrealized gains and losses from derivatives. See Note 13 for additional information.
(b)
Primarily consists of unallocated items, including cash and PP&E.