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Property, Plant and Equipment (Narrative) (Details) - Dominion Gas Holdings, LLC - Oil and Gas Properties
a in Thousands, $ in Millions
1 Months Ended 3 Months Ended 12 Months Ended
Apr. 30, 2016
USD ($)
a
Sep. 30, 2015
USD ($)
a
field
Mar. 31, 2015
USD ($)
a
natural_gas_producer
field
Nov. 30, 2014
USD ($)
a
field
Dec. 31, 2013
USD ($)
a
natural_gas_producer
Sep. 30, 2015
USD ($)
a
field
Mar. 31, 2015
USD ($)
a
field
Dec. 31, 2016
USD ($)
a
Dec. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
a
Property, Plant and Equipment [Line Items]                    
After tax gain on sale           $ 29 $ 43      
Marcellus Shale                    
Property, Plant and Equipment [Line Items]                    
Number of natural gas producers | natural_gas_producer         2          
Development rights (in acres) | a     11 24 100   11 4   100
Amount of consideration       $ 120 $ 200     $ 10   $ 200
Period for payments related to conveyance of natural gas storage fields       4 years 9 years          
Proceeds from assignment of Shale Development Rights     $ 27 $ 60         $ 16 100
Number of natural gas storage fields | field     1 1     1      
Number of acres included in initial conveyance | a       12            
Marcellus Shale | Amended Agreement to Extend Conveyance of Development Rights                    
Property, Plant and Equipment [Line Items]                    
Number of natural gas producers | natural_gas_producer     1              
Development rights (in acres) | a 70   9       9      
Period for payments related to conveyance of natural gas storage fields     2 years              
Partial interest percentage conveyed 32.00%                  
Marcellus Shale | Other operations and maintenance expense                    
Property, Plant and Equipment [Line Items]                    
Gain from sale     $ 27 $ 60       10   20
After tax gain on sale     16 $ 36       $ 6   $ 12
Marcellus Shale | Other operations and maintenance expense | Amended Agreement to Extend Conveyance of Development Rights                    
Property, Plant and Equipment [Line Items]                    
Revenue recognized $ 35   43              
Revenue recognized net of tax $ 21   $ 27              
Utica and Point Pleasant Shale                    
Property, Plant and Equipment [Line Items]                    
Development rights (in acres) | a   16       16        
Amount of consideration   $ 52       $ 52        
Proceeds from assignment of Shale Development Rights   $ 52                
Number of natural gas storage fields | field   1       1        
Utica and Point Pleasant Shale | Other operations and maintenance expense                    
Property, Plant and Equipment [Line Items]                    
Gain from sale   $ 52                
After tax gain on sale   $ 29