XML 73 R51.htm IDEA: XBRL DOCUMENT v3.7.0.1
Accumulated Other Comprehensive Income (Schedule of Reclassifications out of AOCI by Component Net of Tax) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2017
Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Operating revenue $ (3,384) $ (2,921)
Purchased gas 305 119
Electric fuel and other energy-related purchases 575 634
Interest and related charges 292 226
Other income (116) (54)
Income from operations including noncontrolling interests before income tax expense (949) (710)
Income tax expense 275 179
Other operations and maintenance 738 703
Dominion Gas Holdings, LLC    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Operating revenue [1] (490) (431)
Purchased gas [1] 43 34
Interest and related charges [1] 23 22
Other income (5) 0
Income from operations including noncontrolling interests before income tax expense (165) (159)
Income tax expense 57 61
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Income from operations including noncontrolling interests before income tax expense (37) (102)
Income tax expense 14 39
Income from continuing operations including noncontrolling interests (23) (63)
Deferred (gains) and losses on derivatives-hedging activities: | Amounts Reclassified From AOCI | Dominion Gas Holdings, LLC    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Income from operations including noncontrolling interests before income tax expense 18 (4)
Income tax expense (7) 2
Income from continuing operations including noncontrolling interests 11 (2)
Deferred (gains) and losses on derivatives-hedging activities: | Commodity contracts | Amounts Reclassified From AOCI    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Operating revenue (62) (114)
Purchased gas (1) 6
Electric fuel and other energy-related purchases 1 3
Deferred (gains) and losses on derivatives-hedging activities: | Commodity contracts | Amounts Reclassified From AOCI | Dominion Gas Holdings, LLC    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Operating revenue 3 (4)
Deferred (gains) and losses on derivatives-hedging activities: | Interest rate contracts | Amounts Reclassified From AOCI    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Interest and related charges 11 3
Deferred (gains) and losses on derivatives-hedging activities: | Interest rate contracts | Amounts Reclassified From AOCI | Dominion Gas Holdings, LLC    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Interest and related charges 1  
Deferred (gains) and losses on derivatives-hedging activities: | Foreign currency | Amounts Reclassified From AOCI    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other income 14  
Deferred (gains) and losses on derivatives-hedging activities: | Foreign currency | Amounts Reclassified From AOCI | Dominion Gas Holdings, LLC    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other income 14  
Unrealized (gains) and losses on investment securities: | Amounts Reclassified From AOCI    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Realized (gain) loss on sale of securities (53) (10)
Impairment 9 7
Income from operations including noncontrolling interests before income tax expense (44) (3)
Income tax expense 16 1
Income from continuing operations including noncontrolling interests (28) (2)
Unrecognized pension and other postretirement benefit costs:    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Unrecognized pension and other postretirement benefit costs, before tax 21 14
Unrecognized pension and other postretirement benefit costs, income tax expense (8) (6)
Unrecognized pension and other postretirement benefit costs, net of tax 13 8
Unrecognized pension and other postretirement benefit costs: | Dominion Gas Holdings, LLC    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Unrecognized pension and other postretirement benefit costs, before tax 1 1
Unrecognized pension and other postretirement benefit costs, income tax expense (1) (1)
Unrecognized pension and other postretirement benefit costs, net of tax 0 0
Prior service (credit) costs | Amounts Reclassified From AOCI    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other operations and maintenance (4) (3)
Actuarial (gains) losses | Amounts Reclassified From AOCI    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other operations and maintenance 25 17
Actuarial (gains) losses | Amounts Reclassified From AOCI | Dominion Gas Holdings, LLC    
Accumulated Other Comprehensive Income (Loss) [Line Items]    
Other operations and maintenance $ 1 $ 1
[1] See Note 17 for amounts attributable to related parties.