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Equity (Schedule of Components of Accumulated Other Comprehensive Income) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance |  | $ 12,664 |  |
Other comprehensive income (loss) |  | (325) | $ (58) | $ (92)
Ending balance |  | 14,605 | 12,664 |
Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance |  | (474) | (416) |
Other comprehensive income before reclassifications: gains (losses) |  | (172) | 49 |
Amounts reclassified from accumulated other comprehensive income: (gains) losses | [1] | (153) | (107) |
Other comprehensive income (loss) |  | (325) | (58) | (92)
Ending balance |  | (799) | (474) | (416)
Deferred gains and losses on derivatives-hedging activities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance |  | (176) | (178) |
Other comprehensive income before reclassifications: gains (losses) |  | 55 | 110 |
Amounts reclassified from accumulated other comprehensive income: (gains) losses | [1] | (159) | (108) |
Other comprehensive income (loss) |  | (104) | 2 |
Ending balance |  | (280) | (176) | (178)
Unrealized gains and losses on investment securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance |  | 504 | 548 |
Other comprehensive income before reclassifications: gains (losses) |  | 93 | 6 |
Amounts reclassified from accumulated other comprehensive income: (gains) losses | [1] | (28) | (50) |
Other comprehensive income (loss) |  | 65 | (44) |
Ending balance |  | 569 | 504 | 548
Unrecognized pension and other postretirement benefit costs |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance |  | (797) | (782) |
Other comprehensive income before reclassifications: gains (losses) |  | (319) | (66) |
Amounts reclassified from accumulated other comprehensive income: (gains) losses | [1] | 34 | 51 |
Other comprehensive income (loss) |  | (285) | (15) |
Ending balance |  | (1,082) | (797) | (782)
Other comprehensive loss from equity method investees |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance |  | (5) | (4) |
Other comprehensive income before reclassifications: gains (losses) |  | (1) | (1) |
Amounts reclassified from accumulated other comprehensive income: (gains) losses | [1] | 0 | 0 |
Other comprehensive income (loss) |  | (1) | (1) |
Ending balance |  | (6) | (5) | (4)
Virginia Electric and Power Company |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance |  | 10,641 |  |
Other comprehensive income (loss) |  | 6 | (10) | 2
Ending balance |  | 11,865 | 10,641 |
Virginia Electric and Power Company | Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance |  | 40 | 50 |
Other comprehensive income before reclassifications: gains (losses) |  | 9 | (5) |
Amounts reclassified from accumulated other comprehensive income: (gains) losses | [2] | (3) | (5) |
Other comprehensive income (loss) |  | 6 | (10) | 2
Ending balance |  | 46 | 40 | 50
Virginia Electric and Power Company | Deferred gains and losses on derivatives-hedging activities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance |  | (7) | (7) |
Other comprehensive income before reclassifications: gains (losses) |  | (2) | (1) |
Amounts reclassified from accumulated other comprehensive income: (gains) losses | [2] | 1 | 1 |
Other comprehensive income (loss) |  | (1) | 0 |
Ending balance |  | (8) | (7) | (7)
Virginia Electric and Power Company | Unrealized gains and losses on investment securities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance |  | 47 | 57 |
Other comprehensive income before reclassifications: gains (losses) |  | 11 | (4) |
Amounts reclassified from accumulated other comprehensive income: (gains) losses | [2] | (4) | (6) |
Other comprehensive income (loss) |  | 7 | (10) |
Ending balance |  | 54 | 47 | 57
Dominion Gas Holdings, LLC |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance |  | 3,318 |  |
Other comprehensive income (loss) |  | (24) | (13) | (28)
Ending balance |  | 3,536 | 3,318 |
Dominion Gas Holdings, LLC | Accumulated Other Comprehensive Income (Loss) |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance |  | (99) | (86) |
Other comprehensive income before reclassifications: gains (losses) |  | (36) | (14) |
Amounts reclassified from accumulated other comprehensive income: (gains) losses | [3] | 12 | 1 |
Other comprehensive income (loss) |  | (24) | (13) | (28)
Ending balance |  | (123) | (99) | (86)
Dominion Gas Holdings, LLC | Deferred gains and losses on derivatives-hedging activities |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance |  | (17) | (20) |
Other comprehensive income before reclassifications: gains (losses) |  | (16) | 6 |
Amounts reclassified from accumulated other comprehensive income: (gains) losses | [3] | 9 | (3) |
Other comprehensive income (loss) |  | (7) | 3 |
Ending balance |  | (24) | (17) | (20)
Dominion Gas Holdings, LLC | Unrecognized pension and other postretirement benefit costs |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Roll Forward] |  |  |  |
Beginning balance |  | (82) | (66) |
Other comprehensive income before reclassifications: gains (losses) |  | (20) | (20) |
Amounts reclassified from accumulated other comprehensive income: (gains) losses | [3] | 3 | 4 |
Other comprehensive income (loss) |  | (17) | (16) |
Ending balance |  | $ (99) | $ (82) | $ (66)
[1] | See table below for details about these reclassifications.
[2] | See table below for details about these reclassifications.
[3] | See table below for details about these reclassifications.

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