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Accumulated Other Comprehensive Income (Schedule of Changes in AOCI by Component Net of Tax) (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2017 | Mar. 31, 2016
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning balance | [1] | $ 14,605 |
Total other comprehensive income |  | 64 | $ 11
Ending balance |  | 14,917 |
Dominion Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning balance | [2] | 3,536 |
Total other comprehensive income |  | 2 | (8)
Ending balance |  | 3,640 |
Total |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning balance |  | (799) | (474)
Other comprehensive income before reclassifications: gains |  | 102 | 68
Amounts reclassified from AOCI: (gains) losses | [3] | (38) | (57)
Total other comprehensive income |  | 64 | 11
Ending balance |  | (735) | (463)
Total | Dominion Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning balance |  | (123) | (99)
Other comprehensive income before reclassifications: gains |  | (9) | (6)
Amounts reclassified from AOCI: (gains) losses | [3] | 11 | (2)
Total other comprehensive income |  | 2 | (8)
Ending balance |  | (121) | (107)
Deferred Gains and Losses on Derivatives-Hedging Activities |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning balance |  | (280) | (176)
Other comprehensive income before reclassifications: gains |  | 43 | 53
Amounts reclassified from AOCI: (gains) losses | [3] | (23) | (63)
Total other comprehensive income |  | 20 | (10)
Ending balance |  | (260) | (186)
Deferred Gains and Losses on Derivatives-Hedging Activities | Dominion Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning balance |  | (24) | (17)
Other comprehensive income before reclassifications: gains |  | (9) | (6)
Amounts reclassified from AOCI: (gains) losses | [3] | 11 | (2)
Total other comprehensive income |  | 2 | (8)
Ending balance |  | (22) | (25)
Unrealized Gains and Losses on Investment Securities |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning balance |  | 569 | 504
Other comprehensive income before reclassifications: gains |  | 58 | 15
Amounts reclassified from AOCI: (gains) losses | [3] | (28) | (2)
Total other comprehensive income |  | 30 | 13
Ending balance |  | 599 | 517
Unrecognized Pension and Other Postretirement Benefit Costs |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning balance |  | (1,082) | (797)
Other comprehensive income before reclassifications: gains |  | 0 | 0
Amounts reclassified from AOCI: (gains) losses | [3] | 13 | 8
Total other comprehensive income |  | 13 | 8
Ending balance |  | (1,069) | (789)
Unrecognized Pension and Other Postretirement Benefit Costs | Dominion Gas Holdings, LLC |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning balance |  | (99) | (82)
Other comprehensive income before reclassifications: gains |  | 0 | 0
Amounts reclassified from AOCI: (gains) losses | [3] | 0 | 0
Total other comprehensive income |  | 0 | 0
Ending balance |  | (99) | (82)
Other Comprehensive Income (Loss) From Equity Method Investee |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |
Beginning balance |  | (6) | (5)
Other comprehensive income before reclassifications: gains |  | 1 | 0
Amounts reclassified from AOCI: (gains) losses | [3] | 0 | 0
Total other comprehensive income |  | 1 | 0
Ending balance |  | $ (5) | $ (5)
[1] | Dominion’s Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Dominion Gas’ Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.
[3] | See table below for details about these reclassifications.

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