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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 | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance | [1] |  |  | $ 14,605 |
Total other comprehensive income (loss) |  |  |  | 117 | $ (19)
Ending balance |  | $ 14,973 |  | 14,973 |
Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance | [2] |  |  | 3,536 |
Total other comprehensive income (loss) |  | 1 | $ (8) | 3 | (16)
Ending balance |  | 3,711 |  | 3,711 |
Deferred Gains and Losses on Derivatives-Hedging Activities |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (260) | (186) | (280) | (176)
Other comprehensive income before reclassifications: gains (losses) |  | 28 | (11) | 71 | 42
Amounts reclassified from AOCI: (gains) losses | [3] | (18) | (44) | (41) | (107)
Total other comprehensive income (loss) |  | 10 | (55) | 30 | (65)
Ending balance |  | (250) | (241) | (250) | (241)
Deferred Gains and Losses on Derivatives-Hedging Activities | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (22) | (25) | (24) | (17)
Other comprehensive income before reclassifications: gains (losses) |  | 11 | (9) | 2 | (15)
Amounts reclassified from AOCI: (gains) losses | [3] | (12) | 0 | (1) | (2)
Total other comprehensive income (loss) |  | (1) | (9) | 1 | (17)
Ending balance |  | (23) | (34) | (23) | (34)
Unrealized Gains and Losses on Investment Securities |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | 599 | 517 | 569 | 504
Other comprehensive income before reclassifications: gains (losses) |  | 35 | 26 | 93 | 41
Amounts reclassified from AOCI: (gains) losses | [3] | (4) | (8) | (32) | (10)
Total other comprehensive income (loss) |  | 31 | 18 | 61 | 31
Ending balance |  | 630 | 535 | 630 | 535
Unrecognized Pension and Other Postretirement Benefit Costs |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (1,069) | (789) | (1,082) | (797)
Other comprehensive income before reclassifications: gains (losses) |  | 0 | 0 | 0 | 0
Amounts reclassified from AOCI: (gains) losses | [3] | 11 | 8 | 24 | 16
Total other comprehensive income (loss) |  | 11 | 8 | 24 | 16
Ending balance |  | (1,058) | (781) | (1,058) | (781)
Unrecognized Pension and Other Postretirement Benefit Costs | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (99) | (82) | (99) | (82)
Other comprehensive income before reclassifications: gains (losses) |  | 0 | 0 | 0 | 0
Amounts reclassified from AOCI: (gains) losses | [3] | 2 | 1 | 2 | 1
Total other comprehensive income (loss) |  | 2 | 1 | 2 | 1
Ending balance |  | (97) | (81) | (97) | (81)
Other Comprehensive Income (Loss) From Equity Method Investee |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (5) | (5) | (6) | (5)
Other comprehensive income before reclassifications: gains (losses) |  | 1 | (1) | 2 | (1)
Amounts reclassified from AOCI: (gains) losses | [3] | 0 | 0 | 0 | 0
Total other comprehensive income (loss) |  | 1 | (1) | 2 | (1)
Ending balance |  | (4) | (6) | (4) | (6)
Total |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (735) | (463) | (799) | (474)
Other comprehensive income before reclassifications: gains (losses) |  | 64 | 14 | 166 | 82
Amounts reclassified from AOCI: (gains) losses | [3] | (11) | (44) | (49) | (101)
Total other comprehensive income (loss) |  | 53 | (30) | 117 | (19)
Ending balance |  | (682) | (493) | (682) | (493)
Total | Dominion Energy Gas Holdings, LLC |  |  |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |  |  |
Beginning balance |  | (121) | (107) | (123) | (99)
Other comprehensive income before reclassifications: gains (losses) |  | 11 | (9) | 2 | (15)
Amounts reclassified from AOCI: (gains) losses | [3] | (10) | 1 | 1 | (1)
Total other comprehensive income (loss) |  | 1 | (8) | 3 | (16)
Ending balance |  | $ (120) | $ (115) | $ (120) | $ (115)
[1] | Dominion Energy’s Consolidated Balance Sheet at December 31, 2016 has been derived from the audited Consolidated Balance Sheet at that date.
[2] | Dominion Energy 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.

X
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