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Dominion Energy Gas Holdings, LLC Consolidated Statements of Equity - USD ($) $ in Millions | Total | Dominion Energy Gas Holdings, LLC | Predecessor Equity Dominion Energy Gas Holdings, LLC | Membership Interests Dominion Energy Gas Holdings, LLC | Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) Dominion Energy Gas Holdings, LLC | Total Members' Equity | Total Members' Equity Dominion Energy Gas Holdings, LLC | Noncontrolling Interests | Noncontrolling Interests Dominion Energy Gas Holdings, LLC | Common Units | Common Units Dominion Energy Gas Holdings, LLC | Common Units Noncontrolling Interests | Common Units Noncontrolling Interests Dominion Energy Gas Holdings, LLC | Convertible Preferred Units Dominion Energy Gas Holdings, LLC | Convertible Preferred Units Noncontrolling Interests Dominion Energy Gas Holdings, LLC
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Beginning balance at Dec. 31, 2015 | $ 13,602 | $ 6,175 | $ 1,436 | $ 3,417 | $ (474) | $ (99) | $ 12,664 | $ 4,754 | $ 938 | $ 1,421 |  |  |  |  |  |
Net income including noncontrolling interests | 2,212 | 578 | 85 | 392 |  |  | 2,123 | 477 | 89 | 101 |  |  |  |  |  |
Record Dominion Energy's net investment in Dominion Energy Questar Pipeline |  | 1,283 | 1,283 |  |  |  |  | 1,283 |  |  |  |  |  |  |  |
Net income attributable to Dominion Energy Questar Pipeline prior to the Dominion Energy Questar Pipeline Acquisition |  | 6 | 6 |  |  |  |  | 6 |  |  |  |  |  |  |  |
Contribution from Dominion Energy to Dominion Energy Questar Pipeline prior to Dominion Energy Questar Pipeline Acquisition |  | 1 | 1 |  |  |  |  | 1 |  |  |  |  |  |  |  |
Contribution to DEQPS |  | (37) | (37) |  |  |  |  | (37) |  |  |  |  |  |  |  |
Consideration provided to Dominion Energy for Questar Pipeline Acquisition |  | (823) | (823) |  |  |  |  | (823) |  |  |  |  |  |  |  |
Sale of Dominion Energy Midstream common units - net of offering costs |  |  |  |  |  |  |  |  |  |  | $ 482 | $ 482 | $ 482 | $ 482 | $ 490 | $ 490
Purchase of Dominion Energy Midstream common units | (17) | (17) | 3 |  |  |  | (3) | 3 | (14) | (14) |  |  |  |  |  |
Dividends and distributions | (1,789) | (633) | (441) | (150) |  |  | (1,727) | (591) | (62) | (42) |  |  |  |  |  |
Distributions to noncontrolling interest |  |  | (264) |  |  |  |  | (264) |  | 264 |  |  |  |  |  |
Equity contributions from Dominion Energy | 139 | 208 | 197 |  |  |  | 22 | 197 | 117 | 11 |  |  |  |  |  |
Other comprehensive income (loss), net of tax |  | (24) |  |  |  | (24) |  | (24) |  |  |  |  |  |  |  |
Other | 2 | (2) | (2) |  |  |  | 8 | (2) | (6) |  |  |  |  |  |  |
Ending balance at Dec. 31, 2016 | 16,840 | 7,687 | 1,438 | 3,659 | (799) | (123) | 14,605 | 4,974 | 2,235 | 2,713 |  |  |  |  |  |
Net income including noncontrolling interests | 3,120 | 829 | 88 | 615 |  |  | 2,999 | 703 | 121 | 126 |  |  |  |  |  |
Sale of Dominion Energy Midstream common units - net of offering costs |  |  |  |  |  |  |  |  |  |  | $ 18 | 18 | $ 18 | 18 |  |
Dividends and distributions | (2,087) | (121) | (19) | (15) |  |  | (1,931) | (34) | (156) | (87) |  |  |  |  |  |
Distributions to noncontrolling interest |  |  | (193) |  |  |  |  | (193) |  | 193 |  |  |  |  |  |
Equity contributions from Dominion Energy |  | 51 | 44 |  |  |  |  | 44 |  | 7 |  |  |  |  |  |
Other comprehensive income (loss), net of tax |  | 26 |  |  |  | 25 |  | 25 |  | 1 |  |  |  |  |  |
Other | (5) | 5 | 3 | 2 |  |  | (5) | 5 |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2017 | 19,370 | 8,495 | 1,361 | 4,261 | (659) | (98) | 17,142 | 5,524 | 2,228 | 2,971 |  |  |  |  |  |
Cumulative-effect of changes in accounting principles | 6 | 3 |  | 29 | (1,023) | (26) | (121) | 3 | 127 |  |  |  |  |  |  |
Net income including noncontrolling interests | 2,549 | 656 | 180 | 301 |  |  | 2,447 | 481 | 102 | 175 |  |  |  |  |  |
Sale of Dominion Energy Midstream common units - net of offering costs | 4 |  |  |  |  |  |  |  | 4 |  |  | $ 4 |  | $ 4 |  |
Remeasurement of noncontrolling interest in Dominion Energy Midstream |  |  | 375 |  |  |  | 375 | 375 | (375) | (375) |  |  |  |  |  |
Dividends and distributions | (2,331) | (296) | (133) | (25) |  |  | (2,185) | (158) | (146) | (138) |  |  |  |  |  |
Distributions to noncontrolling interest |  |  | (27) |  |  |  |  | (27) |  | 27 |  |  |  |  |  |
Equity contributions from Dominion Energy |  | 48 | 48 |  |  |  |  | 48 |  |  |  |  |  |  |  |
Other comprehensive income (loss), net of tax |  | (45) |  |  |  | (45) |  | (45) |  |  |  |  |  |  |  |
Other | 16 |  |  |  |  |  | 16 |  |  |  |  |  |  |  |  |
Ending balance at Dec. 31, 2018 | $ 22,048 | $ 8,865 | $ 1,804 | $ 4,566 | $ (1,700) | $ (169) | $ 20,107 | $ 6,201 | $ 1,941 | $ 2,664 |  |  |  |  |  |

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