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
Beginning 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 interests			(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 interests			(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
Net income including noncontrolling interests	1,376	842	232	489			1,358	721	18	121
Acquisition of public interest in Dominion Energy Midstream	(40)	(40)	1,181				1,181	1,181	(1,221)	(1,221)
Dividends and distributions		(636)	(457)					(457)		(179)
Equity contributions from Dominion Energy		3,385	3,385					3,385
Dominion Energy Gas Restructuring		(2,168)	$ (6,145)	3,978		(1)		(2,168)
Other comprehensive income (loss), net of tax		(18)				(17)		(17)		(1)
Other	14	(1)		(2)			14	(2)		1
Ending balance at Dec. 31, 2019	$ 34,033	$ 10,229		$ 9,031	$ (1,793)	$ (187)	$ 31,994	$ 8,844	$ 2,039	$ 1,385