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Consolidated Statements of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Operating Activities      
Net income including noncontrolling interests $ 2,549 $ 3,120 $ 2,212
Net income 2,447 2,999 2,123
Adjustments to reconcile net income including noncontrolling interests to net cash provided by operating activities:      
Depreciation and amortization (including nuclear fuel) 2,280 2,202 1,849
Deferred income taxes and investment tax credits 517 (3) 725
Current income tax for Dominion Energy Questar Pipeline contribution to Dominion Energy Midstream     (212)
Proceeds from assignment of rental portfolio   91  
Contribution to pension plan   (75)  
Gains on sales of assets and equity method investments (1,006) (148) (50)
Provision for rate credits to electric utility customers 77    
Charges associated with equity method investments   158  
Charges associated with future ash pond and landfill closure costs 81   197
Impairment of assets and related charges 395 15 4
Net (gains) losses on nuclear decommissioning trusts funds and other investments 102 (117) (96)
Other adjustments 19 33 8
Changes in:      
Accounts receivable (110) (103) (286)
Inventories (29) 15 1
Deferred fuel and purchased gas costs, net (247) (71) 54
Prepayments (51) (62) 21
Accounts payable 67 (89) 97
Accrued interest, payroll and taxes (12) 64 203
Margin deposit assets and liabilities   (10) (66)
Net realized and unrealized changes related to derivative activities 181 44 (335)
Asset retirement obligations (35) (94) (61)
Pension and other postretirement benefits (114) (177) (152)
Other operating assets and liabilities 109 (291) 38
Net cash provided by operating activities 4,773 4,502 4,151
Investing Activities      
Plant construction and other property additions (including nuclear fuel) (4,254) (5,504) (6,085)
Acquisition of Dominion Energy Questar, net of cash acquired     (4,381)
Acquisition of solar development projects (151) (405) (40)
Proceeds from sales of securities 1,804 1,831 1,422
Purchases of securities (1,894) (1,940) (1,504)
Proceeds from the sale of certain retail energy marketing assets 54 68  
Proceeds from sales of certain merchant generation facilities and equity method investments 2,379    
Proceeds from assignment of shale development rights 109 70 10
Contributions to equity method affiliates (428) (370) (198)
Distributions from equity method affiliates 36 275 2
Other (13) 33 83
Net cash used in investing activities (2,358) (5,942) (10,691)
Financing Activities      
Issuance (repayment) of short-term debt, net (2,964) 143 (654)
Issuance of short-term notes 1,450   1,200
Repayment and repurchase of short-term notes (1,450) (250) (1,800)
Issuance and remarketing of long-term debt 6,362 3,880 7,722
Repayment and repurchase of long-term debt (5,682) (1,572) (1,610)
Credit facility borrowings 73    
Net proceeds from issuance of Dominion Energy Midstream common units 4 18 482
Net proceeds from issuance of Dominion Energy Midstream preferred units     490
Proceeds from sale of interest in merchant solar projects     117
Contributions from NRG and SunEdison to Four Brothers and Three Cedars   9 189
Issuance of common stock 2,461 1,302 2,152
Common dividend payments (2,185) (1,931) (1,727)
Other (278) (296) (331)
Net cash provided by (used in) financing activities (2,209) 1,303 6,230
Increase (decrease) in cash, restricted cash and equivalents 206 (137) (310)
Cash, restricted cash and equivalents at beginning of year 185 322 632
Cash, restricted cash and equivalents at end of year 391 185 322
Supplemental Cash Flow Information      
Interest and related charges, excluding capitalized amounts 1,362 1,083 905
Income taxes 89 9 145
Significant noncash investing and financing activities:      
Accrued capital expenditures [1],[2] 307 343 427
Receivables from sales of assets and equity method investments [1],[2] 159    
Guarantee provided by equity method affiliate [1],[2]   30  
Virginia Electric and Power Company      
Operating Activities      
Net income 1,282 1,540 1,218
Adjustments to reconcile net income including noncontrolling interests to net cash provided by operating activities:      
Depreciation and amortization (including nuclear fuel) 1,309 1,333 1,210
Deferred income taxes and investment tax credits 224 269 469
Proceeds from assignment of rental portfolio   91  
Charges associated with future ash pond and landfill closure costs 81   197
Provision for rate credits to customers 77    
Other adjustments (21) (36) (16)
Changes in:      
Accounts receivable (60) (27) (65)
Affiliated receivables and payables (14) 125 220
Inventories 13 3 20
Deferred fuel and purchased gas costs, net (269) (59) 69
Prepayments (1) 3 8
Accounts payable (26) (42) 25
Accrued interest, payroll and taxes (8) 17 49
Net realized and unrealized changes related to derivative activities 119 13 (153)
Asset retirement obligations (54) (88) (59)
Other operating assets and liabilities 188 (181) 77
Net cash provided by operating activities 2,840 2,961 3,269
Investing Activities      
Plant construction and other property additions (including nuclear fuel) (2,228) (2,496) (2,489)
Purchases of nuclear fuel (173) (192) (153)
Acquisition of solar development projects (141) (41) (7)
Proceeds from sales of securities 887 849 733
Purchases of securities (925) (884) (775)
Other (63) (41) (33)
Net cash used in investing activities (2,643) (2,805) (2,724)
Financing Activities      
Issuance (repayment) of short-term debt, net (228) 477 (1,591)
Issuance (repayment) of affiliated current borrowings, net 191 (229) (114)
Issuance and remarketing of long-term debt 1,300 1,500 1,688
Repayment and repurchase of long-term debt (964) (681) (517)
Common dividend payments (464) (1,199)  
Other (18) (11) (18)
Net cash provided by (used in) financing activities (183) (143) (552)
Increase (decrease) in cash, restricted cash and equivalents 14 13 (7)
Cash, restricted cash and equivalents at beginning of year 24 11 18
Cash, restricted cash and equivalents at end of year 38 24 11
Supplemental Cash Flow Information      
Interest and related charges, excluding capitalized amounts 498 458 435
Income taxes 128 362 79
Significant noncash investing and financing activities:      
Accrued capital expenditures 204 169 256
Dominion Energy Gas Holdings, LLC      
Operating Activities      
Net income 301 615 392
Adjustments to reconcile net income including noncontrolling interests to net cash provided by operating activities:      
Depreciation and amortization (including nuclear fuel) 244 227 204
Deferred income taxes and investment tax credits 33 27 238
Gains on sales of assets and equity method investments (109) (70) (50)
Impairment of assets and related charges 348 15  
Other adjustments (7) (7) (6)
Changes in:      
Accounts receivable (14) (17) (68)
Affiliated receivables and payables 3 40 88
Inventories (1) 6 8
Prepayments (4) (18) (6)
Accounts payable (5) (17) 15
Accrued interest, payroll and taxes 15 24 42
Pension and other postretirement benefits (155) (143) (141)
Other operating assets and liabilities (17) (16) (68)
Net cash provided by operating activities 632 666 648
Investing Activities      
Plant construction and other property additions (including nuclear fuel) (772) (778) (854)
Proceeds from sale of equity method investment in Iroquois     7
Proceeds from assignment of shale development rights 109 70 10
Other (16) (19) (12)
Net cash used in investing activities (679) (727) (849)
Financing Activities      
Issuance (repayment) of short-term debt, net (619) 169 69
Issuance (repayment) of affiliated current borrowings, net 200 (100) 23
Issuance and remarketing of long-term debt 500   680
Repayment and repurchase of long-term debt     (400)
Distribution payments to parent (25) (15) (150)
Other (5) (6) (5)
Net cash provided by (used in) financing activities 51 48 217
Increase (decrease) in cash, restricted cash and equivalents 4 (13) 16
Cash, restricted cash and equivalents at beginning of year 30 43 27
Cash, restricted cash and equivalents at end of year 34 30 43
Supplemental Cash Flow Information      
Interest and related charges, excluding capitalized amounts 95 89 81
Income taxes 79 9 (92)
Significant noncash investing and financing activities:      
Accrued capital expenditures $ 38 $ 38 $ 59
[1] See Note 19 for noncash activities related to the remeasurement of Dominion Energy's noncontrolling interest in Dominion Energy Midstream.
[2] See Note 9 for noncash activities related to equity method investments.