Consolidated Statements of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Activities
Net income including noncontrolling interests	$ (550)	$ 1,376	$ 2,549
Net income	(401)	1,358	2,447
Adjustments to reconcile net income (loss) including noncontrolling interests to net cash provided by operating activities:
Depreciation, depletion and amortization (including nuclear fuel)	2,836	2,977	2,280
Deferred income taxes and investment tax credits	(324)	216	517
Gains on sales of assets and equity method investments	(63)	(167)	(1,006)
Contribution to pension plan	(250)	(21)
Provision for refunds and rate credits to electric utility customers		800	77
Impairment of assets and other charges	2,345	1,333	395
Loss for equity method investee	2,405
Charges related to a voluntary retirement program		320
Net (gains) losses on nuclear decommissioning trusts funds and other investments	(412)	(626)	102
Charge (revision) for future ash pond and landfill closure costs	11	(113)	81
Other adjustments	159	(5)	19
Changes in:
Accounts receivable	(238)	(71)	(110)
Inventories	39	(90)	(29)
Deferred fuel and purchased gas costs, net	212	195	(247)
Prepayments	7	(225)	(51)
Accounts payable	35	(225)	67
Accrued interest, payroll and taxes	(53)	(78)	(12)
Customer deposits	(13)	(101)	54
Margin deposit assets and liabilities	26	60
Net realized and unrealized changes related to derivative activities	(36)	43	181
Pension and other postretirement benefits	(319)	(148)	(114)
Other operating assets and liabilities	(456)	(246)	20
Net cash provided by operating activities	5,227	5,204	4,773
Investing Activities
Plant construction and other property additions (including nuclear fuel)	(6,020)	(4,980)	(4,254)
Cash and restricted cash acquired in the SCANA Combination		389
Acquisition of solar development projects	(311)	(341)	(151)
Proceeds from sales of assets and equity method investments	143	447	2,542
Proceeds from sales of securities	4,278	1,712	1,804
Purchases of securities	(4,379)	(1,749)	(1,894)
Contributions to equity method affiliates	(148)	(209)	(428)
Acquisition of equity method investments	(178)
Other	12	109	23
Net cash used in investing activities	(2,916)	(4,622)	(2,358)
Financing Activities
Issuance (repayment) of short-term debt, net	(16)	404	(2,964)
Issuance of short-term notes	1,125	3,000	1,450
Repayment and repurchase of short-term notes	(1,125)	(3,000)	(1,450)
Supplemental 364-day credit facility borrowings	225
Credit facility borrowings (repayments)		(113)	73
Issuance and remarketing of long-term debt	6,577	4,374	6,362
Repayment and repurchase of long-term debt (including redemption premiums)	(2,879)	(9,116)	(5,682)
Proceeds from sale of interest in Cove Point		2,078
Issuance of 2019 Equity Units		1,582
Issuance of Series B Preferred Stock		791
Repurchase of common stock	(3,080)
Issuance of common stock	159	2,515	2,461
Common dividend payments	(2,873)	(2,983)	(2,185)
Other	(446)	(236)	(274)
Net cash used in financing activities	(2,333)	(704)	(2,209)
Increase (decrease) in cash, restricted cash and equivalents	(22)	(122)	206
Cash, restricted cash and equivalents at beginning of period	269	391	185
Cash, restricted cash and equivalents at end of period	247	269	391
Virginia Electric and Power Company
Operating Activities
Net income	1,021	1,149	1,282
Adjustments to reconcile net income (loss) including noncontrolling interests to net cash provided by operating activities:
Depreciation, depletion and amortization (including nuclear fuel)	1,421	1,392	1,309
Deferred income taxes and investment tax credits	(206)	(80)	224
Impairment of assets and other charges	1,079	624
Provision for rate credits to customers			77
Charges related to a voluntary retirement program		116
Charge (revision) for future ash pond and landfill closure costs	11	(113)	81
Other adjustments	(61)	(86)	(21)
Changes in:
Accounts receivable	(266)	(196)	(60)
Affiliated receivables and payables	78	75	(14)
Inventories	10	(56)	13
Deferred fuel and purchased gas costs, net	131	243	(269)
Prepayments	(5)	1	(1)
Accounts payable	6	(31)	(26)
Accrued interest, payroll and taxes	(4)	5	(8)
Net realized and unrealized changes related to derivative activities	(6)	21	119
Other operating assets and liabilities	(309)	(280)	134
Net cash provided by operating activities	2,900	2,784	2,840
Investing Activities
Plant construction and other property additions	(3,138)	(2,642)	(2,228)
Purchases of nuclear fuel	(199)	(157)	(173)
Acquisition of solar development projects	(35)	(182)	(141)
Proceeds from sales of securities	884	858	887
Purchases of securities	(936)	(905)	(925)
Other	21	(37)	(63)
Net cash used in investing activities	(3,403)	(3,065)	(2,643)
Financing Activities
Repayment of short-term debt, net	(198)	(71)	(228)
Issuance (repayment) of affiliated current borrowings, net	273	(117)	191
Issuance and remarketing of long-term debt	1,327	1,248	1,300
Repayment and repurchase of long-term debt (including redemption premiums)	(427)	(591)	(964)
Common dividend payments	(430)	(190)	(464)
Other	(31)	(12)	(18)
Net cash used in financing activities	514	267	(183)
Increase (decrease) in cash, restricted cash and equivalents	11	(14)	14
Cash, restricted cash and equivalents at beginning of period	24	38	24
Cash, restricted cash and equivalents at end of period	35	$ 24	$ 38
GT&S Transaction
Adjustments to reconcile net income (loss) including noncontrolling interests to net cash provided by operating activities:
Gains on sales of assets and equity method investments	(134)
GT&S Transaction and Q-Pipe Transaction
Investing Activities
Proceeds from sales of assets and equity method investments	$ 3,687