Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
OPERATING ACTIVITIES
Net Income	$ 1,193	$ 1,144	$ 1,440
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	2,032	1,920	1,684
Impairment of assets	443	320	0
Deferred income taxes	133	85	308
Rate case amortization and accruals	(16)	(40)	(116)
Common equity component of allowance for funds used during construction	(21)	(17)	(14)
Net derivative (gains)/losses	(53)	57	27
Gain on Sale of Assets	0	0	(14)
Unbilled revenue and net unbilled revenue deferrals	(53)	(1)	(3)
Other non-cash items, net	148	49	(26)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable - customers	(411)	(543)	23
Reserve adjustments	169	78	8
Materials and supplies, including fuel oil and gas in storage	(82)	(4)	6
Revenue decoupling mechanism receivable	(53)	(61)	(76)
Other receivables and other current assets	(103)	(134)	54
Taxes receivable	13	(6)	29
Prepayments	(24)	(11)	(73)
Accounts payable	44	170	10
Pensions and retiree benefits obligations, net	266	285	357
Pensions and retiree benefits contributions	(472)	(478)	(357)
Accrued taxes	(46)	74	10
Accrued interest	4	(4)	24
Superfund and environmental remediation costs	(10)	(22)	(9)
Distributions from equity investments	18	39	57
System benefit charge	(34)	(119)	20
Deferred charges, noncurrent assets and other regulatory assets	(563)	(653)	(492)
Deferred credits and other regulatory liabilities	175	10	278
Other current and noncurrent liabilities	36	60	(21)
NET CASH FLOWS FROM OPERATING ACTIVITIES	2,733	2,198	3,134
INVESTING ACTIVITIES
Utility construction expenditures	(3,630)	(3,326)	(3,238)
Cost of removal less salvage	(323)	(310)	(295)
Non-utility construction expenditures	(323)	(583)	(248)
Proceeds from sale of assets	629	0	192
Other investing activities	10	22	22
Net (payment)/issuance of short-term debt	(382)	178	(874)
Divestiture of renewable electric projects	183	0	0
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(3,484)	(4,224)	(3,782)
FINANCING ACTIVITIES
Issuance of long-term debt	2,804	2,925	3,017
Retirement of long-term debt	(1,960)	(518)	(1,195)
Debt issuance costs	(40)	(47)	(32)
Common stock dividends	(1,030)	(975)	(924)
Issuance of common shares - public offering	775	640	825
Issuance of common shares for stock plans	60	58	54
Distribution to noncontrolling interest	(23)	(16)	(12)
Proceeds from Other Equity	257	0	0
NET CASH FLOWS FROM FINANCING ACTIVITIES	461	2,245	859
CASH, TEMPORARY CASH INVESTMENTS AND RESTRICTED CASH:
NET CHANGE FOR THE PERIOD	(290)	219	211
BALANCE AT BEGINNING OF PERIOD	1,436	1,217	1,006
BALANCE AT END OF PERIOD	1,146	1,436	1,217
Cash paid/(received) during the period for:
Interest	924	920	876
Income taxes	9	38	(26)
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Construction expenditures in accounts payable	457	478	336
Issuance of common shares for dividend reinvestment	49	48	47
Electric and Gas Transmission Projects
INVESTING ACTIVITIES
Investments in/acquisitions of projects	(30)	(3)	(205)
Renewable Electric Production Projects
INVESTING ACTIVITIES
Investments in/acquisitions of projects	0	(24)	(10)
Software Licenses
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	23	51	80
Equipment
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	$ 22	$ 28	$ 33