Consolidated Statement of Cash Flows - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
OPERATING ACTIVITIES
Net Income	$ 1,600	$ 1,193	$ 1,144
PRINCIPAL NON-CASH CHARGES/(CREDITS) TO INCOME
Depreciation and amortization	2,056	2,032	1,920
Impairment of assets	0	443	320
Deferred income taxes	435	133	85
Net derivative (gains)/losses	(181)	(53)	57
Other non-cash items, net	163	111	(8)
CHANGES IN ASSETS AND LIABILITIES
Accounts receivable - customers	(285)	(411)	(543)
Unbilled revenue and net unbilled revenue deferrals	(96)	(53)	(1)
Reserve adjustments	5	169	78
Materials and supplies, including fuel oil and gas in storage	(111)	(82)	(4)
Prepayments, other receivables and other current assets	31	(234)	(179)
Accounts payable	558	44	170
Pensions and retiree benefits obligations, net	176	266	285
Pensions and retiree benefits contributions	(39)	(472)	(478)
Accrued taxes	7	(46)	74
Distributions from equity investments	20	18	39
System benefit charge	(41)	(34)	(119)
Deferred charges, noncurrent assets, leases, net and other regulatory assets	(870)	(496)	(686)
Deferred credits, noncurrent liabilities and other regulatory liabilities	423	248	(58)
Other current liabilities	84	(43)	102
NET CASH FLOWS FROM OPERATING ACTIVITIES	3,935	2,733	2,198
INVESTING ACTIVITIES
Utility construction expenditures	(3,824)	(3,630)	(3,326)
Cost of removal less salvage	(337)	(323)	(310)
Non-utility construction expenditures	(344)	(323)	(583)
Proceeds from sale of assets	0	629	0
Divestiture of renewable electric projects	0	183	0
Other investing activities	4	10	22
NET CASH FLOWS USED IN INVESTING ACTIVITIES	(4,565)	(3,484)	(4,224)
FINANCING ACTIVITIES
Net (payment)/issuance of short-term debt	1,702	(382)	178
Issuance of long-term debt	800	2,804	2,925
Retirement of long-term debt	(406)	(1,960)	(518)
Debt issuance costs	(13)	(40)	(47)
Common stock dividends	(1,089)	(1,030)	(975)
Issuance of common shares - public offering	0	775	640
Issuance of common shares for stock plans	57	60	58
Distribution to noncontrolling interest	(37)	(23)	(16)
Sale of equity interest	0	257	0
NET CASH FLOWS FROM FINANCING ACTIVITIES	1,014	461	2,245
CASH, TEMPORARY CASH INVESTMENTS AND RESTRICTED CASH:
NET CHANGE FOR THE PERIOD	384	(290)	219
BALANCE AT BEGINNING OF PERIOD	1,146	1,436	1,217
BALANCE AT END OF PERIOD	1,530	1,146	1,436
Total cash, temporary cash investments and restricted cash	1,530	1,146	1,436
LESS: CHANGE IN CASH BALANCES HELD FOR SALE	248	0	0
BALANCE AT END OF PERIOD EXCLUDING HELD FOR SALE	1,282	1,146	1,436
Cash paid/(received) during the period for:
Interest	900	924	920
Income taxes	47	9	38
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Construction expenditures in accounts payable	681	457	478
Issuance of common shares for dividend reinvestment	31	49	48
Electric and Gas Transmission Projects
INVESTING ACTIVITIES
Investments in/acquisitions of projects	(64)	(30)	(3)
Renewable Electric Production Projects
INVESTING ACTIVITIES
Investments in/acquisitions of projects	0	0	(24)
Software Licenses
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	2	23	51
Equipment
SUPPLEMENTAL DISCLOSURE OF NON-CASH INFORMATION
Capital expenditures incurred but unpaid as of end of period	$ 17	$ 22	$ 28