Schedule I - Condensed Financial Information - Income and Comprehensive Income (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Condensed Income Statements,Captions [Line Items]
Taxes, other than income taxes	$ (3,043)	$ (3,005)	$ (2,810)
Interest expense	(1,023)	(852)	(905)
Income tax benefit (expense)	(487)	(498)	(190)
Gain on the sale of the Clean Energy Businesses	865	0	0
NET INCOME FOR COMMON STOCK	2,519	1,660	1,346
Comprehensive Income	$ 2,519	$ 1,677	$ 1,376
Net Income Per Share – Basic (in dollars per share)	$ 7.25	$ 4.68	$ 3.86
Net Income Per Share – Diluted (in dollars per share)	$ 7.21	$ 4.66	$ 3.85
Average Number Of Shares Outstanding—Basic (in shares)	347.7	354.5	348.4
Average Number Of Shares Outstanding—Diluted (in shares)	349.3	355.8	349.4
Parent Company
Condensed Income Statements,Captions [Line Items]
Equity in earnings of subsidiaries	$ 1,759	$ 1,860	$ 1,369
Other operating and maintenance expenses	0	(1)	(1)
Taxes, other than income taxes	(2)	(7)	(6)
Other income (deductions)	7	(31)	14
Interest expense	(14)	(32)	(37)
Income tax benefit (expense)	(96)	(129)	7
Gain on the sale of the Clean Energy Businesses	865	0	0
NET INCOME FOR COMMON STOCK	2,519	1,660	1,346
Comprehensive Income	$ 2,520	$ 1,677	$ 1,376
Net Income Per Share – Basic (in dollars per share)	$ 7.25	$ 4.68	$ 3.86
Net Income Per Share – Diluted (in dollars per share)	7.21	4.66	3.85
Dividends Declared Per Share (in dollars per share)	$ 3.24	$ 3.16	$ 3.10
Average Number Of Shares Outstanding—Basic (in shares)	347.7	354.5	348.4
Average Number Of Shares Outstanding—Diluted (in shares)	349.3	355.8	349.4