Schedule I - Condensed Financial Information - Income and Comprehensive Income (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Condensed Income Statements,Captions [Line Items]
Taxes, other than income taxes	$ (3,005)	$ (2,810)	$ (2,575)
Interest expense	(852)	(905)	(1,019)
Income tax expense (benefit)	(498)	(190)	(90)
NET INCOME	1,660	1,346	1,101
Comprehensive Income	$ 1,677	$ 1,376	$ 1,095
Net Income Per Share – Basic (in dollars per share)	$ 4.68	$ 3.86	$ 3.29
Net Income Per Share – Diluted (in dollars per share)	$ 4.66	$ 3.85	$ 3.28
Average Number Of Shares Outstanding—Basic (in shares)	354.5	348.4	334.8
Average Number Of Shares Outstanding—Diluted (in shares)	355.8	349.4	335.7
Parent Company
Condensed Income Statements,Captions [Line Items]
Equity in earnings of subsidiaries	$ 1,860	$ 1,369	$ 1,105
Other operating and maintenance expenses	(1)	(1)	(1)
Taxes, other than income taxes	(7)	(6)	(12)
Other income (deductions)	(31)	14	33
Interest expense	(32)	(37)	(60)
Income tax expense (benefit)	(129)	7	36
NET INCOME	1,660	1,346	1,101
Comprehensive Income	$ 1,677	$ 1,376	$ 1,095
Net Income Per Share – Basic (in dollars per share)	$ 4.68	$ 3.86	$ 3.29
Net Income Per Share – Diluted (in dollars per share)	4.66	3.85	3.28
Dividends Declared Per Share (in dollars per share)	$ 3.16	$ 3.10	$ 3.06
Average Number Of Shares Outstanding—Basic (in shares)	354.5	348.4	334.8
Average Number Of Shares Outstanding—Diluted (in shares)	355.8	349.4	335.7