Non-Derivative Fair Value Measurements (Nonrecurring Fair Value Measurements) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Sep. 30, 2023	Mar. 31, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets, carrying amount			$ 125,776.0	$ 111,059.0	$ 99,348.0
Impairment, Long-Lived Asset, Held-for-Use, Statement of Income or Comprehensive Income [Extensible Enumeration]		Income (Loss) from Equity Method Investments
Investment in equity method investees			6,156.0	6,582.0	$ 6,159.0
Equity Method Investment, Other than Temporary Impairment, After Tax	$ 900.0
Equity Method Investment, Other than Temporary Impairment	$ 1,200.0
NEER [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement, Trading Price, Per Share	$ 29.70
Investment in equity method investees	$ 4,200.0		$ 3,963.0	$ 4,968.0
Equity Method Investments, Fair Value Disclosure	$ 3,000.0
NEER [Member] | Mountain Valley Pipeline [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Impairment of long-lived assets		$ 800.0
Impairment of long-lived assets, after tax		600.0
Equity method investment write-off, carrying amount		600.0
Equity method investment, liability		$ 200.0