Non-Derivative Fair Value Measurements (Nonrecurring Fair Value Measurements) (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended			12 Months Ended
	Dec. 31, 2024	Sep. 30, 2023	Dec. 31, 2024	Sep. 30, 2023	Mar. 31, 2022	Dec. 31, 2022	Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Long-lived assets, carrying amount	$ 138,852.0		$ 138,852.0			$ 111,059.0	$ 125,776.0
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	6,118.0		6,118.0			$ 6,582.0	6,156.0
NEER [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investment in equity method investees	$ 4,501.0		4,501.0				$ 3,963.0
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
NEER [Member] | XPLR [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value Measurement, Trading Price, Per Share	$ 17.80	$ 29.70
Investment in equity method investees	$ 2,600.0	$ 4,200.0	2,600.0	$ 4,200.0
Equity Method Investment, Other than Temporary Impairment, After Tax			600.0	900.0
Equity Method Investments, Fair Value Disclosure	$ 1,800.0	$ 3,000.0	1,800.0	3,000.0
Equity Method Investment, Other than Temporary Impairment			$ 800.0	$ 1,200.0