Investments and Restricted Cash and Cash Equivalents - EEGH (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Equity method investments:
Equity method investments		$ 6,453	$ 5,711
Restricted cash and cash equivalents:
Restricted cash and investments		1,065	1,013
Total investments and restricted cash and cash equivalents		8,852	10,763
Reflected as:
Current assets		217	1,253
Noncurrent assets		8,635	9,510
Equity income (loss)		(318)	(288)	$ (185)
EEGH
Investments:
Investment funds		18	19
Equity method investments:
Equity method investments		261	281
Restricted cash and cash equivalents:
Restricted cash and investments		27	31
Total investments and restricted cash and cash equivalents		288	312
Reflected as:
Current assets		27	31
Noncurrent assets		261	281
Investment exceeded share of equity in net assets		130	130
Distributions received from investments		92	73	195
Equity income (loss)		72	74	$ 103
EEGH | Customer deposits
Restricted cash and cash equivalents:
Restricted cash and investments		27	31
Iroquois Gas Transmission System, L.P.
Equity method investments:
Equity method investments		$ 580	599
Reflected as:
Equity method investment, ownership percentage		50.00%
Iroquois Gas Transmission System, L.P. | EEGH
Equity method investments:
Equity method investments		$ 243	$ 262
Reflected as:
Equity method investment, ownership percentage		50.00%
Equity income (loss)	$ 45