Investments and Restricted Cash and Cash Equivalents - EEGH (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2022	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Equity method investments:
Total equity method investments		$ 5,711	$ 6,062
Restricted cash and cash equivalents:
Restricted cash and investments		1,013	890
Total investments and restricted cash and cash equivalents and investments		10,763	13,414
Reflected as:
Other current assets		1,253	2,141
Noncurrent assets		9,510	11,273
Equity income (loss)		(288)	(185)	$ (237)
EEGH
Investments:
Investment funds		19	14
Equity method investments:
Total equity method investments		281	278
Restricted cash and cash equivalents:
Restricted cash and investments		31	30
Total investments and restricted cash and cash equivalents and investments		312	308
Reflected as:
Other current assets		31	30
Noncurrent assets		281	278
Investment exceeded share of equity in net assets		130	130
Equity method investments contributions				154
Distributions received from investments		73	195	44
Equity income (loss)		74	103	$ 44
EEGH | Customer deposits
Restricted cash and cash equivalents:
Restricted cash and investments		31	30
Iroquois Gas Transmission System, L.P.
Equity method investments:
Total equity method investments		$ 599	600
Reflected as:
Equity method investment, ownership percentage		50.00%
Iroquois Gas Transmission System, L.P. | EEGH
Equity method investments:
Total equity method investments		$ 262	$ 264
Reflected as:
Equity method investment, ownership percentage		50.00%
Equity income (loss)	$ 45