Components of Accumulated Other Comprehensive Loss, Net - EEGH (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 50,639	$ 50,589	$ 46,977
Other comprehensive income (loss)	246	(806)	217
Purchase of Cove Point noncontrolling interest	(3,180)
Ending balance	49,740	50,639	50,589
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(2,149)	(1,340)	(1,552)
Other comprehensive income (loss)	246	(809)	212
Purchase of Cove Point noncontrolling interest	(1)
Ending balance	(1,904)	(2,149)	(1,340)
Unrecognized Amounts on Retirement Benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(390)	(318)	(492)
Other comprehensive income (loss)	(36)	(72)	174
Purchase of Cove Point noncontrolling interest	0
Ending balance	(426)	(390)	(318)
Unrealized Gains (Losses) on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	135	59	(8)
Other comprehensive income (loss)	(64)	76	67
Purchase of Cove Point noncontrolling interest	0
Ending balance	71	135	59
Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(2)	(5)	(10)
Other comprehensive income (loss)	0	3	5
Purchase of Cove Point noncontrolling interest	(1)
Ending balance	(1)	(2)	(5)
EEGH
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	7,888	7,494	6,995
Other comprehensive income (loss)	3	4	15
Purchase of Cove Point noncontrolling interest	(3,180)
Ending balance	7,528	7,888	7,494
EEGH | Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(42)	(43)	(53)
Other comprehensive income (loss)	3	1	10
Purchase of Cove Point noncontrolling interest	(1)
Ending balance	(40)	(42)	(43)
EEGH | Unrecognized Amounts on Retirement Benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1)	(6)	(12)
Other comprehensive income (loss)	(2)	5	6
Purchase of Cove Point noncontrolling interest	0
Ending balance	(3)	(1)	(6)
EEGH | Unrealized Gains (Losses) on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(43)	(42)	(51)
Other comprehensive income (loss)	5	(1)	9
Purchase of Cove Point noncontrolling interest	0
Ending balance	(38)	(43)	(42)
EEGH | Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(2)	(5)	(10)
Other comprehensive income (loss)	0	3	5
Purchase of Cove Point noncontrolling interest	(1)
Ending balance	$ (1)	$ (2)	$ (5)