Components of Accumulated Other Comprehensive Loss, Net - EEGH (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2024	Mar. 31, 2023
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 49,740	$ 50,639
Other comprehensive (loss) income	(127)	40
Ending balance	50,259	51,651
EEGH
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	7,528	7,888
Other comprehensive (loss) income	1	(3)
Ending balance	7,550	8,005
Accumulated Other Comprehensive (Loss) Income, Net
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,904)	(2,149)
Other comprehensive (loss) income	(127)	40
Ending balance	(2,031)	(2,109)
Accumulated Other Comprehensive (Loss) Income, Net | EEGH
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(40)	(42)
Other comprehensive (loss) income	1	(3)
Ending balance	(39)	(45)
Unrecognized Amounts on Retirement Benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(426)	(390)
Other comprehensive (loss) income	11	(4)
Ending balance	(415)	(394)
Unrecognized Amounts on Retirement Benefits | EEGH
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(3)	(1)
Other comprehensive (loss) income	1	(1)
Ending balance	(2)	(2)
Unrealized Losses on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	71	135
Other comprehensive (loss) income	7	(55)
Ending balance	78	80
Unrealized Losses on Cash Flow Hedges | EEGH
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(38)	(43)
Other comprehensive (loss) income	0	(2)
Ending balance	(38)	(45)
Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	1	2
Other comprehensive (loss) income	0	0
Ending balance	1	2
Noncontrolling Interest | EEGH
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1)	(2)
Other comprehensive (loss) income	0	0
Ending balance	$ (1)	$ (2)