Components of Accumulated Other Comprehensive Loss, Net - EEGH (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	$ 50,639	$ 50,589
Other comprehensive income (loss)	40	(18)
Balance	51,651	50,424
EEGH
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	7,888	7,494
Other comprehensive income (loss)	(3)	5
Balance	8,005	7,590
Accumulated Other Comprehensive (Loss) Income, Net
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	(2,149)	(1,340)
Other comprehensive income (loss)	40	(18)
Balance	(2,109)	(1,358)
Accumulated Other Comprehensive (Loss) Income, Net | EEGH
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	(42)	(43)
Other comprehensive income (loss)	(3)	5
Balance	(45)	(38)
Unrecognized Amounts on Retirement Benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	(390)	(318)
Other comprehensive income (loss)	(4)	15
Balance	(394)	(303)
Unrecognized Amounts on Retirement Benefits | EEGH
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	(1)	(6)
Other comprehensive income (loss)	(1)	1
Balance	(2)	(5)
Unrealized Losses on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	135	59
Other comprehensive income (loss)	(55)	77
Balance	80	136
Unrealized Losses on Cash Flow Hedges | EEGH
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	(43)	(42)
Other comprehensive income (loss)	(2)	4
Balance	(45)	(38)
Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	(2)	(5)
Other comprehensive income (loss)	0	0
Balance	(2)	(5)
Noncontrolling Interest | EEGH
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	(2)	(5)
Other comprehensive income (loss)	0	0
Balance	$ (2)	$ (5)