Components of Accumulated Other Comprehensive Loss, Net - EEGH (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	$ 50,424	$ 47,051	$ 50,589	$ 46,977
Other comprehensive income (loss)	(430)	84	(448)	196
Balance	51,191	49,365	51,191	49,365
EEGH
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	7,590	7,078	7,494	6,995
Other comprehensive income (loss)	(1)	5	4	17
Balance	7,717	7,398	7,717	7,398
Accumulated Other Comprehensive (Loss) Income, Net
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	(1,358)	(1,440)	(1,340)	(1,552)
Other comprehensive income (loss)	(430)	80	(448)	192
Balance	(1,788)	(1,360)	(1,788)	(1,360)
Accumulated Other Comprehensive (Loss) Income, Net | EEGH
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance	(38)	(45)	(43)	(53)
Other comprehensive income (loss)	(1)	5	4	13
Balance	(39)	(40)	(39)	(40)
Unrecognized Amounts on Retirement Benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance			(318)	(492)
Other comprehensive income (loss)			40	22
Balance	(278)	(470)	(278)	(470)
Unrecognized Amounts on Retirement Benefits | EEGH
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance			(6)	(12)
Other comprehensive income (loss)			1	4
Balance	(5)	(8)	(5)	(8)
Unrealized Losses on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance			59	(8)
Other comprehensive income (loss)			103	15
Balance	162	7	162	7
Unrealized Losses on Cash Flow Hedges | EEGH
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance			(42)	(51)
Other comprehensive income (loss)			3	13
Balance	(39)	(38)	(39)	(38)
Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance			(5)	(10)
Other comprehensive income (loss)			0	4
Balance	(5)	(6)	(5)	(6)
Noncontrolling Interest | EEGH
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Balance			(5)	(10)
Other comprehensive income (loss)			0	4
Balance	$ (5)	$ (6)	$ (5)	$ (6)