Components of Accumulated Other Comprehensive Loss, Net - EEGH (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	$ 46,977	$ 32,578	$ 29,723
Other comprehensive income	217	154	239
Ending balance	50,589	46,977	32,578
Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(1,552)	(1,706)	(1,945)
Other comprehensive income	212	154	239
Ending balance	(1,340)	(1,552)	(1,706)
Unrecognized Amounts on Retirement Benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(492)	(417)	(358)
Other comprehensive income	174	(65)	(59)
Ending balance	(318)	(492)	(417)
Unrealized Gains (Losses) on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(8)	7	36
Other comprehensive income	67	(15)	(29)
Ending balance	59	(8)	7
Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(10)	0	0
Ending balance	(5)	(10)	0
Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	3,967	129	130
Other comprehensive income	5	0	0
Ending balance	3,895	3,967	129
EEGH
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	6,995	10,229	8,865
Other comprehensive income	15	124	(18)
Ending balance	7,494	6,995	10,229
EEGH | Accumulated Other Comprehensive Income (Loss)
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(53)	(187)	(169)
Other comprehensive income	10	134	(17)
Ending balance	(43)	(53)	(187)
EEGH | Unrecognized Amounts on Retirement Benefits
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(12)	(106)	(144)
Other comprehensive income	6	94	38
Ending balance	(6)	(12)	(106)
EEGH | Unrealized Gains (Losses) on Cash Flow Hedges
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(51)	(81)	(25)
Other comprehensive income	9	30	(56)
Ending balance	(42)	(51)	(81)
EEGH | Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	(10)	0	0
Other comprehensive income			0
Ending balance	(5)	(10)	0
EEGH | Noncontrolling Interest
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]
Beginning balance	4,091	1,385	2,664
Other comprehensive income	5	(10)	(1)
Ending balance	$ 4,036	$ 4,091	$ 1,385