ORGANIZATION AND BASIS OF PRESENTATION - Property, Plant and Equipment Balances (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020
Property, Plant and Equipment
In Service	$ 46,002	$ 43,726
Accum. Depr.	(12,672)	(11,965)
Net Plant	33,330	31,761
CWIP	1,414	1,578
Total	34,744	33,339
Finance leases	36	45
Finance leases	143	153
Regulated Distribution
Property, Plant and Equipment
In Service	31,154	29,775
Accum. Depr.	(9,284)	(8,800)
Net Plant	21,870	20,975
CWIP	774	841
Total	22,644	21,816
Regulated Transmission
Property, Plant and Equipment
In Service	13,744	12,912
Accum. Depr.	(2,789)	(2,609)
Net Plant	10,955	10,303
CWIP	580	671
Total	11,535	10,974
Corporate/Other
Property, Plant and Equipment
In Service	1,104	1,039
Accum. Depr.	(599)	(556)
Net Plant	505	483
CWIP	60	66
Total	$ 565	$ 549