Consolidated Statements of Income - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
REVENUES:
Total revenues	[1]	$ 10,790	$ 11,035	$ 11,261
OPERATING EXPENSES:
Fuel		369	497	538
Purchased power		2,701	2,927	3,109
Other operating expenses		3,291	2,952	3,133
Provision for depreciation		1,274	1,220	1,136
Deferral of regulatory assets, net		(53)	(79)	(150)
General taxes		1,046	1,008	993
Total operating expenses		8,628	8,525	8,759
OPERATING INCOME		2,162	2,510	2,502
OTHER INCOME (EXPENSE):
Miscellaneous income, net		432	243	205
Pension and OPEB mark-to-market adjustment		(477)	(674)	(144)
Interest expense		(1,065)	(1,033)	(1,116)
Capitalized financing costs		77	71	65
Total other expense		(1,033)	(1,393)	(990)
INCOME BEFORE INCOME TAXES		1,129	1,117	1,512
INCOME TAXES		126	213	490
INCOME FROM CONTINUING OPERATIONS		1,003	904	1,022
Discontinued operations (Note 3)	[2]	76	8	326
NET INCOME		1,079	912	1,348
INCOME ALLOCATED TO PREFERRED STOCKHOLDERS (Note 1)		0	4	367
NET INCOME ATTRIBUTABLE TO COMMON STOCKHOLDERS		$ 1,079	$ 908	$ 981
EARNINGS PER SHARE OF COMMON STOCK:
Basic - Continuing Operations (in dollars per share)		$ 1.85	$ 1.69	$ 1.33
Basic - Discontinued Operations (in dollars per share)		0.14	0.01	0.66
Basic - Net Income Attributable to Common Stockholders (in dollars per share)		1.99	1.70	1.99
Diluted - Continuing Operations (in dollars per share)		1.85	1.67	1.33
Diluted - Discontinued Operations (in dollars per share)		0.14	0.01	0.66
Diluted - Net Income Attributable to Common Stockholders (in dollars per share)		$ 1.99	$ 1.68	$ 1.99
WEIGHTED AVERAGE NUMBER OF COMMON SHARES OUTSTANDING:
Basic (in shares)		542	535	492
Diluted (in shares)		543	542	494
Distribution services and retail generation
REVENUES:
Total revenues		$ 8,688	$ 8,720	$ 8,937
Transmission
REVENUES:
Total revenues		1,613	1,510	1,335
Other
REVENUES:
Total revenues		$ 489	$ 805	$ 989

[1] Includes excise and gross receipts tax collections of $362 million, $373 million and $386 million in 2020, 2019 and 2018, respectively.

[2] Net of income tax benefit of $59 million, $5 million, and $1.3 billion in 2020, 2019 and 2018, respectively.