Consolidated Condensed Statements of Capital (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Beginning balance	$ 4,538	$ 4,003	$ 4,216	$ 3,695
Net income	149	141	362	335
Equity contributions from Parent	150	135	440	400
Dividends to Parent	(121)	(116)	(302)	(266)
Other		1
Ending balance	4,716	4,164	4,716	4,164
Common Stock [Member]
Beginning balance	$ 4,180	$ 3,650	$ 3,890	$ 3,385
Beginning balance	10	10	10	10
Equity contributions from Parent	$ 150	$ 135	$ 440	$ 400
Ending balance	$ 4,330	$ 3,785	$ 4,330	$ 3,785
Ending balance	10	10	10	10
Retained Earnings [Member]
Beginning balance	$ 359	$ 354	$ 327	$ 311
Net income	149	141	362	335
Dividends to Parent	(121)	(116)	(302)	(266)
Other		1
Ending balance	387	380	387	380
Accumulated Other Comprehensive Loss [Member]
Beginning balance	(1)	(1)	(1)	(1)
Ending balance	$ (1)	$ (1)	$ (1)	$ (1)