Consolidated Condensed Statements of Capital (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Beginning balance	$ 4,003	$ 3,554	$ 3,695	$ 3,303
Net income	141	126	335	297
Equity contributions from Parent	135	25	400	245
Dividends to Parent	(116)	(107)	(266)	(247)
Other	1	1		1
Ending balance	4,164	3,599	4,164	3,599
Common Stock [Member]
Beginning balance	$ 3,650	$ 3,210	$ 3,385	$ 2,990
Beginning balance	10	10	10	10
Equity contributions from Parent	$ 135	$ 25	$ 400	$ 245
Ending balance	$ 3,785	$ 3,235	$ 3,785	$ 3,235
Ending balance	10	10	10	10
Retained Earnings [Member]
Beginning balance	$ 354	$ 345	$ 311	$ 314
Net income	141	126	335	297
Dividends to Parent	(116)	(107)	(266)	(247)
Other	1	1		1
Ending balance	380	365	380	365
Accumulated Other Comprehensive Loss [Member]
Beginning balance	(1)	(1)	(1)	(1)
Ending balance	$ (1)	$ (1)	$ (1)	$ (1)