Consolidated Condensed Statements of Capital (Unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Beginning balance	$ 4,216	$ 3,695
Net income	92	77
Equity contributions from Parent	155	145
Dividends to Parent	(88)	(73)
Other		1
Ending balance	4,375	3,845
Common Stock [Member]
Beginning balance	$ 3,890	$ 3,385
Beginning balance	10	10
Equity contributions from Parent	$ 155	$ 145
Ending balance	$ 4,045	$ 3,530
Ending balance	10	10
Retained Earnings [Member]
Beginning balance	$ 327	$ 311
Net income	92	77
Dividends to Parent	(88)	(73)
Other		1
Ending balance	331	316
Accumulated Other Comprehensive Loss [Member]
Beginning balance	(1)	(1)
Ending balance	$ (1)	$ (1)