Consolidated Condensed Statements of Capital (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Beginning balance	$ 3,845	$ 3,401	$ 3,695	$ 3,303
Net income	117	107	194	171
Equity contributions from Parent	120	110	265	220
Dividends to Parent	(77)	(64)	(150)	(140)
Other	(2)		(1)
Ending balance	4,003	3,554	4,003	3,554
Common Stock [Member]
Beginning balance	$ 3,530	$ 3,100	$ 3,385	$ 2,990
Beginning balance	10	10	10	10
Equity contributions from Parent	$ 120	$ 110	$ 265	$ 220
Ending balance	$ 3,650	$ 3,210	$ 3,650	$ 3,210
Ending balance	10	10	10	10
Retained Earnings [Member]
Beginning balance	$ 316	$ 302	$ 311	$ 314
Net income	117	107	194	171
Dividends to Parent	(77)	(64)	(150)	(140)
Other	(2)		(1)
Ending balance	354	345	354	345
Accumulated Other Comprehensive Loss [Member]
Beginning balance	(1)	(1)	(1)	(1)
Ending balance	$ (1)	$ (1)	$ (1)	$ (1)