Consolidated Condensed Statements of Capital (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Beginning balance	$ 3,554	$ 3,182	$ 3,303	$ 2,978
Net income	126	118	297	266
Other comprehensive income, after tax				1
Equity contributions from Parent	25	120	245	335
Dividends to Parent	(107)	(84)	(247)	(244)
Other	1		1
Ending balance	3,599	3,336	3,599	3,336
Common Stock [Member]
Beginning balance	$ 3,210	$ 2,860	$ 2,990	$ 2,645
Beginning balance	10	10	10	10
Equity contributions from Parent	$ 25	$ 120	$ 245	$ 335
Ending balance	$ 3,235	$ 2,980	$ 3,235	$ 2,980
Ending balance	10	10	10	10
Retained Earnings [Member]
Beginning balance	$ 345	$ 323	$ 314	$ 335
Net income	126	118	297	266
Dividends to Parent	(107)	(84)	(247)	(244)
Other	1		1
Ending balance	365	357	365	357
Accumulated Other Comprehensive Loss [Member]
Beginning balance	(1)	(1)	(1)	(2)
Other comprehensive income, after tax				1
Ending balance	$ (1)	$ (1)	$ (1)	$ (1)