Consolidated Condensed Statements of Capital (Unaudited) $ in Millions	3 Months Ended
	Mar. 31, 2019 USD ($) shares
Beginning balance	$ 3,303
Net income	64
Equity contributions from Parent	110
Dividends to Parent	(76)
Ending balance	3,401
Common Stock [Member]
Beginning balance	$ 2,990
Beginning balance | shares	10
Equity contributions from Parent	$ 110
Ending balance	$ 3,100
Ending balance | shares	10
Retained Earnings [Member]
Beginning balance	$ 314
Net income	64
Dividends to Parent	(76)
Ending balance	302
Accumulated Other Comprehensive Loss [Member]
Beginning balance	(1)
Ending balance	$ (1)