Consolidated Condensed Statements of Capital (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021	Jun. 30, 2022	Jun. 30, 2021
Beginning balance	$ 5,000	$ 4,375	$ 4,792	$ 4,216
Net income	145	121	263	213
Equity contributions from Parent	105	135	280	290
Dividends to Parent	(117)	(93)	(202)	(181)
Ending balance	5,133	4,538	5,133	4,538
Common Stock [Member]
Beginning balance	$ 4,645	$ 4,045	$ 4,470	$ 3,890
Beginning balance	10	10	10	10
Equity contributions from Parent	$ 105	$ 135	$ 280	$ 290
Ending balance	$ 4,750	$ 4,180	$ 4,750	$ 4,180
Ending balance	10	10	10	10
Retained Earnings [Member]
Beginning balance	$ 356	$ 331	$ 323	$ 327
Net income	145	121	263	213
Dividends to Parent	(117)	(93)	(202)	(181)
Ending balance	384	359	384	359
Accumulated Other Comprehensive Loss [Member]
Beginning balance	(1)	(1)	(1)	(1)
Ending balance	$ (1)	$ (1)	$ (1)	$ (1)