Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Statement of Comprehensive Income [Abstract]
Net Income	$ 923	$ 796	$ 524
Defined benefit plans
Plan sponsored by equity affiliates, net of income taxes	0	0	0
Other comprehensive income	0	0	0
Comprehensive Income	$ 923	$ 796	$ 524