Consolidated Statement of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 255	$ 233	$ 481	$ 431
Defined benefit plans
Plan sponsored by equity affiliates, net of income taxes	0	0	0	0
Other comprehensive income	0	0	0	0
Comprehensive Income	$ 255	$ 233	$ 481	$ 431