CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (UNAUDITED) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Comprehensive income:
Net income	$ 215	$ 218	$ 516	$ 455
Derivative instruments:
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), Reclassification, before Tax	0	0	1	1
Total other comprehensive income	0	0	1	1
Total comprehensive income	$ 215	$ 218	$ 517	$ 456