CONSOLIDATED STATEMENT OF COMPREHENSIVE INCOME - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income		$ 1,158	$ 201	$ 681
Postretirement benefits:
Net actuarial gain (loss)	[1]	0	1	(2)
Amortization of prior service cost	[2]	(1)	(1)	(1)
Total other comprehensive income		(1)	0	(3)
Comprehensive income		$ 1,157	$ 201	$ 678

[1] Net of income taxes of less than $1 million for each of the years ended December 31, 2021, 2020 and 2019.

[2] Net of income taxes of less than $1 million for each of the years ended December 31, 2021, 2020 and 2019.