Consolidated Statements of Equity - USD ($) $ in Millions	Total	Common Stock Shares	Common Stock Amount	Accumulated Other Comprehensive Loss	Retained Earnings
Balance, shares at Dec. 31, 2018		89,267,959
Balance at Dec. 31, 2018	$ 2,506		$ 1,212	$ (7)	$ 1,301
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued pursuant to equity-based plans		119,165
Proceeds from issuance of shares pursuant to equity-based plans	1		1
Stock-based compensation	$ 7		7	0	0
Common Stock, Dividends, Per Share, Declared	$ 1.5175
Dividends declared	$ (136)		0	0	(136)
Net income	214		0	0	214
Increase(Decrease) in Equity due to stranded tax effects due to Tax Reform				(2)	2
Other comprehensive income (loss)	(1)		0	(1)	0
Balance, shares at Dec. 31, 2019		89,387,124
Balance at Dec. 31, 2019	2,591		1,220	(10)	1,381
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued pursuant to equity-based plans		150,207
Proceeds from issuance of shares pursuant to equity-based plans	2		2
Stock-based compensation	$ 9		9	0	0
Common Stock, Dividends, Per Share, Declared	$ 1.5850
Dividends declared	$ (143)		0	0	(143)
Net income	155		0	0	155
Other comprehensive income (loss)	(1)		0	(1)	0
Balance, shares at Dec. 31, 2020		89,537,331
Balance at Dec. 31, 2020	2,613		1,231	(11)	1,393
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued pursuant to equity-based plans		123,281
Proceeds from issuance of shares pursuant to equity-based plans	0		0
Stock-based compensation	13		$ 13	0	0
Stock Repurchased During Period, Value	$ (12)			0	9
Stock Repurchased During Period, Shares		(250,000)	(3,000,000)
Common Stock, Dividends, Per Share, Declared	$ 1.6975
Dividends declared	$ (152)		$ 0	0	(152)
Net income	244		0	0	244
Other comprehensive income (loss)	1		0	1	0
Balance, shares at Dec. 31, 2021		89,410,612
Balance at Dec. 31, 2021	$ 2,707		$ 1,241	$ (10)	$ 1,476