CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) shares in Millions, $ in Millions		Total		Common Stock		Additional Paid-in Capital	Retained Earnings	Treasury Stock	Accumulated Other Comprehensive Loss	[2]
Balance (in shares) at Dec. 31, 2020				72	[1]			42
Balance at Dec. 31, 2020				$ 1		$ 2,482	$ 6,165	$ (3,957)	$ (146)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		$ 203					203
Foreign currency translation adjustments		5	[3]						5	[4]
Fixed price diesel swaps		1							1
Stock compensation expense, net (in shares)	[1]			0
Stock compensation expense, net						21
Shares repurchased and retired						(30)
Balance (in shares) at Mar. 31, 2021				72	[1]			42
Balance at Mar. 31, 2021				$ 1		2,473	6,368	$ (3,957)	(140)
Balance (in shares) at Dec. 31, 2021				72	[1]			42
Balance at Dec. 31, 2021		5,991		$ 1		2,567	7,551	$ (3,957)	(171)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income		367					367
Foreign currency translation adjustments		17	[3]						17
Fixed price diesel swaps		3							3
Stock compensation expense, net (in shares)				1
Stock compensation expense, net						24
Shares repurchased and retired						(56)
Repurchase of common stock (in shares)				(1)	[1]			(1)
Repurchase of common stock								$ (262)
Balance (in shares) at Mar. 31, 2022				72	[1]			43
Balance at Mar. 31, 2022		$ 6,084		$ 1		$ 2,535	$ 7,918	$ (4,219)	$ (151)

[1] Common stock outstanding increased by less than 1 million net shares during the year ended December 31, 2021.

[2] The Accumulated Other Comprehensive Loss balance primarily reflects foreign currency translation adjustments

[3] There were no material reclassifications from accumulated other comprehensive loss reflected in other comprehensive income (loss) during 2022 or 2021. There was no material tax impact related to the foreign currency translation adjustments. We have historically considered the undistributed earnings of our foreign subsidiaries to be indefinitely reinvested, and, accordingly, no taxes were provided on such earnings prior to 2020. In 2020 and 2021, we identified cash in our foreign operations in excess of near-term working capital needs that could no longer be considered indefinitely reinvested. As a result, our prior assertion that all undistributed earnings of our foreign subsidiaries should be considered indefinitely reinvested changed. In 2021, we remitted $203 of cash from foreign operations (such amount represents the cumulative amount of identified cash in our foreign operations in excess of near-term working capital needs). We continue to expect that the remaining balance of our undistributed foreign earnings will be indefinitely reinvested. If we determine that all or a portion of such foreign earnings are no longer indefinitely reinvested, we may be subject to additional foreign withholding taxes and U.S. state income taxes. There were no material taxes associated with other comprehensive income (loss) during 2022 or 2021.

[4] .