Shareholders' Equity (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended						6 Months Ended
	Jun. 30, 2022	Mar. 31, 2022		Jun. 30, 2021	Mar. 31, 2021		Jun. 30, 2022	Jun. 30, 2021
Shareholders' equity activity [Roll Forward]
Beginning Balance	$ 7,033	$ 6,728		$ 5,179	$ 4,983		$ 6,728	$ 4,983
Net income (loss)	117	264		230	171		381	401
Other comprehensive income (loss)	(1)	5		2			4	2
Cash dividends	(109)	(108)		(40)	(40)
Stock plans	114	144		61	66
Other	6			3	1
Ending Balance	$ 7,148	$ 7,033		$ 5,429	$ 5,179		7,148	5,429
Common Stock, Dividends, Per Share, Declared	$ 0.12	$ 0.12		$ 0.045	$ 0.045
Common Shares
Shareholders' equity activity [Roll Forward]
Beginning Balance	$ 2,665	$ 2,665		$ 2,666	$ 2,666		2,665	2,666
Net income (loss)	0	0		0	0
Other comprehensive income (loss)	0	0		0
Cash dividends	0	0		0	0
Stock plans	0	0		0	0
Other	0			0	0
Ending Balance	2,665	2,665		2,666	2,666		2,665	2,666
Paid-in Capital in Excess of Par Value
Shareholders' equity activity [Roll Forward]
Beginning Balance	0	32		34	0		32	0
Net income (loss)	0	0		0	0
Other comprehensive income (loss)	0	0		0
Cash dividends	0	0		0	0
Stock plans	0	32		(8)	34
Other	0			0	0
Ending Balance	0	0		26	34		0	26
Treasury Stock
Shareholders' equity activity [Roll Forward]
Beginning Balance	(5,250)	(5,511)		(5,877)	(6,021)		(5,511)	(6,021)
Net income (loss)	0	0		0	0
Other comprehensive income (loss)	0	0		0
Cash dividends	0	0		0	0
Stock plans	277	261		69	144
Other	0			0	0
Ending Balance	(4,973)	(5,250)		(5,808)	(5,877)		(4,973)	(5,808)
Retained Earnings
Shareholders' equity activity [Roll Forward]
Beginning Balance	9,780	9,710		8,709	8,691		9,710	8,691
Net income (loss)	109	263		227	170
Other comprehensive income (loss)	0	0		0
Cash dividends	(109)	(108)		(40)	(40)
Stock plans	163	85	[1]	0	112	[2]
Other	0			0	0
Ending Balance	9,617	9,780		8,896	8,709		9,617	8,896
Accumulated Other Comprehensive Income (Loss)
Shareholders' equity activity [Roll Forward]
Beginning Balance	(178)	(183)		(362)	(362)		(183)	(362)
Net income (loss)	0	0		0	0
Other comprehensive income (loss)	(1)	5		2
Cash dividends	0	0		0	0
Stock plans	0	0		0	0
Other	0			0	0
Ending Balance	(179)	(178)		(360)	(362)		(179)	(360)
Noncontrolling Interest in Consolidated Subsidiaries
Shareholders' equity activity [Roll Forward]
Beginning Balance	16	15		9	9		15	9
Net income (loss)	8	1		3	1
Other comprehensive income (loss)	0	0		0
Cash dividends	0	0		0	0
Stock plans	0	0		0	0
Other	6			3	1
Ending Balance	$ 18	$ 16		$ 9	$ 9		$ 18	$ 9

[1] In the first and second quarter of 2022, we issued common stock from treasury shares for stock options exercised, restricted stock grants, and our employee stock purchase plan. As a result, additional paid in capital was reduced below zero, which resulted in a reduction of retained earnings by $85 million and $163 million, respectively. Additional issuances from treasury shares could similarly impact additional paid in capital and retained earnings.

[2] In January of 2021, we issued common stock from treasury shares for stock options exercised, restricted stock grants, and our employee stock purchase plan. As a result, additional paid in capital was reduced below zero, which resulted in a reduction of retained earnings by $112 million. Additional issuances from treasury shares could similarly impact additional paid in capital and retained earnings.