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

[1] In the first 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. 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.