Stockholders' Equity - Common Stock Repurchased (Details) - USD ($) $ / shares in Units, $ in Millions			12 Months Ended
	Jan. 28, 2021	Mar. 10, 2020	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Equity [Abstract]
Common stock repurchased (in shares)	13,000,000	45,000,000	98,748,905	47,736,847	16,962,199
Average purchase price per share (in dollars per share)			$ 17.37	$ 9.66	$ 9.86
Shares repurchased related to employee stock-based compensation plans (in shares)			1,368,942	1,197,843	1,369,630
Average purchase price per share (in dollars per share)			$ 14.70	$ 10.93	$ 10.85
Common shares issued (in shares)			3,786,581	3,129,325	3,743,705
Shares related to settlement of common stock tender offer			28,500,000
2021 Share Repurchase Program
Class of Stock [Line Items]
Remaining capacity			$ 38