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Stockholders' Equity - Common Stock Repurchased (Details) - USD ($) $ / shares in Units, $ in Millions		12 Months Ended
	Mar. 10, 2020	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Equity [Abstract]
Common stock repurchased (in shares)	44,900,000	47,736,847	16,962,199	0
Average purchase price per share (in dollars per share)		$ 9.66	$ 9.86	$ 0
Shares repurchased related to employee stock-based compensation plans (in shares)		1,197,843	1,369,630	3,087,396
Average purchase price per share (in dollars per share)		$ 10.93	$ 10.85	$ 11.32
Common shares issued (in shares)		3,129,325	3,743,705	6,392,634
Repurchase amount (in dollars per share)		$ 75

X

- Definition

Treasury Stock Acquired, Average Cost Per Share, Including Commission Costs

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No definition available.

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- Definition

Number of new stock issued during the period.

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- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

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Total cost of shares repurchased divided by the total number of shares repurchased.

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Number of shares that have been repurchased during the period and are being held in treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the par value method.

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