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Stockholders' Equity - Summary of Breakdown of Common Stock and Additional Paid-in Capital (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019
Disclosure of classes of share capital [abstract]
Common stock	$ 318	$ 318
Additional paid-in capital	7,575	10,106
Common stock and additional paid-in capital	$ 7,893	$ 10,424

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- Definition

Common stock and additional paid in capital.

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- Definition

The amount received or receivable from the issuance of the entity's shares in excess of nominal value and amounts received from other transactions involving the entity's stock or stockholders.

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- Definition

The nominal value of capital issued.

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