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Stockholders' Equity - Additional Information (Detail) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity [Abstract]
Common stock, shares authorized	4,500,000,000
Common stock, par value	$ 0.01
Common stock, shares outstanding	1,382,964,324	1,383,932,776
Preferred stock, shares authorized	200,000,000
Preferred stock, par value	$ 0.01
Preferred stock, issued	0
Other comprehensive income (loss)	$ (239)	$ 369	$ (85)

X

- Definition

Face amount or stated value per share of common stock.

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The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Number of shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Amount after tax and reclassification adjustments of other comprehensive income (loss).

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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Total number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) issued to shareholders (includes related preferred shares that were issued, repurchased, and remain in the treasury). May be all or portion of the number of preferred shares authorized. Excludes preferred shares that are classified as debt.

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