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Common Shares - Share Capital (Detail) - USD ($) $ in Millions	Jun. 30, 2018	Dec. 31, 2017	Sep. 12, 2017	May 10, 2005
Equity [Abstract]
Authorized share capital	800,000,000	800,000,000
Issued and fully paid share capital	508,763,020	508,763,020		6,000
Treasury shares held by the Company	(4,244,080)	(4,244,080)
Outstanding common shares in issue	504,518,940	504,518,940	504,518,940
Authorized share capital	$ 1,600	$ 1,600
Issued and fully paid share capital	1,017	1,017
Treasury shares held by the Company	(9)	(9)
Outstanding common shares in issue	$ 1,008	$ 1,008

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Common Stock Shares Authorized Value

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Common stock shares issued value.

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- Definition

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

+ References

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(29))
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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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

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Value of all classes of common stock held by shareholders. May be all or portion of the number of common shares authorized. These shares exclude common shares repurchased by the entity and held as treasury shares.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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