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Earnings (Loss) per Share - Schedule of Earnings per Share (Detail) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income (loss) used for the computation of diluted earnings per share	$ (2,399)	$ (16,525)	$ 68
Weighted average number of shares used in the computation of basic earnings per share	1,021	1,016	955
Additional shares from the assumed exercise of employee stock options and unvested RSUs			3
Weighted average number of additional shares issued upon the assumed conversion of convertible senior debentures			3
Weighted average number of shares used in the computation of diluted earnings per share	1,021	1,016	961

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of convertible debt securities using the if-converted method.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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