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Earnings (Loss) per Share - Schedule of Earnings per Share (Detail) - USD ($) $ in Millions | 12 Months Ended
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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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