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Business Combinations, Discontinued Operations, Sale of Other Disposal Groups and Selected Financial Information by Reportable Segment and Line of Business - Summary of Condensed Combined Information of the Statement of Operations of Discontinued Operations (Detail) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Disclosure of Discontinued Operations [line items] |  |  |
Revenues | $ 12,970 | $ 13,130 | $ 13,531
Other products (expenses), net | (5) | 1 |
Earnings (loss) before income tax | (1,274) | 253 | 717
Net result of discontinued operations | (120) | 88 | 77
Discontinued Operations [member] |  |  |
Disclosure of Discontinued Operations [line items] |  |  |
Revenues | 189 | 572 | 868
Other products (expenses), net |  |  | (1)
Discontinued Operations [member] | Croatia [Member] |  |  |
Disclosure of Discontinued Operations [line items] |  |  |
Revenues | 189 | 572 | 868
Cost of sales and operating expenses | (184) | (534) | (792)
Other products (expenses), net | (5) | 1 | (1)
Financial expenses, net and others |  |  | (2)
Earnings (loss) before income tax | 0 | 39 | 73
Income tax | (75) | (6) | (7)
Result of discontinued operations | (75) | 33 | 66
Disposal result, withholding taxes and reclassification of currency translation effects | (45) | 55 | 11
Net result of discontinued operations | $ (120) | $ 88 | $ 77

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