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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