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Segments - Summary of Profit by Segments and Reconciliation of Segments Profit to Consolidated Income Before Income Taxes (Detail) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Amounts allocated to segments:      
Segments profit $ (3,572) $ (443) $ (1,637)
Amounts not allocated to segments:      
Amortization 1,020 1,113 1,166
Other asset impairments, restructuring and other items 479 423 987
Intangible asset impairments 1,502 1,639 1,991
Goodwill impairment 4,628   3,027
Gain on divestitures, net of divestitures related costs (8) (50) (66)
Other R&D expenses (income) 37 (15) 83
Costs related to regulatory actions taken in facilities 23 45 14
Legal settlements and loss contingencies 60 1,178 (1,208)
Other unallocated amounts 219 252 366
Consolidated operating income (loss) (3,572) (443) (1,637)
Financial expenses, net 834 822 959
Income (loss) before income taxes (4,406) (1,265) (2,596)
North America [Member]      
Amounts allocated to segments:      
Segments profit 2,421 2,252 2,837
Amounts not allocated to segments:      
Consolidated operating income (loss) 2,421 2,252 2,837
Europe [Member]      
Amounts allocated to segments:      
Segments profit 1,331 1,318 1,273
Amounts not allocated to segments:      
Consolidated operating income (loss) 1,331 1,318 1,273
International Markets [Member]      
Amounts allocated to segments:      
Segments profit 474 464 498
Amounts not allocated to segments:      
Consolidated operating income (loss) 474 464 498
Corporate Segment [Member]      
Amounts allocated to segments:      
Segments profit 4,225 4,034 4,608
Amounts not allocated to segments:      
Consolidated operating income (loss) 4,225 4,034 4,608
Other Segments [Member]      
Amounts allocated to segments:      
Segments profit 163 108 115
Amounts not allocated to segments:      
Consolidated operating income (loss) 163 108 115
Segments and Other Activities [Member]      
Amounts allocated to segments:      
Segments profit 4,388 4,142 4,723
Amounts not allocated to segments:      
Consolidated operating income (loss) $ 4,388 $ 4,142 $ 4,723