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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	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Amounts allocated to segments:
Segments profit	$ 623	$ (4,342)	$ 1,638	$ (3,978)
Amounts not allocated to segments:
Amortization	199	251	613	758
Other assets impairments, restructuring and other items	62	(98)	227	404
Goodwill impairment	0	4,628	0	4,628
Intangible asset impairments	21	509	295	1,278
Legal settlements and loss contingencies	3	21	113	10
Other unallocated amounts	134	55	266	148
Consolidated operating income (loss)	623	(4,342)	1,638	(3,978)
Financial expenses, net	241	117	805	565
Income (loss) before income taxes	382	(4,459)	833	(4,543)
North America [Member]
Amounts allocated to segments:
Segments profit	458	560	1,556	1,682
Amounts not allocated to segments:
Consolidated operating income (loss)	458	560	1,556	1,682
Europe [Member]
Amounts allocated to segments:
Segments profit	394	312	1,074	1,058
Amounts not allocated to segments:
Consolidated operating income (loss)	394	312	1,074	1,058
International Markets [Member]
Amounts allocated to segments:
Segments profit	152	125	398	378
Amounts not allocated to segments:
Consolidated operating income (loss)	152	125	398	378
Corporate Segment [Member]
Amounts allocated to segments:
Segments profit	1,004	997	3,028	3,118
Amounts not allocated to segments:
Consolidated operating income (loss)	1,004	997	3,028	3,118
Other Segments [Member]
Amounts allocated to segments:
Segments profit	38	28	125	130
Amounts not allocated to segments:
Consolidated operating income (loss)	38	28	125	130
Segments and Other Activities [Member]
Amounts allocated to segments:
Segments profit	1,042	1,025	3,153	3,248
Amounts not allocated to segments:
Consolidated operating income (loss)	$ 1,042	$ 1,025	$ 3,153	$ 3,248

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