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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, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Amounts allocated to segments:
Segments profit	$ (81)	$ 16	$ (591)	$ 1,527
Amounts not allocated to segments:
Amortization	255	297	823	909
Other assets impairments, restructuring and other items	160	139	263	834
Goodwill impairment				300
Intangible asset impairments	177	519	1,206	1,246
Gain on divestitures, net of divestitures related costs	(3)	(31)	(12)	(114)
Other R&D expenses (income)	(7)	60	(7)	82
Costs related to regulatory actions taken in facilities	11	1	28	6
Legal settlements and loss contingencies	468	19	1,171	(1,239)
Other unallocated amounts	72	84	201	226
Consolidated operating income (loss)	(81)	16	(591)	1,527
Financial expenses, net	211	229	635	736
Consolidated income (loss) before income taxes	(292)	(213)	(1,226)	791
North America [Member]
Amounts allocated to segments:
Segments profit	565	649	1,566	2,286
Amounts not allocated to segments:
Consolidated operating income (loss)	565	649	1,566	2,286
Europe [Member]
Amounts allocated to segments:
Segments profit	341	297	1,060	1,020
Amounts not allocated to segments:
Consolidated operating income (loss)	341	297	1,060	1,020
International Markets [Member]
Amounts allocated to segments:
Segments profit	130	123	363	384
Amounts not allocated to segments:
Consolidated operating income (loss)	130	123	363	384
Corporate Segment [Member]
Amounts allocated to segments:
Segments profit	1,036	1,069	2,989	3,690
Amounts not allocated to segments:
Consolidated operating income (loss)	1,036	1,069	2,989	3,690
Other Segments [Member]
Amounts allocated to segments:
Segments profit	16	35	92	87
Amounts not allocated to segments:
Consolidated operating income (loss)	16	35	92	87
Segments and Other Activities [Member]
Amounts allocated to segments:
Segments profit	1,051	1,104	3,081	3,777
Amounts not allocated to segments:
Consolidated operating income (loss)	$ 1,051	$ 1,104	$ 3,081	$ 3,777

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