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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		12 Months Ended
	Dec. 31, 2017	Jun. 30, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Amounts allocated to segments:
Segment profit			$ (1,637)	$ (17,484)	$ 2,154
Amounts not allocated to segments:
Amortization			1,166	1,444	993
Other asset impairments, restructuring and other items			987	1,836	830
Goodwill impairment	$ 11,000	$ 6,100	3,027	17,100	900
Intangible asset impairments			1,991	3,238	589
Gain on divestitures, net of divestitures related costs			(66)	(1,083)	(720)
Inventory step-up				67	383
Other R&D expenses			83	221	426
Costs related to regulatory actions taken in facilities			14	47	153
Legal settlements and loss contingencies			(1,208)	500	899
Other unallocated amounts			366	187	240
Consolidated operating income (loss)			(1,637)	(17,484)	2,154
Financial expenses, net			959	895	1,330
Consolidated income (loss) before income taxes			(2,596)	(18,379)	824
North America [Member]
Amounts allocated to segments:
Segment profit			2,837	4,624	5,536
Amounts not allocated to segments:
Consolidated operating income (loss)			2,837	4,624	5,536
Europe [Member]
Amounts allocated to segments:
Segment profit			1,273	1,029	667
Amounts not allocated to segments:
Consolidated operating income (loss)			1,273	1,029	667
International Markets [Member]
Amounts allocated to segments:
Segment profit			498	426	636
Amounts not allocated to segments:
Consolidated operating income (loss)			498	426	636
Corporate Segment [Member]
Amounts allocated to segments:
Segment profit			4,608	6,079	6,839
Amounts not allocated to segments:
Consolidated operating income (loss)			4,608	6,079	6,839
Other Segments [Member]
Amounts allocated to segments:
Segment profit			115	(6)	8
Amounts not allocated to segments:
Goodwill impairment				600
Consolidated operating income (loss)			115	(6)	8
Segments and Other Activities [Member]
Amounts allocated to segments:
Segment profit			4,723	6,073	6,847
Amounts not allocated to segments:
Consolidated operating income (loss)			$ 4,723	$ 6,073	$ 6,847

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