Segments - Summary of Segment Profit (Detail) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	$ 4,337	$ 4,701	$ 8,632	$ 9,766
Gross profit	1,893	2,033	3,749	4,348
R&D expenses	276	290	537	607
S&M expenses	666	682	1,313	1,420
G&A expenses	296	316	589	645
Segment profit	(644)	(14)	(510)	1,511
North America [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	2,071	2,263	4,118	4,794
Gross profit	1,067	1,179	2,107	2,582
R&D expenses	175	182	340	370
S&M expenses	269	272	537	548
G&A expenses	117	103	230	229
Other (income) expense	2	(100)	(2)	(202)
Segment profit	504	722	1,001	1,637
Europe [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	1,183	1,328	2,448	2,770
Gross profit	674	727	1,404	1,519
R&D expenses	70	73	136	146
S&M expenses	216	233	431	483
G&A expenses	70	78	119	169
Other (income) expense	1	(3)	(1)	(2)
Segment profit	316	346	719	723
International Markets [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	741	789	1,409	1,539
Gross profit	312	328	582	641
R&D expenses	24	25	46	49
S&M expenses	119	130	234	264
G&A expenses	34	37	70	78
Other (income) expense	(1)	(3)	(1)	(11)
Segment profit	$ 136	$ 139	$ 233	$ 261

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The aggregate total of expenses of managing and administering the affairs of an entity, including affiliates of the reporting entity, which are not directly or indirectly associated with the manufacture, sale or creation of a product or product line.

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The costs incurred in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; or to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, excluding in-process research and development acquired in a business combination consummated during the period. Excludes software research and development, which has a separate concept.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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The aggregate total amount of expenses directly related to the marketing or selling of products or services.

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