Segments - Summary of Segment Profit (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Gross profit	$ 2,021	$ 2,650	$ 6,430	$ 8,344
R&D expenses	(311)	(531)	(918)	(1,432)
S&M expenses	(743)	(843)	(2,224)	(2,745)
G&A expenses	(309)	(372)	(954)	(1,101)
Segment profit	16	378	1,527	(4,467)
North America [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	2,265	3,043	7,059	9,452
Gross profit	1,232	1,833	3,867	5,971
R&D expenses	158	230	528	777
S&M expenses	301	325	902	1,158
G&A expenses	128	149	357	432
Other income	(4)	(1)	(206)	(82)
Segment profit	649	1,130	2,286	3,686
Europe [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	1,212	1,380	3,982	4,016
Gross profit	683	721	2,211	2,147
R&D expenses	62	101	208	312
S&M expenses	250	289	741	864
G&A expenses	73	90	243	258
Other income	1		(1)	(15)
Segment profit	297	241	1,020	728
International Markets [Member]
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Revenues	726	882	2,265	2,485
Gross profit	301	351	942	1,043
R&D expenses	21	35	70	129
S&M expenses	120	158	384	503
G&A expenses	37	51	115	144
Other income		(3)	(11)	(4)
Segment profit	$ 123	$ 110	$ 384	$ 271

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

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