Segment Information - Reportable Segments and Reconciliation to Consolidated Net Income (Detail) (USD $) In Millions, unless otherwise specified	3 Months Ended																12 Months Ended
	Dec. 31, 2013		Sep. 30, 2013		Jun. 30, 2013		Mar. 31, 2013		Dec. 31, 2012		Sep. 30, 2012		Jun. 30, 2012		Mar. 31, 2012		Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Segment Reporting Disclosure [Line Items]
Net sales	$ 25,587	[1]	$ 17,092	[1]	$ 15,704	[1]	$ 16,070	[1]	$ 21,268	[1]	$ 13,806	[1]	$ 12,834	[1]	$ 13,185	[1]	$ 74,452		$ 61,093		$ 48,077
Segment operating expenses																	73,707		60,417		47,215
Income from operations	510	[1]	(25)	[1]	79	[1]	181	[1]	405	[1]	(28)	[1]	107	[1]	192	[1]	745		676		862
Stock-based compensation																	(1,134)		(833)		(557)
Other operating income (expense), net																	(114)		(159)		(154)
Total non-operating income (expense)																	(239)		(132)		72
Provision for income taxes	(179)	[1]	12	[1]	(13)	[1]	18	[1]	(194)	[1]	(83)	[1]	(109)	[1]	(43)	[1]	(161)		(428)		(291)
Equity-method investment activity, net of tax																	(71)		(155)		(12)
Net income (loss)	239	[1]	(41)	[1]	(7)	[1]	82	[1]	97	[1]	(274)	[1]	7	[1]	130	[1]	274		(39)		631
Operating Segments
Segment Reporting Disclosure [Line Items]
Net sales																	74,452		61,093		48,077
Segment operating expenses																	72,459	[2]	59,425	[2]	46,504	[2]
Income from operations																	1,993		1,668		1,573
Operating Segments | North America
Segment Reporting Disclosure [Line Items]
Net sales																	44,517		34,813		26,705
Segment operating expenses																	42,631	[2]	33,221	[2]	25,772	[2]
Income from operations																	1,886		1,592		933
Operating Segments | International
Segment Reporting Disclosure [Line Items]
Net sales																	29,935		26,280		21,372
Segment operating expenses																	29,828	[2]	26,204	[2]	20,732	[2]
Income from operations																	$ 107		$ 76		$ 640

[1] The sum of quarterly amounts, including per share amounts, may not equal amounts reported for year-to-date periods. This is due to the effects of rounding and changes in the number of weighted-average shares outstanding for each period.

[2] Represents operating expenses, excluding stock-based compensation and “Other operating expense (income), net,” which are not allocated to segments.