Consolidated Statement of Stockholders' Equity (USD $) In Millions, unless otherwise specified	Total	Common stock	Additional paid-in capital	Treasury stock at cost	Retained earnings	Accumulated Other Comprehensive Income
Stockholders' equity, beginning of period at Dec. 31, 2011		$ 2	$ 11,145	$ (7,155)	$ 13,389	$ 549
Common stock, beginning of year (in shares) at Dec. 31, 2011		1,286
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued		0
Common stock and stock-based awards issued and assumed			312
Stock-based compensation			488
Stock-based awards tax impact			117
Non-controlling interests			0
Common stock repurchased				(898)
Net income	2,609				2,609
Change in unrealized gains on investments	99					99
Change in unrealized gains (losses) on cash flow hedges	(127)					(127)
Foreign currency translation adjustment	337					335
Tax benefit (provision) on above items						0
Common stock issued (in shares)		30
Common stock repurchased/forfeited (in shares)		(22)
Treasury Stock, Value, Acquired, Par Value Method		0
Stockholders' equity, end of period at Dec. 31, 2012	20,865	2	12,062	(8,053)	15,998	856
Common stock, end of period (in shares) at Dec. 31, 2012		1,294
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued		0
Common stock and stock-based awards issued and assumed			173
Stock-based compensation			572
Stock-based awards tax impact			224
Non-controlling interests			0
Common stock repurchased				(1,343)
Net income	2,856				2,856
Change in unrealized gains on investments	234					234
Change in unrealized gains (losses) on cash flow hedges	(51)					(51)
Foreign currency translation adjustment	208					208
Tax benefit (provision) on above items						(91)
Common stock issued (in shares)		25
Common stock repurchased/forfeited (in shares)		(25)
Treasury Stock, Value, Acquired, Par Value Method		0
Stockholders' equity, end of period at Dec. 31, 2013	23,647	2	13,031	(9,396)	18,854	1,156
Common stock, end of period (in shares) at Dec. 31, 2013	1,294	1,294
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued		0
Common stock and stock-based awards issued and assumed			46
Stock-based compensation			693
Stock-based awards tax impact			117
Non-controlling interests			0
Common stock repurchased				(4,658)
Net income	46				46
Change in unrealized gains on investments	108					108
Change in unrealized gains (losses) on cash flow hedges	274					274
Foreign currency translation adjustment	(323)					(323)
Tax benefit (provision) on above items						(44)
Common stock issued (in shares)		18
Common stock repurchased/forfeited (in shares)		(88)
Treasury Stock, Value, Acquired, Par Value Method		0
Stockholders' equity, end of period at Dec. 31, 2014	$ 19,906	$ 2	$ 13,887	$ (14,054)	$ 18,900	$ 1,171
Common stock, end of period (in shares) at Dec. 31, 2014	1,224	1,224