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CONSOLIDATED STATEMENTS OF INCOME (Parenthetical) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Stock-based compensation expense	$ 2,649	$ 1,974	$ 1,376
Research and Development Expense
Stock-based compensation expense	1,325	1,061	861
Sales and Marketing Expense
Stock-based compensation expense	498	361	261
General and Administrative Expense
Stock-based compensation expense	453	303	187
Google \| Cost of Revenues
Stock-based compensation expense	359	249	67
Motorola Mobile \| Cost of Revenues
Stock-based compensation expense	$ 14	$ 0	$ 0

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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