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Equity Award Plans (Details) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011
2002 Plan
Equity Award Plans
Number of shares authorized	4.3
Stock options
Equity Award Plans
Vesting period (in years)	3 years
Maximum term of options granted	P10Y
Restricted stock units
Equity Award Plans
Vesting period (in years)	3 years
Requisite continuous employment period (in years)	3 years

The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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