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Share-Based Payments Narrative (Detail)
In Millions, unless otherwise specified |
60 Months Ended | 12 Months Ended | |||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2011
|
Apr. 23, 2009
Restated And Amended 2004 [Member]
|
Dec. 31, 2011
2004 Stock Plan [Member]
|
Dec. 31, 2011
Stock Options [Member]
Year
|
Dec. 31, 2010
Stock Options [Member]
Year
|
Dec. 31, 2009
Stock Options [Member]
Year
|
Dec. 31, 2011
Restricted Stock Units [Member]
|
Dec. 31, 2011
Total Shareholder Return Units [Member]
Year
|
Dec. 31, 2010
Total Shareholder Return Units [Member]
Year
|
Dec. 31, 2009
Total Shareholder Return Units [Member]
Year
|
Dec. 31, 2011
Total Shareholder Return Units [Member]
Minimum [Member]
Year
|
Dec. 31, 2011
Total Shareholder Return Units [Member]
Maximum [Member]
Year
|
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| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||||||||||||||||
| Increase (decrease) the number of shares available for grants | 425 | ||||||||||||||||
| Maximum shares available per individual during the plan period | 8 | 3 | |||||||||||||||
| Shares available for award | 319 | 475 | |||||||||||||||
| Vesting Period | After three years of continuous service from the grant date | After three years of continuous service from the grant date | |||||||||||||||
| Contractual term | 10 years | ||||||||||||||||
| Holding Period | 1 year | ||||||||||||||||
| Exercise period in the event of a divestiture or restructuring | 3 months | ||||||||||||||||
| Contractual term (years) | 6.25 | [1] | 6.25 | [1] | 6.00 | [1] | 5.95 | 5.00 | 5.00 | 5.00 | 7.00 | ||||||
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