|
Share-Based Compensation (Narrative) (Details) (USD $)
In Millions, except Per Share data, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2012
|
Jun. 30, 2011
|
Jun. 30, 2012
|
Jun. 30, 2011
|
|
| Number of stock options granted | 21.8 | |||
| Number of restricted share units granted | 5.7 | |||
| Weighted average fair value of stock options granted | $ 7.38 | |||
| Fair value of restricted share units granted | $ 27.43 | |||
| Employee Payroll Deductions For Share Purchases Through Employee Stock Purchase Plan | $ 18 | $ 13 | $ 36 | $ 28 |
|
Stock Options [Member]
|
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| Unrecognized pretax compensation expense on nonvested awards | 385 | 385 | ||
|
Restricted Share Units [Member]
|
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| Unrecognized pretax compensation expense on nonvested awards | $ 411 | $ 411 | ||