|
Share-Based Payments - Data Related to All Stock Option Activity (Detail) (Stock Options [Member], USD $)
In Millions, except Per Share data, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2011
Year
|
Dec. 31, 2010
Year
|
Dec. 31, 2009
Year
|
|
|
Stock Options [Member]
|
|||
| Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | |||
| Weighted-average grant date fair value per stock option | $ 3.15 | $ 3.25 | $ 3.30 |
| Aggregate intrinsic value on exercise | $ 32 | $ 5 | $ 2 |
| Cash received upon exercise | 153 | 16 | 7 |
| Tax benefits realized related to exercise | 10 | 1 | 1 |
| Total compensation cost related to nonvested stock options not yet recognized, pre-tax | $ 177 | $ 178 | $ 147 |
| Weighted-average period over which stock option compensation cost is expected to be recognized (years) | 1.3 | 1.3 | 1.2 |
| X | ||||||||||
|
- Definition
Aggregate proceeds received by the entity during the annual period from exercises of stock or unit options and conversion of similar instruments granted under equity-based payment arrangements. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
As of the balance sheet date, the aggregate unrecognized cost of equity-based awards made to employees under equity-based compensation awards that have yet to vest. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, using a decimal to express in number of years. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
Disclosure of the aggregate tax benefit realized from the exercise of stock options and the conversion of similar instruments during the annual period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Details
|
| X | ||||||||||
|
- Definition
The total accumulated difference between fair values of underlying shares on dates of exercise and exercise price on options which were exercised (or share units converted) into shares during the reporting period under the plan. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|
| X | ||||||||||
|
- Definition
The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology. Reference 1: http://www.xbrl.org/2003/role/presentationRef
|