|
Stock-Based Compensation (Details 4) (Stock Options [Member], USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
|---|---|---|---|---|
|
Jun. 30, 2014
|
Jun. 30, 2013
|
Jun. 30, 2014
|
Jun. 30, 2013
|
|
|
Stock Options [Member]
|
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| Stock Option Aggregate Disclosures [Abstract] | ||||
| Intrinsic value of stock options exercised | $ 124 | $ 54 | $ 158 | $ 82 |
| Cash received from option exercises | 13 | 17 | 31 | 31 |
| Treasury shares repurchased for employee payroll taxes | (6) | (7) | (13) | (12) |
| Tax benefit realized from option exercises | 47 | 21 | 60 | 32 |
| Aggregate grant-date fair value of stock options vested | $ 0 | $ 0 | $ 17 | $ 16 |