|
Supplemental Equity and Comprehensive Income Information (Details 1) (USD $)
|
Mar. 31, 2015
|
Dec. 31, 2014
|
|---|---|---|
| Supplemental Equity and Comprehensive Income Information | ||
| Common stock, par value per share (in dollars per share) | $ 0.01 | $ 0.01 |
| Common stock, shares issued (in shares) | 944,033,056 | 944,033,056 |
| Treasury stock (in shares) | 309,692,081 | 308,898,462 |