|
Consolidated Balance Sheet (Parenthetical) (USD $)
|
Dec. 31, 2011
|
Dec. 31, 2010
|
|---|---|---|
| Common stock, par value | $ 1 | $ 1 |
| Common stock, shares authorized | 500,000,000 | 500,000,000 |
| Common stock, shares issued | 224,665,395 | 242,019,650 |
| Common stock, shares outstanding | 222,955,853 | 241,035,250 |