| Share-based Compensation Arrangements by Share-based Payment Award, Award Type and Plan Name [Domain] |
General Employees' Stock Purchase Plan |
Share-based Compensation Arrangement by Share-based Payment Award, Grant Date [Domain] |
Share-based Compensation Arrangements by Share-based Payment Award, Grant Type [Domain] |
2007 | 2006 | 2005 |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] | | | |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period | 1,507,335 | 1,656,554 | 1,646,521 |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Weighted Average Exercise Price | 69.34 | 65.25 | 66.11 |
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period | (1,507,335) | (1,656,554) | (1,646,521) |
| Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period, Weighted Average Exercise Price | 69.34 | 65.25 | 66.11 |
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant | 8,940,650 | 10,447,985 | 12,104,539 |
Share-based Compensation Arrangement by Share-based Payment Award, Compensation Cost | 18,000,000 | 19,000,000 | 19,000,000 |
Share-based Compensation Arrangement by Share-based Payment Award, Maximum Number of Shares Approved | 30,000,000 | | |