| 2007 | 2006 |
Financial Instrument [Line Items] | Financial Instrument [Line Items] |
Financial Instrument, Carrying Value | Financial Instrument, Fair Value | Financial Instrument, Carrying Value | Financial Instrument, Fair Value |
| Dealer Remarketable Securities, 350 Million Dollars [Member] | 350,000,000 | 368,000,000 | 350,000,000 | 358,000,000 |
Convertible Notes, 252 Million Dollars [Member] | 222,000,000 | 212,000,000 | 542,000,000 | 568,000,000 |
Remaining Long-term Debt [Member] | 3,797,000,000 | 3,796,000,000 | 1,047,000,000 | 1,054,000,000 |
Financial Instrument, Description [Domain] | | | | |