|
Disclosure Of Fair Value Of Financial Instruments (Details) (USD $)
In Billions, unless otherwise specified |
Sep. 30, 2012
|
Dec. 31, 2011
|
|---|---|---|
| Disclosure Of Fair Value Of Financial Instruments [Abstract] | ||
| Fair value of Company's long-term debt | $ 2.2 | $ 2.1 |
| Book value of Company's long-term debt | $ 2.0 | $ 1.9 |