Condensed Consolidating Financial Information Related To Guaranteed Securities Issued By Subsidiaries (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 9 Months Ended |
|---|---|
Sep. 30, 2011 | |
| Condensed Consolidating Financial Information Related To Guaranteed Securities Issued By Subsidiaries | |
| Guarantee obligations current carrying value deferred interest debentures 2012 | $ 2,594 |
| Guaranteed debt securities 2011 short-term | $ 13 |
| Equity method investments ownership percentage of subsidiary | 100.00% |