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Condensed Consolidating Financial Information Related to Guaranteed Securities Issued by Subsidiaries (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
6 Months Ended |
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Jun. 30, 2011
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| Condensed Consolidating Financial Information Related to Guaranteed Securities Issued by Subsidiaries | |
| Guarantee obligations current carrying value deferred interest debentures 2012 | $ 2,525 |
| Guaranteed debt securities 2011 short-term | $ 13 |
| Equity method investments ownership percentage of subsidiary | 100.00% |