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Commitments And Contingencies (Schedule Of Commitments And Contingencies) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended |
|---|---|
|
Dec. 31, 2011
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|
Purchase Obligations [Member]
|
|
| Purchase Commitment, Excluding Long-term Commitment [Line Items] | |
| 2012 | $ 900 |
| 2013 | 905 |
| 2014 | 905 |
| 2015 | 905 |
| 2016 | 924 |
| Thereafter | 3,915 |
| Total | 8,454 |
|
Drilling And Facility Obligations [Member]
|
|
| Purchase Commitment, Excluding Long-term Commitment [Line Items] | |
| 2012 | 919 |
| 2013 | 456 |
| 2014 | 100 |
| Total | 1,475 |
|
Firm Transportation Agreements [Member]
|
|
| Purchase Commitment, Excluding Long-term Commitment [Line Items] | |
| 2012 | 306 |
| 2013 | 302 |
| 2014 | 283 |
| 2015 | 250 |
| 2016 | 209 |
| Thereafter | 786 |
| Total | 2,136 |
|
Office And Equipment Leases [Member]
|
|
| Purchase Commitment, Excluding Long-term Commitment [Line Items] | |
| 2012 | 63 |
| 2013 | 56 |
| 2014 | 47 |
| 2015 | 44 |
| 2016 | 43 |
| Thereafter | 220 |
| Total | $ 473 |