|
Property, Plant And Equipment And Asset Retirement Obligations (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
12 Months Ended | ||
|---|---|---|---|
|
Dec. 31, 2011
|
Dec. 31, 2010
|
Dec. 31, 2009
|
|
| Property, Plant and Equipment [Line Items] | |||
| Accumulated depreciation and depletion | $ 179,331 | $ 174,390 | |
| Interest capitalized | $ 593 | $ 532 | $ 425 |
|
Refinery And Lubes Basestock [Member] | Downstream [Member]
|
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| Property, Plant and Equipment [Line Items] | |||
| Estimated useful life of equipment, years | 25 | ||
|
Service Station Buildings And Fixed Improvements [Member] | Downstream [Member]
|
|||
| Property, Plant and Equipment [Line Items] | |||
| Estimated useful life of equipment, years | 20 | ||
|
Chemical [Member] | Investments In Process Equipment [Member]
|
|||
| Property, Plant and Equipment [Line Items] | |||
| Estimated useful life of equipment, years | 20 | ||