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Subsequent Event (Narrative) (Details) (USD $)
In Millions, unless otherwise specified |
1 Months Ended |
|---|---|
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Jan. 31, 2012
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| Subsequent Event [Abstract] | |
| Corporation's ownership percentage of TonenGeneral Sekiyu K.K. | 50.00% |
| Payment for shares of ExxonMobil Yugen Kaisha (ExxonMobil wholly-own parent of TonenGeneral) | $ 3,900 |
| Shares of TonenGeneral owned by ExxonMobil Yugen Kaisha when sold | 200 |
| Corporation's ownership percentage of TonenGeneral after Tonen Geneal acquistion of ExxonMobil Yugen Kaisha | 22.00% |