Related Party Transactions (Purchases From Related Parties) (Detail) (USD $)
In Millions, unless otherwise specified |
3 Months Ended | 6 Months Ended | ||
---|---|---|---|---|
Jun. 30, 2012
|
Jun. 30, 2011
|
Jun. 30, 2012
|
Jun. 30, 2011
|
|
Related Party Transaction [Line Items] | ||||
Purchases from related parties | $ 57 | $ 981 | $ 120 | $ 1,766 |
Centennial [Member]
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Related Party Transaction [Line Items] | ||||
Purchases from related parties | 18 | 9 | 31 | |
LOOP [Member]
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Related Party Transaction [Line Items] | ||||
Purchases from related parties | 9 | 23 | 21 | 32 |
TAME [Member]
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Related Party Transaction [Line Items] | ||||
Purchases from related parties | 30 | 39 | 60 | 71 |
TACE [Member]
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Related Party Transaction [Line Items] | ||||
Purchases from related parties | 10 | 15 | 15 | 27 |
Other Equity Method Investees [Member]
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Related Party Transaction [Line Items] | ||||
Purchases from related parties | 8 | 9 | 15 | 15 |
Marathon Oil Companies [Member]
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Related Party Transaction [Line Items] | ||||
Purchases from related parties | $ 877 | $ 1,590 |