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Supplemental Cash Flow Information (Reconciliation Of Contributions From (Distributions To) Marathon Oil) (Detail) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Supplemental Cash Flow Information [Line Items]
Distributions to Marathon Oil per consolidated statements of cash flows		$ (699)
Non-cash contributions from Marathon Oil		81
Distributions to Marathon Oil per consolidated statements of stockholders' equity / net investment		$ (618)

The value of the noncash (or part noncash) consideration received in a transaction. Noncash is defined as transactions during a period that do not result in cash receipts or cash payments in the period. "Part noncash" refers to that portion of a transaction not resulting in cash receipts or cash payments in the period.

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