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Subsequent Events Subsequent Events - Gulf Properties Pro Forma Financial Information (Unaudited) (Parenthetical) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Subsequent Event [Line Items]
Full cost ceiling impairments	$ 0	$ 0	$ 0
Subsequent Event | Gulf of Mexico Properties | Pro Forma
Subsequent Event [Line Items]
Full cost ceiling impairments	441.0
Subsequent Event | Gulf of Mexico Properties | Pro Forma | Noncontrolling Interest
Subsequent Event [Line Items]
Full cost ceiling impairments	80.0
Subsequent Event | Gulf of Mexico Properties | Pro Forma | Parent Company
Subsequent Event [Line Items]
Full cost ceiling impairments	$ 361.0

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- Definition

The excess of unamortized costs capitalized within a cost center, less related deferred income taxes, over the cost center ceiling limitation, which is charged to expense for oil and gas producing companies that use full cost method of accounting for investments in oil and gas producing properties.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 10

-Paragraph c

-Subparagraph 4(ii)

-Article 4

+ Details

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