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Ceiling Test Charges (Table 1) (Details) (USD $)
In Millions
3 Months Ended9 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Sep. 30, 2011
Sep. 30, 2010
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Ceiling test charges$ 152$ 14$ 152$ 16
Brazil [Member]
    
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Ceiling test charges15201520
Egypt [Member]
    
Capitalized Costs Relating to Oil and Gas Producing Activities, by Geographic Area [Line Items]    
Ceiling test charges$ 0$ 14$ 0$ 16