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Summary of Significant Accounting Policies - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 6 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Sep. 30, 2014
Sep. 30, 2014
North Sea [Member]
Jun. 30, 2014
North Sea [Member]
Sep. 30, 2014
North Sea [Member]
Sep. 30, 2014
United States [Member]
Sep. 30, 2013
United States [Member]
Sep. 30, 2014
United States [Member]
Nov. 07, 2014
Subsequent Event [Member]
Gulf of Mexico [Member]
Schedule Of Significant Accounting Policies [Line Items]                    
Proceeds from sale of Deepwater Gulf of Mexico assets   $ 1,400 $ 1,367              
Long-term restricted cash 471   471              
Short-term restricted cash 74   74              
Unrestricted cash                   74
Discount rate     10.00%              
Write-down of the carrying value of Oil and Gas properties       17 203 220 1,500 552 1,500  
Write-down of the carrying value of Oil and Gas properties, net of tax       7 77   996      
Deferred income tax expense on foreign earnings 249                  
Deferred income tax liability on foreign earnings, undistributed $ 814   $ 814