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Income Taxes - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
3 Months Ended 9 Months Ended 3 Months Ended 9 Months Ended 3 Months Ended
Sep. 30, 2014
Sep. 30, 2014
United States [Member]
Sep. 30, 2013
United States [Member]
Sep. 30, 2014
United States [Member]
Sep. 30, 2014
North Sea [Member]
Jun. 30, 2014
North Sea [Member]
Sep. 30, 2014
North Sea [Member]
Sep. 30, 2013
Kenya [Member]
Income Tax [Line Items]                
Deferred income tax liability on undistributed foreign earnings $ 814              
Deferred income tax expense on foreign earnings 249              
Income tax impact   1,500 552 1,500 17 203 220  
Assets impairment charges               $ 75