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Debt - Additional Information (Detail) (USD $)
In Millions, unless otherwise specified
9 Months Ended 6 Months Ended 9 Months Ended
Sep. 30, 2014
Jun. 30, 2014
Jun. 30, 2014
Coupon Rate of 1.3% Notes Mature in June 2017 [Member]
Jun. 30, 2014
Coupon Rate of 3.5% Notes Mature in July 2024 [Member]
Sep. 30, 2014
Unsecured Fixed-Rate Notes [Member]
Sep. 30, 2014
WilcoHess [Member]
Debt Instrument [Line Items]            
Unsecured fixed-rate notes issued   $ 600 $ 300 $ 300    
Unsecured fixed-rate notes issued, net of discount   598        
Coupon rate     1.30% 3.50%    
Debt notes maturity period     Jun. 30, 2017 Jul. 31, 2024    
Repayments of debt 553       250 74
Retirement of various lease obligations $ 212