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Derivative Financial Instruments - Outstanding Foreign Currency Forward Contracts (Detail) - Forward Contracts [Member]
€ in Millions, £ in Millions, SGD in Millions, SEK in Millions, RUB in Millions, NOK in Millions, MXN in Millions, DKK in Millions, CAD in Millions, BRL in Millions, $ in Millions
Jun. 30, 2015
USD ($)
Jun. 30, 2015
RUB
Jun. 30, 2015
SEK
Jun. 30, 2015
SGD
Jun. 30, 2015
CAD
Jun. 30, 2015
DKK
Jun. 30, 2015
EUR (€)
Jun. 30, 2015
GBP (£)
Jun. 30, 2015
NOK
Dec. 31, 2014
USD ($)
Dec. 31, 2014
SEK
Dec. 31, 2014
SGD
Dec. 31, 2014
CAD
Dec. 31, 2014
DKK
Dec. 31, 2014
EUR (€)
Dec. 31, 2014
GBP (£)
Dec. 31, 2014
NOK
Dec. 31, 2014
BRL
Dec. 31, 2014
MXN
Derivative [Line Items]                                      
Foreign currency, Cash flow hedging $ 177     SGD 24 CAD 8 DKK 105 € 242 £ 37 NOK 11,732 $ 231   SGD 44 CAD 14 DKK 227 € 462 £ 80 NOK 10,781    
Foreign currency, Non-designated hedging $ 1,440 RUB 1,695 SEK 1 SGD 2 CAD 7 DKK 218 € 434 £ 13 NOK 3,015 $ 1,092 SEK 3 SGD 4 CAD 4 DKK 322 € 401 £ 19 NOK 4,052 BRL 57 MXN 118