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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
Sep. 30, 2015
USD ($)
Sep. 30, 2015
NOK
Sep. 30, 2015
RUB
Sep. 30, 2015
SEK
Sep. 30, 2015
SGD
Sep. 30, 2015
CAD
Sep. 30, 2015
DKK
Sep. 30, 2015
EUR (€)
Sep. 30, 2015
GBP (£)
Dec. 31, 2014
USD ($)
Dec. 31, 2014
NOK
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
BRL
Dec. 31, 2014
MXN
Derivative [Line Items]                                      
Foreign currency, Cash flow hedging $ 331 NOK 11,014     SGD 15 CAD 5 DKK 85 € 139 £ 22 $ 231 NOK 10,781   SGD 44 CAD 14 DKK 227 € 462 £ 80    
Foreign currency, Non-designated hedging $ 643 NOK 2,077 RUB 2,057 SEK 1 SGD 3 CAD 15 DKK 307 € 404 £ 22 $ 1,092 NOK 4,052 SEK 3 SGD 4 CAD 4 DKK 322 € 401 £ 19 BRL 57 MXN 118