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Financial Instruments, Derivatives and Hedging Activities (Details) (USD $)
In Millions, unless otherwise specified
6 Months Ended 6 Months Ended
Jun. 30, 2014
Dec. 31, 2013
Jun. 30, 2013
Dec. 31, 2012
Jun. 30, 2014
Commodity Contract [Member]
Minimum [Member]
Jun. 30, 2014
Commodity Contract [Member]
Maximum [Member]
Jun. 30, 2014
Cash Flow Hedging [Member]
Commodity Contract [Member]
Dec. 31, 2013
Cash Flow Hedging [Member]
Commodity Contract [Member]
Jun. 30, 2014
Cash Flow Hedging [Member]
Treasury Lock [Member]
Dec. 31, 2013
Cash Flow Hedging [Member]
Treasury Lock [Member]
Jun. 30, 2014
Fair Value Hedging [Member]
Interest Rate Swap [Member]
Jun. 30, 2014
Fair Value Hedging [Member]
Interest Rate Swap [Member]
Senior Notes 3.20 Percent Due November 1, 2015 [Member]
Dec. 31, 2013
Fair Value Hedging [Member]
Interest Rate Swap [Member]
Senior Notes 3.20 Percent Due November 1, 2015 [Member]
Jun. 30, 2014
Fair Value Hedging [Member]
Foreign Exchange Forward [Member]
Dec. 31, 2013
Fair Value Hedging [Member]
Foreign Exchange Forward [Member]
Jun. 30, 2014
Fair Value Hedging [Member]
Foreign Exchange Forward [Member]
Short [Member]
Dec. 31, 2013
Fair Value Hedging [Member]
Foreign Exchange Forward [Member]
Short [Member]
Jun. 30, 2014
Fair Value Hedging [Member]
Foreign Exchange Forward [Member]
Long [Member]
Dec. 31, 2013
Fair Value Hedging [Member]
Foreign Exchange Forward [Member]
Long [Member]
Financial instruments, derivatives and hedging activities                                      
Maturity period of price risk derivative         12 months 18 months                          
Accumulated gains (losses) from derivative instruments, net of tax effect $ (562.0) $ (583.0) $ (615.0) $ (475.0)     $ (18.0) $ (32.0) $ (8.0) $ (8.0)       $ (0.3) $ 1.0        
Accumulated gains (losses) from derivative instruments, income tax effect             (8) (15)                      
Debt, fixed interest rate (as a percent)                       3.20%              
Debt, face amount                       350              
Debt, fixed interest rate (as a percent)                       3.20%              
Fair value of interest rate derivatives                 0 0   11 13            
Debt, floating rate of interest basis                     six-month US dollar LIBOR rate plus a spread                
Losses on cash flow hedges, income tax effect                 (4) (5)                  
Fair value of foreign currency forward contract liabilities                           0.3 5.0        
Foreign currency hedging                                      
Derivative notional amount                               $ 116 $ 147 $ 59 $ 78