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Derivatives and Risk Management Activities (Details 3)
In Millions, unless otherwise specified
Jun. 30, 2013
USD ($)
Jun. 30, 2013
Foreign exchange contracts
USD ($)
Jun. 30, 2013
Foreign exchange contracts
CAD
Jun. 30, 2013
Foreign exchange forward contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.05 maturing in 2013
USD ($)
Jun. 30, 2013
Foreign exchange forward contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.05 maturing in 2013
CAD
Jun. 30, 2013
Foreign exchange forward contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.06 maturing in 2014
USD ($)
Jun. 30, 2013
Foreign exchange forward contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.06 maturing in 2014
CAD
Jun. 30, 2013
Foreign exchange forward contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.07 maturing in 2015
USD ($)
Jun. 30, 2013
Foreign exchange forward contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.07 maturing in 2015
CAD
Jun. 30, 2013
Foreign exchange forward contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.05
USD ($)
Jun. 30, 2013
Foreign exchange forward contracts that exchange CAD for USD at the rate USD 1.00 to CAD 1.05
CAD
Jun. 30, 2013
Foreign exchange forward contract that exchange USD for CAD at the rate USD 1.00 to CAD 1.03 maturing in 2013
USD ($)
Jun. 30, 2013
Foreign exchange forward contract that exchange USD for CAD at the rate USD 1.00 to CAD 1.03 maturing in 2013
CAD
Jun. 30, 2013
Foreign exchange forward contract that exchange USD for CAD at the rate USD 1.00 to CAD 1.03 maturing in 2014
USD ($)
Jun. 30, 2013
Foreign exchange forward contract that exchange USD for CAD at the rate USD 1.00 to CAD 1.03 maturing in 2014
CAD
Jun. 30, 2013
Foreign exchange forward contract that exchange USD for CAD at the rate USD 1.00 to CAD 1.06 maturing in 2015
USD ($)
Jun. 30, 2013
Foreign exchange forward contract that exchange USD for CAD at the rate USD 1.00 to CAD 1.06 maturing in 2015
CAD
Jun. 30, 2013
Foreign exchange forward contract that exchange USD for CAD at the rate USD 1.00 to CAD 1.03
USD ($)
Jun. 30, 2013
Foreign exchange forward contract that exchange USD for CAD at the rate USD 1.00 to CAD 1.03
CAD
Jun. 30, 2013
Foreign exchange forward contracts maturing in 2013
USD ($)
Jun. 30, 2013
Foreign exchange forward contracts maturing in 2013
CAD
Jun. 30, 2013
Foreign exchange forward contracts maturing in 2014
CAD
Currency Exchange Rate Risk Hedging:                                            
Net deferred gains from currency risk rate hedging included in AOCI $ 3                                          
Notional amount of outstanding foreign currency forward exchange contracts   $ 5 9 $ 214 224 $ 42 44 $ 9 9 $ 265 277 $ 209 216 $ 42 43 $ 9 9 $ 260 268 $ 5 8 1
Average exchange rate for outstanding foreign currency forward exchange contracts       1.05 1.05 1.06 1.06 1.07 1.07 1.05 1.05 1.03 1.03 1.03 1.03 1.06 1.06 1.03 1.03