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Derivatives and Risk Management Activities (Details 3)
In Millions, unless otherwise specified
Mar. 31, 2013
USD ($)
Mar. 31, 2013
Foreign exchange contracts
USD ($)
Mar. 31, 2013
Foreign exchange contracts
CAD
Mar. 31, 2013
Foreign exchange forward contract that exchange CAD for USD at the rate USD 1.00 to CAD 1.00 maturing in 2013
USD ($)
Mar. 31, 2013
Foreign exchange forward contract that exchange CAD for USD at the rate USD 1.00 to CAD 1.00 maturing in 2013
CAD
Mar. 31, 2013
Foreign exchange forward contract that exchange USD for CAD at the rate USD 0.99 to CAD 1.00 maturing in 2013
USD ($)
Mar. 31, 2013
Foreign exchange forward contract that exchange USD for CAD at the rate USD 0.99 to CAD 1.00 maturing in 2013
CAD
Mar. 31, 2013
Foreign exchange forward contract that exchange USD for CAD at the rate USD 1.00 to CAD 1.00 maturing in 2014
USD ($)
Mar. 31, 2013
Foreign exchange forward contract that exchange USD for CAD at the rate USD 1.00 to CAD 1.00 maturing in 2014
CAD
Mar. 31, 2013
Foreign exchange forward contract that exchange USD for CAD at the rate USD 0.99 to CAD 1.00
USD ($)
Mar. 31, 2013
Foreign exchange forward contract that exchange USD for CAD at the rate USD 0.99 to CAD 1.00
CAD
Mar. 31, 2013
Foreign exchange forward contract maturing in 2013
USD ($)
Mar. 31, 2013
Foreign exchange forward contract maturing in 2013
CAD
Mar. 31, 2013
Foreign exchange forward contract maturing in 2014
USD ($)
Mar. 31, 2013
Foreign exchange forward contract maturing in 2014
CAD
Currency Exchange Rate Risk Hedging:                              
Net deferred gains from currency risk rate hedging included in AOCI $ 4                            
Notional amount of outstanding foreign currency forward exchange contracts   $ 145 146 $ 7 7 $ 151 152 $ 1 1 $ 152 153 $ 144 145 $ 1 1
Average exchange rate for outstanding foreign currency forward exchange contracts       1.00 1.00 0.99 0.99 1.00 1.00 0.99 0.99