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Income Taxes (Income Tax Provision) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended								12 Months Ended
	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2015	Mar. 31, 2014	Mar. 31, 2013
Current provision (benefit):
Domestic (Canada)									$ 4us-gaap_CurrentFederalTaxExpenseBenefit	$ 12us-gaap_CurrentFederalTaxExpenseBenefit	$ 11us-gaap_CurrentFederalTaxExpenseBenefit
Foreign (all other countries)									98us-gaap_CurrentForeignTaxExpenseBenefit	128us-gaap_CurrentForeignTaxExpenseBenefit	103us-gaap_CurrentForeignTaxExpenseBenefit
Total current									102us-gaap_CurrentIncomeTaxExpenseBenefit	140us-gaap_CurrentIncomeTaxExpenseBenefit	114us-gaap_CurrentIncomeTaxExpenseBenefit
Deferred provision (benefit):
Domestic (Canada)									0	0	0
Foreign (all other countries)									(88)	(129)	(31)
Total deferred									(88)us-gaap_DeferredIncomeTaxExpenseBenefit	(129)us-gaap_DeferredIncomeTaxExpenseBenefit	(31)us-gaap_DeferredIncomeTaxExpenseBenefit
Income tax provision (benefit)	$ (11)us-gaap_IncomeTaxExpenseBenefit	$ 3us-gaap_IncomeTaxExpenseBenefit	$ (2)us-gaap_IncomeTaxExpenseBenefit	$ 24us-gaap_IncomeTaxExpenseBenefit	$ (15)us-gaap_IncomeTaxExpenseBenefit	$ (3)us-gaap_IncomeTaxExpenseBenefit	$ 26us-gaap_IncomeTaxExpenseBenefit	$ 3us-gaap_IncomeTaxExpenseBenefit	$ 14us-gaap_IncomeTaxExpenseBenefit	$ 11us-gaap_IncomeTaxExpenseBenefit	$ 83us-gaap_IncomeTaxExpenseBenefit

Amount of current federal tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of current income tax expense (benefit) pertaining to taxable income (loss) from continuing operations.

Amount of deferred federal income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred foreign income tax expense (benefit) pertaining to income (loss) from continuing operations.

Amount of deferred income tax expense (benefit) pertaining to income (loss) from continuing operations.