Income Taxes (Details Textual) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2017	Mar. 31, 2016	Mar. 31, 2015	Mar. 31, 2014
Income Tax Details [Line Items]
Increase in income tax provision related to tax losses	$ 67	$ 104	$ 95
Impact on income tax provision of the credits	14	22	22
Income tax holiday, amount	3
Deferred tax assets, valuation allowance	(680)	(613)
Net operating loss carryforwards	614
Tax credit carryforward	110	103
Operating loss carryforwards, valuation allowance	531	468
Tax credit carryforward, valuation allowance	90	88
Operating loss carryforwards		638
Undistributed earnings of foreign subsidiaries (outside Canada)	2,700
Unrecognized tax benefits	36	34	37	$ 39
Maximum amount by which reserves for interest and penalties for unrecognized tax benefits may decrease in the next 12 months	16
Accrued income tax penalties and interest	5	4	5
Income tax penalties and interest expense	1	2
Settlement with taxing authorities including interest			$ 1
Taxes payable	46	42
Taxes payable, current	28	$ 13
New York [Member]
Income Tax Details [Line Items]
Income tax credits and adjustments	4
United Kingdom [Member]
Income Tax Details [Line Items]
Income tax credits and adjustments	7
Canada [Member]
Income Tax Details [Line Items]
Deferred tax assets, valuation allowance	(601)
Tax credit carryforward	46
Operating loss carryforwards	$ 496