Debt 5 (Details) (USD $)	12 Months Ended			1 Months Ended		12 Months Ended					1 Months Ended		1 Months Ended			12 Months Ended
	Mar. 31, 2014	Mar. 31, 2013	Mar. 31, 2012	Jun. 30, 2013 Revolving Credit Facility [Member]	Apr. 30, 2011 Revolving Credit Facility [Member]	Mar. 31, 2014 Revolving Credit Facility [Member]	Mar. 31, 2012 Revolving Credit Facility [Member]	Mar. 31, 2013 Revolving Credit Facility [Member]	Mar. 31, 2014 Base Rate Borrowings [Member]	Mar. 31, 2014 Eurocurrency Rate Borrowings [Member]	Aug. 31, 2013 2.875% Senior Notes due August 2018 (2.875% Notes) [Member]	Mar. 31, 2014 2.875% Senior Notes due August 2018 (2.875% Notes) [Member]	Aug. 31, 2013 4.500% Senior Notes due August 2023 (4.500% Notes) [Member]	Mar. 31, 2014 4.500% Senior Notes due August 2023 (4.500% Notes) [Member]	Mar. 31, 2014 5.375% Senior Notes due December 2019 (5.375% Notes) [Member]	Mar. 31, 2014 6.125% Senior Notes due December 2014 (6.125% Notes) [Member]	Mar. 31, 2013 6.125% Senior Notes due December 2014 (6.125% Notes) [Member]	Mar. 31, 2014 Multi-Currency Line of Credit [Member]	Mar. 31, 2013 Multi-Currency Line of Credit [Member]
Debt Disclosure [Abstract]
Interest expense	$ 75,000,000	$ 64,000,000	$ 64,000,000
Debt Instrument [Line Items]
Unamortized premium from fair value hedge																8,000,000	19,000,000
Repayment of outstanding balance on revolving credit facility due August 2012					250,000,000
Maximum committed amount available under revolving credit facility						1,000,000,000
Maximum available credit increase under revolving credit facility						500,000,000
Interest rate that would have applied at year end under revolving credit facility									3.38%	1.15%
Debt issuance costs	5,000,000	0	2,000,000	1,000,000							2,000,000		2,000,000
Borrowings outstanding						0		0											0
Interest expense related to borrowings under revolving credit facility							less than $1 million
Revolving credit facility covenants						The revolving credit facility contains customary covenants for borrowings of this type, including two financial covenants: (i) for the 12 months ending each quarter-end, the ratio of consolidated debt for borrowed money to consolidated cash flow, each as defined in the revolving credit facility agreement, must not exceed 4.00 to 1.00; and (ii) for the 12 months ending at any date, the ratio of consolidated cash flow to the sum of interest payable on, and amortization of debt discount in respect of, all consolidated debt for borrowed money, as defined in the credit agreement, must not be less than 3.50 to 1.00.
Revolving credit facility financial covenant ratio of consolidated debt to consolidated cash flow						400.00%
Revolving credit facility financial covenant ratio of consolidated cash flow to sum of interest payable and amortization of debt discount						350.00%
Revolving credit facility covenant compliance						At March 31, 2014, the Company was in compliance with all covenants.
Senior Notes, Face amount											250,000,000		250,000,000		750,000,000	500,000,000
Senior Notes, Interest rate											2.875%		4.50%		5.375%	6.125%
Proceeds from issuance of Senior Notes	498,000,000	0	0								249,000,000		249,000,000
Senior Notes, Discount	5,000,000	5,000,000									1,000,000		1,000,000
Additional basis points for redemption of Senior Notes												0.25%		0.30%	0.30%	0.20%
Repurchase percentage of principal amount with accrued and unpaid interest												101.00%		101.00%	101.00%
Average interest rate on derivatives																2.88%
Derivative description of variable rate basis																three-month London Interbank Offered Rate (LIBOR)
Fixed interest rate on derivative																5.625%
Amount pledged in support of bank guarantees and other local credit lines																		$ 49,000,000	$ 53,000,000
Borrowings outstanding																		less than $1 million