Interest expense related to debt borrowings during the period.

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Line of Credit Facility, Amount Pledged in Support of Bank Guarantees and Other Local Credit Lines

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Maximum incremental credit increases relating to the Revolving Credit Facility available and subject to certain conditions and the agreement of its lenders.

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Financial covenant relating to the revolving credit facility. As of any date, for the period of four fiscal quarters ended on or immediately prior to such 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 revolving credit facility agreement, must not be less than 3.50 to 1.00.

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Financial covenant relating to the revolving credit facility. As of any date, for the period of four fiscal quarters ended on or immediately prior to such date, 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.

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Basis points to be added to the rate specified in the debt agreement, used to calculate the redemption amount of the related debt instrument.

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Long term debt change in control repurchase percentage.

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The amount of debt discount that was originally recognized at the issuance of the instrument that has yet to be amortized.

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States whether the entity was in compliance with the debt covenants throughout the reporting period, and describes facts and circumstances of any compliance failure.

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Description of minimum financial levels (for example, tangible net worth and working capital) and achievement of certain financial ratios (for example, working capital ratio and debt service coverage ratio), and adherence to certain clauses which generally require or restrict certain actions (for example, entering into a debt arrangement with equal or greater seniority, and selling or discontinuing a certain business segment or material subsidiary) to be in compliance with the covenant clauses of the debt agreement. May also include a discussion of the adverse consequences that would result if the entity violates or fails to satisfy the covenants.

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Face (par) amount of debt instrument at time of issuance.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
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-Section 55
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Contractual interest rate for funds borrowed, under the debt agreement.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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No definition available.

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Date when the debt instrument is scheduled to be fully repaid, in CCYY-MM-DD format.

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- Definition

Percentage price of original principal amount of debt at which debt can be redeemed by the issuer.

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Amount, after accumulated amortization, of debt discount.

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Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs.

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Amount of the cost of borrowed funds accounted for as interest expense.

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Amount of the cost of borrowed funds accounted for as interest expense for debt.

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- Definition

The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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The effective interest rate at the end of the reporting period.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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- Definition

The cash inflow from a debt initially having maturity due after one year or beyond the operating cycle, if longer.

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- Definition

Amount of cash inflow from contractual arrangement with the lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Amount of cash outflow for payment of an obligation from a lender, including but not limited to, letter of credit, standby letter of credit and revolving credit arrangements.

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Debt 5 (Details) - USD ($) $ in Millions	1 Months Ended							12 Months Ended
Debt 5 (Details) - USD ($) $ in Millions	Apr. 30, 2018	Jun. 30, 2017	Mar. 31, 2017	Aug. 31, 2015	Jul. 31, 2015	Aug. 31, 2013	Nov. 30, 2009	Mar. 31, 2018	Mar. 31, 2017	Mar. 31, 2016	Apr. 20, 2018	Mar. 17, 2017	Oct. 20, 2015	Aug. 04, 2015	Jul. 08, 2015	Aug. 16, 2013	Nov. 13, 2009
Debt Disclosure [Abstract]
Interest expense								$ 127	$ 90	$ 81
Debt Instruments
Proceeds from issuance of debt								0	850	$ 1,100
Debt instrument, Discount			$ 3					1	3
Revolving Credit Facility
Debt Instruments
Debt instrument, Maturity date		Jun. 27, 2022
Maximum borrowing capacity								1,000
Maximum available credit increase								500
Borrowing activity under revolving credit facility								0	0
Proceeds from borrowing under revolving credit facility					$ 400
Debt instrument, Interest rate															1.19%
Repayment of borrowing under revolving credit facility				$ 400
Interest expense related to borrowing under revolving credit facility										less than $1 million
Outstanding borrowings			$ 0					$ 0	0
Revolving credit facility, Covenant description								The revolving credit facility contains customary covenants for borrowings of this type, including two financial covenants: (i) as of any date, for the period of four fiscal quarters ended on or immediately prior to such date, 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) as of any date, for the period of four fiscal quarters ended on or immediately prior to such 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 for borrowed money to consolidated cash flow								400.00%
Revolving credit facility, Financial covenant, Ratio of consolidated cash flow to the sum of interest payable and amortization of debt discount on all consolidated debt for borrowed money								350.00%
Revolving credit facility, Covenant compliance								At March 31, 2018, the Company was in compliance with all covenants.
Base Rate Borrowings
Debt Instruments
Interest rate that would have applied at year end under revolving credit facility								4.88%
Eurocurrency Rate Borrowings
Debt Instruments
Interest rate that would have applied at year end under revolving credit facility								2.88%
2.875% Senior Notes due August 2018
Debt Instruments
Debt instrument, Maturity date						Aug. 15, 2018
Debt instrument, Interest rate																2.875%
Debt instrument, Face amount																$ 250
Proceeds from issuance of debt						$ 249
Debt instrument, Discount																$ 1
Additional basis points (make-whole premium) for redemption of Senior Notes																0.25%
Change of control repurchase percentage for Senior Notes																101.00%
5.375% Senior Notes due December 2019
Debt Instruments
Debt instrument, Maturity date							Dec. 01, 2019
Debt instrument, Interest rate																	5.375%
Debt instrument, Face amount																	$ 750
Additional basis points (make-whole premium) for redemption of Senior Notes																	0.30%
Change of control repurchase percentage for Senior Notes																	101.00%
3.600% Senior Notes due August 2020
Debt Instruments
Debt instrument, Maturity date				Aug. 01, 2020
Debt instrument, Interest rate														3.60%
Debt instrument, Face amount														$ 400
Proceeds from issuance of debt				$ 400
Debt instrument, Discount				less than $1 million
Additional basis points (make-whole premium) for redemption of Senior Notes														0.30%
Change of control repurchase percentage for Senior Notes														101.00%
Debt issuance costs incurred														$ 3
3.600% Senior Notes due August 2022
Debt Instruments
Debt instrument, Maturity date			Aug. 15, 2022
Debt instrument, Interest rate												3.60%
Debt instrument, Face amount												$ 500
Proceeds from issuance of debt			$ 500
Debt instrument, Discount			less than $1 million
Additional basis points (make-whole premium) for redemption of Senior Notes												0.25%
Change of control repurchase percentage for Senior Notes												101.00%
Debt issuance costs incurred												$ 4
4.500% Senior Notes due August 2023
Debt Instruments
Debt instrument, Maturity date						Aug. 15, 2023
Debt instrument, Interest rate																4.50%
Debt instrument, Face amount																$ 250
Proceeds from issuance of debt						$ 249
Debt instrument, Discount																$ 1
Additional basis points (make-whole premium) for redemption of Senior Notes																0.30%
Change of control repurchase percentage for Senior Notes																101.00%
4.700% Senior Notes due March 2027
Debt Instruments
Debt instrument, Maturity date			Mar. 15, 2027
Debt instrument, Interest rate												4.70%
Debt instrument, Face amount												$ 350
Proceeds from issuance of debt			$ 350
Additional basis points (make-whole premium) for redemption of Senior Notes												0.35%
Change of control repurchase percentage for Senior Notes												101.00%
Debt issuance costs incurred												$ 3
Term Loan due April 2023
Debt Instruments
Debt instrument, Face amount													$ 300
Term Loan due April 2023 \| Subsequent Event
Debt Instruments
Debt instrument, Maturity date	Apr. 20, 2023
Term Loan due April 2023 \| Subsequent Event \| Base Rate
Debt Instruments
Debt instrument, Interest rate											0.125%
Term Loan due April 2023 \| Subsequent Event \| Base Rate \| Minimum
Debt Instruments
Debt instrument, Interest rate											0.00%
Term Loan due April 2023 \| Subsequent Event \| Base Rate \| Maximum
Debt Instruments
Debt instrument, Interest rate											0.50%
Term Loan due April 2023 \| Subsequent Event \| Eurodollar Rate
Debt Instruments
Debt instrument, Interest rate											1.125%
Term Loan due April 2023 \| Subsequent Event \| Eurodollar Rate \| Minimum
Debt Instruments
Debt instrument, Interest rate											0.875%
Term Loan due April 2023 \| Subsequent Event \| Eurodollar Rate \| Maximum
Debt Instruments
Debt instrument, Interest rate											1.50%
Term Loan due April 2023 \| Subsequent Event \| April 1, 2017 through January 1, 2021
Debt Instruments
Debt instrument, Principal amortization payments, Percentage	1.25%
Term Loan due April 2023 \| Subsequent Event \| April 1, 2021 through January 1, 2022
Debt Instruments
Debt instrument, Principal amortization payments, Percentage	2.50%
Multi-Currency Lines of Credit
Debt Instruments
Maximum borrowing capacity			114					$ 114	114
Outstanding borrowings			$ 0					0	0
Amount pledged in support of bank guarantees and other local credit lines								$ 60	$ 51