Debt and Financing Activities	9 Months Ended
Dec. 31, 2018
Debt Disclosure [Abstract]
Debt and Financing Activities	Debt and Financing Activities Long-Term Debt Our long-term debt includes both U.S. dollar and foreign currency denominated borrowings. At December 31, 2018 and March 31, 2018, $8,736 million and $7,880 million of total debt were outstanding, of which $1,120 million and $1,129 million were included under the caption “Current portion of long-term debt” within our condensed consolidated balance sheets. During the first nine months of 2018, we repaid a €500 million bond that matured on April 26, 2017. Fiscal 2019 Debt Issuances On November 30, 2018, we completed a public offering of 3.65% Notes due November 30, 2020 (the “2020 Notes”) in a principal amount of $700 million and 4.75% Notes due May 30, 2029 (the “2029 Notes”) in a principal amount of $400 million. Interest on the 2020 Notes and 2029 Notes is payable semi-annually on May 30^th and November 30^th of each year, commencing on May 30, 2019. We utilized the net proceeds from these notes of $1.1 billion, net of discounts and offering expenses, for general corporate purposes. Each note, which constitutes a “Series”, is an unsecured and unsubordinated obligation of the Company and ranks equally with all of the Company’s existing and, from time-to-time, future unsecured and unsubordinated indebtedness outstanding. Each Series is governed by materially similar indentures and officers’ certificates. Upon required notice to holders of notes with fixed interest rates, we may redeem those notes at any time prior to maturity, in whole or in part, for cash at redemption prices. In the event of the occurrence of both (1) a change of control of the Company and (2) a downgrade of a Series below an investment grade rating by each of Fitch Inc., Moody’s Investors Service, Inc. and Standard & Poor’s Ratings Services within a specified period, an offer must be made to purchase that Series from the holders at a price equal to 101% of the then outstanding principal amount of that Series, plus accrued and unpaid interest to, but not including, the date of repurchase. The indenture and the related officers’ certificate for each Series, subject to the exceptions and in compliance with the conditions as applicable, specify that we may not consolidate, merge or sell all or substantially all of our assets, incur liens, or enter into sale-leaseback transactions exceeding specific terms, without lenders’ consent. The indentures also contain customary events of default provisions. Revolving Credit Facilities We have a syndicated $3.5 billion five-year senior unsecured revolving credit facility (the “Global Facility”), which has a $3.15 billion aggregate sublimit of availability in Canadian dollars, British pound sterling and Euros. The Global Facility matures on October 22, 2020. Borrowings under the Global Facility bear interest based upon the London Interbank Offered Rate, Canadian Dealer Offered Rate for credit extensions denominated in Canadian Dollars, a prime rate, or alternative overnight rates as applicable, plus agreed margins. The Global Facility contains a financial covenant which obligates the Company to maintain a debt to capital ratio of no greater than 65% and other customary investment grade covenants. If we do not comply with these covenants, our ability to use the Global Facility may be suspended and repayment of any outstanding balances under the Global Facility may be required. At December 31, 2018, we were in compliance with all covenants. There were no borrowings under this facility during the third quarters and first nine months of 2019 and 2018, and no borrowings outstanding as of December 31, 2018 and March 31, 2018. We also maintain bilateral credit lines primarily denominated in Euros with a committed balance of $9 million and an uncommitted balance of $198 million as of December 31, 2018. Borrowings and repayments were not material during the first nine months of 2019 and 2018 and amounts outstanding under these credit lines were not material as of December 31, 2018 and March 31, 2018. Commercial Paper We maintain a commercial paper program to support our working capital requirements and for other general corporate purposes. Under the program, the Company can issue up to $3.5 billion in outstanding notes. During the first nine months of 2019 and 2018, we borrowed $30.4 billion and $12.7 billion and repaid $29.3 billion and $12.1 billion under the program. At December 31, 2018, there were $1.1 billion of commercial paper notes outstanding with a weighted average interest rate of 3.20%. At March 31, 2018, there were no commercial paper notes outstanding.

Debt and Financing Activities

Long-Term Debt

Our long-term debt includes both U.S. dollar and foreign currency denominated borrowings. At December 31, 2018 and March 31, 2018, $8,736 million and $7,880 million of total debt were outstanding, of which $1,120 million and $1,129 million were included under the caption “Current portion of long-term debt” within our condensed consolidated balance sheets.

During the first nine months of 2018, we repaid a €500 million bond that matured on April 26, 2017.

Fiscal 2019 Debt Issuances

On November 30, 2018, we completed a public offering of 3.65% Notes due November 30, 2020 (the “2020 Notes”) in a principal amount of $700 million and 4.75% Notes due May 30, 2029 (the “2029 Notes”) in a principal amount of $400 million. Interest on the 2020 Notes and 2029 Notes is payable semi-annually on May 30^th and November 30^th of each year, commencing on May 30, 2019. We utilized the net proceeds from these notes of $1.1 billion, net of discounts and offering expenses, for general corporate purposes.

Each note, which constitutes a “Series”, is an unsecured and unsubordinated obligation of the Company and ranks equally with all of the Company’s existing and, from time-to-time, future unsecured and unsubordinated indebtedness outstanding. Each Series is governed by materially similar indentures and officers’ certificates. Upon required notice to holders of notes with fixed interest rates, we may redeem those notes at any time prior to maturity, in whole or in part, for cash at redemption prices. In the event of the occurrence of both (1) a change of control of the Company and (2) a downgrade of a Series below an investment grade rating by each of Fitch Inc., Moody’s Investors Service, Inc. and Standard & Poor’s Ratings Services within a specified period, an offer must be made to purchase that Series from the holders at a price equal to 101% of the then outstanding principal amount of that Series, plus accrued and unpaid interest to, but not including, the date of repurchase. The indenture and the related officers’ certificate for each Series, subject to the exceptions and in compliance with the conditions as applicable, specify that we may not consolidate, merge or sell all or substantially all of our assets, incur liens, or enter into sale-leaseback transactions exceeding specific terms, without lenders’ consent. The indentures also contain customary events of default provisions.

Revolving Credit Facilities

We have a syndicated $3.5 billion five-year senior unsecured revolving credit facility (the “Global Facility”), which has a $3.15 billion aggregate sublimit of availability in Canadian dollars, British pound sterling and Euros. The Global Facility matures on October 22, 2020. Borrowings under the Global Facility bear interest based upon the London Interbank Offered Rate, Canadian Dealer Offered Rate for credit extensions denominated in Canadian Dollars, a prime rate, or alternative overnight rates as applicable, plus agreed margins. The Global Facility contains a financial covenant which obligates the Company to maintain a debt to capital ratio of no greater than 65% and other customary investment grade covenants. If we do not comply with these covenants, our ability to use the Global Facility may be suspended and repayment of any outstanding balances under the Global Facility may be required. At December 31, 2018, we were in compliance with all covenants. There were no borrowings under this facility during the third quarters and first nine months of 2019 and 2018, and no borrowings outstanding as of December 31, 2018 and March 31, 2018.

We also maintain bilateral credit lines primarily denominated in Euros with a committed balance of $9 million and an uncommitted balance of $198 million as of December 31, 2018. Borrowings and repayments were not material during the first nine months of 2019 and 2018 and amounts outstanding under these credit lines were not material as of December 31, 2018 and March 31, 2018.

Commercial Paper

We maintain a commercial paper program to support our working capital requirements and for other general corporate purposes. Under the program, the Company can issue up to $3.5 billion in outstanding notes. During the first nine months of 2019 and 2018, we borrowed $30.4 billion and $12.7 billion and repaid $29.3 billion and $12.1 billion under the program. At December 31, 2018, there were $1.1 billion of commercial paper notes outstanding with a weighted average interest rate of 3.20%. At March 31, 2018, there were no commercial paper notes outstanding.