Debt and Financing Activities	9 Months Ended
Dec. 31, 2017
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 (primarily Euro and British pound sterling) denominated borrowings. At December 31, 2017 and March 31, 2017, $8,045 million and $8,362 million of total long-term debt were outstanding, of which $531 million and $1,057 million were included under the caption “Current portion of long-term debt” within the condensed consolidated balance sheets. During the first nine months of 2018, we repaid a €500 million bond that matured on April 26, 2017. 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, 2017, we were in compliance with all covenants. There were no borrowings under this facility during the third quarters and first nine months of 2018 and 2017, and no borrowings outstanding as of December 31, 2017 and March 31, 2017. We also maintain bilateral credit lines primarily denominated in Euros with a total committed and uncommitted balance of $314 million. Borrowings and repayments were not material during the first nine months of 2018 and 2017. As of December 31, 2017 and March 31, 2017, amounts outstanding under these credit lines were not material. Commercial Paper We maintain a commercial paper program to support our working capital requirements and for other general corporate purposes. Under the program, we can issue up to $3.5 billion in outstanding notes. During the first nine months of 2018, we borrowed $12,699 million and repaid $12,133 million under the program. During the first nine months of 2017, there were no material commercial paper issuances. As of December 31, 2017 and March 31, 2017, we had $749 million and $183 million commercial paper notes outstanding with a weighted average interest rate of 2.07% and 1.20%.

Debt and Financing Activities

Long-Term Debt

Our long-term debt includes both U.S. dollar and foreign currency (primarily Euro and British pound sterling) denominated borrowings. At December 31, 2017 and March 31, 2017, $8,045 million and $8,362 million of total long-term debt were outstanding, of which $531 million and $1,057 million were included under the caption “Current portion of long-term debt” within the condensed consolidated balance sheets.

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

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, 2017, we were in compliance with all covenants. There were no borrowings under this facility during the third quarters and first nine months of 2018 and 2017, and no borrowings outstanding as of December 31, 2017 and March 31, 2017.

We also maintain bilateral credit lines primarily denominated in Euros with a total committed and uncommitted balance of $314 million. Borrowings and repayments were not material during the first nine months of 2018 and 2017. As of December 31, 2017 and March 31, 2017, amounts outstanding under these credit lines were not material.

Commercial Paper

We maintain a commercial paper program to support our working capital requirements and for other general corporate purposes. Under the program, we can issue up to $3.5 billion in outstanding notes. During the first nine months of 2018, we borrowed $12,699 million and repaid $12,133 million under the program. During the first nine months of 2017, there were no material commercial paper issuances. As of December 31, 2017 and March 31, 2017, we had $749 million and $183 million commercial paper notes outstanding with a weighted average interest rate of 2.07% and 1.20%.