Debt and Financing Activities	6 Months Ended
Sep. 30, 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 September 30, 2018 and March 31, 2018, $7,694 million and $7,880 million of total debt were outstanding, of which $1,126 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 six 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 September 30, 2018, we were in compliance with all covenants. There were no borrowings under this facility during the second quarters and first six months of 2019 and 2018, and no borrowings outstanding as of September 30, 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 $200 million as of September 30, 2018. Borrowings and repayments were not material during the first six months of 2019 and 2018 and amounts outstanding under these credit lines were not material as of September 30, 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 six months of 2019 and 2018, we borrowed $19.7 billion and $8.5 billion and repaid $18.3 billion and $8.3 billion under the program. At September 30, 2018, there were $1.4 billion of commercial paper notes outstanding with a weighted average interest rate of 2.38%. 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 September 30, 2018 and March 31, 2018, $7,694 million and $7,880 million of total debt were outstanding, of which $1,126 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 six 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 September 30, 2018, we were in compliance with all covenants. There were no borrowings under this facility during the second quarters and first six months of 2019 and 2018, and no borrowings outstanding as of September 30, 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 $200 million as of September 30, 2018. Borrowings and repayments were not material during the first six months of 2019 and 2018 and amounts outstanding under these credit lines were not material as of September 30, 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 six months of 2019 and 2018, we borrowed $19.7 billion and $8.5 billion and repaid $18.3 billion and $8.3 billion under the program. At September 30, 2018, there were $1.4 billion of commercial paper notes outstanding with a weighted average interest rate of 2.38%. At March 31, 2018, there were no commercial paper notes outstanding.