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Debt and Financing Activities - Schedule of Long-Term Debt (Details) - USD ($) $ in Millions | Sep. 30, 2020 | Mar. 31, 2020
--- | --- | ---
Debt Instrument [Line Items] |  |
Lease and other obligations | $ 239 | $ 174
Total debt | 7,608 | 7,387
Less: Current portion | 1,760 | 1,052
Total long-term debt | $ 5,848 | 6,335
3.65% Notes due November 30, 2020 | Notes payable |  |
Debt Instrument [Line Items] |  |
Interest rate on debt instrument (percent) | 3.65% |
Long-term debt outstanding | $ 700 | 700
4.75% Notes due March 1, 2021 | Notes payable |  |
Debt Instrument [Line Items] |  |
Interest rate on debt instrument (percent) | 4.75% |
Long-term debt outstanding | $ 323 | 323
2.70% Notes due December 15, 2022 | Notes payable |  |
Debt Instrument [Line Items] |  |
Interest rate on debt instrument (percent) | 2.70% |
Long-term debt outstanding | $ 400 | 400
2.85% Notes due March 15, 2023 | Notes payable |  |
Debt Instrument [Line Items] |  |
Interest rate on debt instrument (percent) | 2.85% |
Long-term debt outstanding | $ 400 | 400
3.80% Notes due March 15, 2024 | Notes payable |  |
Debt Instrument [Line Items] |  |
Interest rate on debt instrument (percent) | 3.80% |
Long-term debt outstanding | $ 1,100 | 1,100
7.65% Debentures due March 1, 2027 | Notes payable |  |
Debt Instrument [Line Items] |  |
Interest rate on debt instrument (percent) | 7.65% |
Long-term debt outstanding | $ 167 | 167
3.95% Notes due February 16, 2028 | Notes payable |  |
Debt Instrument [Line Items] |  |
Interest rate on debt instrument (percent) | 3.95% |
Long-term debt outstanding | $ 600 | 600
4.75% Notes due May 30, 2029 | Notes payable |  |
Debt Instrument [Line Items] |  |
Interest rate on debt instrument (percent) | 4.75% |
Long-term debt outstanding | $ 400 | 400
6.00% Notes due March 1, 2041 | Notes payable |  |
Debt Instrument [Line Items] |  |
Interest rate on debt instrument (percent) | 6.00% |
Long-term debt outstanding | $ 282 | 282
4.88% Notes due March 15, 2044 | Notes payable |  |
Debt Instrument [Line Items] |  |
Interest rate on debt instrument (percent) | 4.88% |
Long-term debt outstanding | $ 411 | 411
0.63% Euro Notes due August 17, 2021 | Notes payable |  |
Debt Instrument [Line Items] |  |
Interest rate on debt instrument (percent) | 0.63% |
Long-term debt outstanding | $ 703 | 662
1.50% Euro Notes due November 17, 2025 | Notes payable |  |
Debt Instrument [Line Items] |  |
Interest rate on debt instrument (percent) | 1.50% |
Long-term debt outstanding | $ 700 | 659
1.63% Euro Notes due October 30, 2026 | Notes payable |  |
Debt Instrument [Line Items] |  |
Interest rate on debt instrument (percent) | 1.63% |
Long-term debt outstanding | $ 586 | 552
3.13% Sterling Notes due February 17, 2029 | Notes payable |  |
Debt Instrument [Line Items] |  |
Interest rate on debt instrument (percent) | 3.13% |
Long-term debt outstanding | $ 597 | $ 557

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