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Debt and Financing Activities - Schedule Of Long-Term Debt (Details) - USD ($) $ in Millions | Mar. 31, 2020 | Mar. 31, 2019 | Mar. 31, 2018
--- | --- | --- | ---
Debt Instrument [Line Items] |  |  |
Total debt | $ 7,387 | $ 7,595 |
Less: Current portion | (1,052) | (330) |
Total long-term debt | 6,335 | 7,265 |
Notes | 3.65% Notes due November 30, 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 700 | 700 |
Debt interest rate (percent) | 3.65% |  |
Notes | 4.75% Notes due March 1, 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 323 | 323 |
Debt interest rate (percent) | 4.75% |  | 4.75%
Notes | 2.70% Notes due December 15, 2022 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 400 | 400 |
Debt interest rate (percent) | 2.70% |  |
Notes | 2.85% Notes due March 15, 2023 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 400 | 400 |
Debt interest rate (percent) | 2.85% |  |
Notes | 3.80% Notes due March 15, 2024 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 1,100 | 1,100 |
Debt interest rate (percent) | 3.80% |  |
Notes | 7.65% Debentures due March 1, 2027 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 167 | 167 |
Debt interest rate (percent) | 7.65% |  | 7.65%
Notes | 3.95% Notes due February 16, 2028 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 600 | 600 |
Debt interest rate (percent) | 3.95% |  |
Notes | 4.75% Notes due May 30, 2029 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 400 | 400 |
Debt interest rate (percent) | 4.75% |  |
Notes | 6.00% Notes due March 1, 2041 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 282 | 282 |
Debt interest rate (percent) | 6.00% |  | 6.00%
Notes | 4.88% Notes due March 15, 2044 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 411 | 411 |
Debt interest rate (percent) | 4.88% |  | 4.88%
Notes | Floating Rate Euro Notes due February 12, 2020 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 0 | 280 |
Notes | 0.63% Euro Notes due August 17, 2021 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 662 | 673 |
Debt interest rate (percent) | 0.63% |  |
Notes | 1.50% Euro Notes due November 17, 2025 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 659 | 670 |
Debt interest rate (percent) | 1.50% |  |
Notes | 1.63% Euro Notes due October 30, 2026 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 552 | 560 |
Debt interest rate (percent) | 1.63% |  |
Notes | 3.13% Sterling Notes due February 17, 2029 |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 557 | 586 |
Debt interest rate (percent) | 3.13% |  |
Lease and other obligations |  |  |
Debt Instrument [Line Items] |  |  |
Total debt | $ 174 | $ 43 |

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