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Leases - Supplemental balance sheet information (Details) - USD ($) $ in Millions | Mar. 31, 2021 | Mar. 31, 2020 | Apr. 01, 2019
--- | --- | --- | ---
Leases [Abstract] |  |  |
Operating lease right-of-use assets | $ 2,100 | $ 1,886 | $ 2,100
Current portion of operating lease liabilities | 390 | 354 |
Long-term operating lease liabilities | 1,867 | 1,660 |
Total operating lease liabilities | 2,257 | 2,014 | $ 2,200
Property, plant and equipment, net | 237 | 180 |
Current portion of long-term debt | 22 | 15 |
Long-term debt | 206 | 151 |
Total finance lease liabilities | $ 228 | $ 166 |
Weighted average remaining lease term (Years) - Operating leases | 7 years 9 months 18 days | 7 years 8 months 12 days |
Weighted average remaining lease term (Years) - Finance leases | 10 years 1 month 6 days | 12 years 1 month 6 days |
Weighted average discount rate - Operating leases (percent) | 2.53% | 3.03% |
Weighted average discount rate - Finance leases (percent) | 2.71% | 2.86% |

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