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Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Sep. 30, 2021 | Mar. 31, 2021
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Operating Lease, Supplemental Balance Sheet Information [Abstract] |  |
Operating right-of-use assets, net | $ 1,174 | $ 1,366
Current operating lease liabilities | 392 | 418
Non-current operating lease liabilities | 862 | 1,038
Total operating lease liabilities | $ 1,254 | $ 1,456
Weighted-average operating lease term | 4 years 7 months 6 days | 4 years 10 months 24 days
Weighted-average operating lease discount rate | 3.50% | 3.80%
Finance Lease, Supplemental Balance Sheet Information [Abstract] |  |
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Property and equipment, net of accumulated depreciation of $4,073 and $4,121 | Property and equipment, net of accumulated depreciation of $4,073 and $4,121
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Short-term debt and current maturities of long-term debt | Short-term debt and current maturities of long-term debt
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Long-term Debt, Excluding Current Maturities | Long-term Debt, Excluding Current Maturities
ROU finance lease assets | $ 736 | $ 834
Finance lease, liability, current | 334 | 398
Finance lease, liability, noncurrent | 395 | 496
Total finance lease liabilities | $ 729 | $ 894
Weighted-average finance lease term | 2 years 7 months 6 days | 2 years 7 months 6 days
Weighted-average finance lease discount rate | 3.20% | 3.60%

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=123408670&loc=SL77918701-209980 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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- Definition Amount, after accumulated amortization, of right-of-use asset from finance lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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