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Leases - Supplemental balance sheet information (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020 | Mar. 31, 2020
--- | --- | --- | ---
Operating leases: |  |  |
Operating lease right of use assets | $ 858 | $ 864 |
Current operating lease liabilities | 263 | 256 |
Noncurrent operating lease liabilities | 591 | 609 |
Total operating lease liabilities | 854 | 865 |
Finance leases: |  |  |
Property and equipment, at cost | 223 | 225 |
Accumulated amortization | (117) | (106) |
Property and equipment, net | $ 106 | $ 119 | $ 10
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible Enumeration] | Property and equipment, net | Property and equipment, net |
Current obligations of finance leases | $ 7 | $ 22 |
Finance Lease, Liability, Current, Statement of Financial Position [Extensible Enumeration] | Other current liabilities | Other current liabilities |
Finance leases, net of current obligations | $ 93 | $ 93 |
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible Enumeration] | Other liabilities | Other liabilities |
Total finance lease liabilities | $ 100 | $ 115 |
Weighted average remaining lease term (in years): |  |  |
Operating leases weighted average remaining lease term (in years) | 5 years 6 months | 5 years 7 months 6 days |
Finance leases weighted average remaining lease term (in years) | 6 years 7 months 6 days | 7 years 7 months 6 days |
Weighted average discount rate: |  |  |
Operating leases weighted average discount rate (as a percent) | 1.80% | 2.40% |
Finance leases weighted average discount rate (as a percent) | 3.30% | 3.50% |

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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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