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Lease Commitments - Assets and Liabilities of Lessee (Details) - USD ($) $ in Millions | Dec. 31, 2021 | Dec. 31, 2020
--- | --- | ---
Assets |  |
Operating lease assets | $ 786 | $ 911
Finance lease assets | 63 | 89
Total lease assets | $ 849 | $ 1,000
Finance Lease, Right-of-Use Asset, Statement of Financial Position [Extensible List] | Other non-current assets | Other non-current assets
Current lease liabilities |  |
Operating | $ 194 | $ 204
Finance | $ 19 | $ 30
Operating Lease, Liability, Current, Statement of Financial Position [Extensible List] | Other current liabilities | Other current liabilities
Finance Lease, Liability, Current, Statement of Financial Position [Extensible List] | Other current liabilities | Other current liabilities
Non-current lease liabilities |  |
Operating | $ 772 | $ 897
Finance | $ 46 | $ 65
Finance Lease, Liability, Noncurrent, Statement of Financial Position [Extensible List] | Other non-current liabilities | Other non-current liabilities
Total lease liabilities | $ 1,031 | $ 1,196

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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as current. + 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 (b) -URI http://asc.fasb.org/extlink&oid=123391704&loc=SL77918627-209977 + Details
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