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Leases Lessee Disclosure - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Lessee Disclosure [Abstract] |  |  |
Operating lease assets, net |  | $ 450 | $ 550
Property and equipment, net | [1] | 40 | 42
Total lease assets, net |  | 490 | 592
Current portion of operating lease liabilities |  | 129 | 128
Current portion of finance lease liabilities |  | 13 | 13
Long-term operating lease liabilities |  | 430 | 496
Non-current portion of finance lease liabilities |  | 19 | 22
Total lease liabilities |  | $ 591 | $ 659
Operating Lease, Weighted Average Remaining Lease Term |  | 5 years 10 months 24 days | 6 years 2 months 12 days
Finance Lease, Weighted Average Remaining Lease Term |  | 2 years 9 months 18 days | 3 years 1 month 6 days
Operating Lease, Weighted Average Discount Rate, Percent |  | 4.60% | 5.10%
Finance Lease, Weighted Average Discount Rate, Percent |  | 3.70% | 4.10%
Finance lease asset, accumulated depreciation |  | $ (40) | $ (39)
[1] | Finance lease assets are recorded net of accumulated amortization of $40 million and $39 million at December 31, 2020 and 2019, respectively.

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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=121603541&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from finance lease, classified as noncurrent. + 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=121603541&loc=SL77918627-209977 + Details
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