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Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Jan. 01, 2019
--- | --- | ---
Lessee, Lease, Description [Line Items] |  |
Operating lease, liability, current |  | $ 45
Operating lease, liability, noncurrent |  | $ 214
Property and equipment, net |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease, liability, current | $ 0 |
Finance lease, liability, current | 35 |
Notes payable |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease, liability, current | 0 |
Finance lease, liability, current | 7 |
Accrued liabilities |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease, liability, current | 38 |
Finance lease, liability, current | 0 |
Long-term debt |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease, liability, noncurrent | 0 |
Finance lease, liability, noncurrent | 28 |
Other liabilities |  |
Lessee, Lease, Description [Line Items] |  |
Operating lease, liability, noncurrent | 168 |
Finance lease, liability, noncurrent | $ 0 |

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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=77888419&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=77888419&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating 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=77888419&loc=SL77918627-209977 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating 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=77888419&loc=SL77918627-209977 + Details
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