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Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Operating Lease [Abstract] |  |  |
Operating lease right-of-use assets | $ 428 | $ 347 | $ 0
Operating lease current liabilities | 46 | 30 | 0
Operating lease liabilities | 397 | $ 339 | $ 0
Total operating lease liabilities | 443 |  |
Finance Lease [Abstract] |  |  |
Property and equipment, gross | 31 |  |
Accumulated depreciation | (22) |  |
Property and equipment, net | 9 |  |
Current maturities of debt | 4 |  |
Long-term debt | 1 |  |
Total finance lease liabilities | $ 5 |  |
Weighted average remaining lease term, operating leases (years) | 10 years |  |
Weighted average remaining lease term, finance leases (years) | 2 years |  |
Weighted average discount rate, operating lease (as a percent) | 5.30% |  |
Weighted average discount rate, finance lease (as a percent) | 1.90% |  |

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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=77888426&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=77888419&loc=SL77918627-209977 + Details
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