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Leases - Components of balance sheet (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Operating lease right-of-use assets | $ 978 | $ 0
Current portion of operating lease liabilities | 215 | 0
Operating lease liabilities | 761 | $ 0
Other Assets [Member] |  |
Finance Lease, Right-of-Use Asset | 141 |
Other Current Liabilities [Member] |  |
Finance Lease, Liability, Current | 17 |
Other Liabilities [Member] |  |
Finance Lease, Liability, Noncurrent | $ 136 |

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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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