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Leases - Lease-related Assets and Liabilities recorded on the Balance Sheet (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Assets |  |
Operating lease assets | $ 60 | $ 0
Finance lease assets | 67 |
Total lease assets | 127 |
Liabilities |  |
Current portion of operating lease liability | 17 | 0
Current portion of finance lease liability | 21 | 17
Noncurrent portion of operating lease liability | 48 | 0
Finance lease liability | 38 | $ 30
Total lease liabilities | $ 124 |
Weighted-average remaining lease term |  |
Weighted-average remaining lease term, operating leases | 4 years 2 months 4 days |
Weighted-average remaining lease term, finance leases | 2 years 7 months 9 days |
Weighted-average discount rate |  |
Weighted-average discount rate, operating leases (percentage) | 5.00% |
Weighted-average discount rate, operating leases (percentage) | 4.90% |

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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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