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Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Operating Leases |  |  |
Operating Lease ROU Assets | $ 862 | $ 882 | $ 0
Operating Lease Liabilities due Within One Year | 203 | 204 | 0
Operating Lease Liabilities | 667 | $ 684 | 0
Total Operating Lease Liabilities | 870 |  |
Finance Leases |  |  |
Property, Plant and Equipment, at cost | 263 |  |
Accumulated Depreciation | 52 |  |
Property, Plant and Equipment, net | 211 |  |
Long Term Debt and Finance Leases due Within One Year | 5 |  |
Long Term Debt and Finance Leases | 240 |  |
Total Finance Lease Liabilities | $ 245 |  | $ 37
Weighted Average Remaining Lease Term |  |  |
Operating Leases | 6 years 10 months 24 days |  |
Finance Leases | 32 years 4 months 24 days |  |
Weighted Average Discount Rate |  |  |
Operating Leases | 6.71% |  |
Finance Leases | 8.44% |  |

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