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Leases - Classification of Operating and Finance Leases (Details) - USD ($) $ in Millions | Sep. 30, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Operating Leases |  |  |
Operating lease right-of-use assets | $ 970 | $ 975 | $ 0
Short-term operating lease liabilities | 115 | 112 | 0
Long-term operating lease liabilities | 931 | $ 949 | 0
Total operating lease liabilities | 1,046 |  |
Finance Leases |  |  |
Property, plant and equipment | 12,522 |  | 12,074
Less: Accumulated depreciation and amortization | 9,169 |  | 8,728
Property, plant and equipment, net | 3,353 |  | 3,346
Current portion of long-term debt | 21 |  | 21
Long-term debt, net | 2,405 |  | $ 2,418
Total finance lease liabilities | 7 |  |
Operating leases |  |  |
Operating Leases |  |  |
Operating lease right-of-use assets | 970 |  |
Short-term operating lease liabilities | 115 |  |
Long-term operating lease liabilities | 931 |  |
Total operating lease liabilities | 1,046 |  |
Finance leases |  |  |
Finance Leases |  |  |
Property, plant and equipment | 18 |  |
Less: Accumulated depreciation and amortization | 5 |  |
Property, plant and equipment, net | 13 |  |
Current portion of long-term debt | 1 |  |
Long-term debt, net | 6 |  |
Total finance lease liabilities | $ 7 |  |

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