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Leases - Classification of Operating and Finance Leases (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
--- | --- | --- | ---
Operating Leases |  |  |
Operating lease right-of-use assets | $ 888 | $ 899 | $ 0
Short-term operating lease liabilities | 99 | 101 | 0
Long-term operating lease liabilities | 858 | $ 878 | 0
Total operating lease liabilities | 957 |  |
Finance Leases |  |  |
Property, plant and equipment | 7,867 |  | 7,778
Less: Accumulated depreciation and amortization | 5,730 |  | 5,576
Property, plant and equipment, net | 2,137 |  | 2,202
Current portion of long-term debt | 19 |  | 19
Long-term debt, net | 1,601 |  | $ 1,605
Total finance lease liabilities | 4 |  |
Operating leases |  |  |
Operating Leases |  |  |
Operating lease right-of-use assets | 888 |  |
Short-term operating lease liabilities | 99 |  |
Long-term operating lease liabilities | 858 |  |
Total operating lease liabilities | 957 |  |
Finance leases |  |  |
Finance Leases |  |  |
Property, plant and equipment | 7 |  |
Less: Accumulated depreciation and amortization | 3 |  |
Property, plant and equipment, net | 4 |  |
Current portion of long-term debt | 1 |  |
Long-term debt, net | 3 |  |
Total finance lease liabilities | $ 4 |  |

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