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Leases - Classification of Finance Leases (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Finance Leases |  |
Property, plant and equipment | $ 8,293 | $ 7,778
Less: Accumulated depreciation and amortization | 6,086 | 5,576
Property, plant and equipment, net | 2,207 | 2,202
Current portion of long-term debt | 8 | 19
Long-term debt, net | 1,502 | $ 1,605
Total finance lease liabilities | 4 |
Finance leases |  |
Finance Leases |  |
Property, plant and equipment | 7 |
Less: Accumulated depreciation and amortization | 4 |
Property, plant and equipment, net | 3 |
Current portion of long-term debt | 1 |
Long-term debt, net | 3 |
Total finance lease liabilities | $ 4 |

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