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Leases Components of balance sheet (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Operating lease right-of-use assets (non-current) | $ 931 | $ 0
Current portion of operating lease liabliities | 208 | 0
Operating lease liabilities (non-current) | 825 | $ 0
Other assets |  |
Finance leases - Other assets (non-current) | 123 |
Other current liabilities |  |
Finance leases - Other current liabilities | 19 |
Other liabilities |  |
Finance leases - Other liabilities (non-current) | $ 124 |

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