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Leases - Future Minimum Lease Payments Due Under ASC 842 Guidance (Details) - USD ($) $ in Millions | Jun. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Operating Leases |  |
2019 (excluding the six months ended June 30, 2019) | $ 155 |
2020 | 259 |
2021 | 214 |
2022 | 169 |
2023 | 126 |
Thereafter | 762 |
Total future lease payments | 1,685 |
Less imputed interest | 333 |
Present value of future lease payments | 1,352 |
Less current portion of lease liabilities | 240 | $ 0
Long-term lease liabilities | 1,112 | $ 0
ROU assets | 1,280 |
Finance Leases |  |
2019 (excluding the six months ended June 30, 2019) | 44 |
2020 | 81 |
2021 | 75 |
2022 | 74 |
2023 | 28 |
Thereafter | 66 |
Total future lease payments | 368 |
Less imputed interest | 72 |
Present value of future lease payments | 296 |
Less current portion of lease liabilities | 64 |
Long-term lease liabilities | 232 |
ROU assets | $ 338 |

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