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Leases - Supplemental Balance Sheet Information (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Leases [Abstract] |  |
Total operating lease liabilities | $ 636 | $ 0
Other current liabilities | 179 |
Operating lease liabilities | 470 | $ 0
Total operating lease liabilities | 649 |
Finance leases, net of amortization (within property, plant & equipment) | 53 |
Other current liabilities | 18 |
Other long-term liabilities | 37 |
Total finance lease liabilities | $ 55 |
Operating leases, weighted average remaining lease term | 5 years 4 months 24 days |
Finance leases, weighted average remaining lease term | 2 years 10 months 24 days |
Operating leases, weighted average discount rate | 3.60% |
Finance leases, weighted average discount rate | 5.20% |

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