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v3.19.1

Segments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Segment Reporting Information, Profit (Loss) |  |
Operating revenue | $ 10,472 | $ 9,968
Intersegment Sales/Other | Exchanged products |  |
Segment Reporting Information, Profit (Loss) |  |
Operating revenue | $ (732) | $ (876)

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