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Reportable Segments Geographical information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Segment Reporting Information [Line Items] |  |  |
Total Revenues | $ 14,144 | $ 13,705 | $ 13,058
Long-term assets, excluding goodwill and other intangibles | 48,299 | 51,079 | 51,606
U.S. |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 13,596 | 13,073 | 12,459
Long-term assets, excluding goodwill and other intangibles | 47,468 | 47,928 | 49,125
Canada |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 447 | 503 | 483
Long-term assets, excluding goodwill and other intangibles | 748 | 3,071 | 2,399
Mexico and other foreign |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 101 | 129 | 116
Long-term assets, excluding goodwill and other intangibles | $ 83 | $ 80 | $ 82

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