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Reportable Segments Geographical information (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Segment Reporting Information [Line Items] |  |  |
Total Revenues | $ 13,209 | $ 14,144 | $ 13,705
Long-term assets, excluding goodwill and other intangibles | 46,792 | 48,299 | 51,079
U.S. |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 12,833 | 13,596 | 13,073
Long-term assets, excluding goodwill and other intangibles | 46,709 | 47,468 | 47,928
Canada |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 300 | 447 | 503
Long-term assets, excluding goodwill and other intangibles | 1 | 748 | 3,071
Mexico and other foreign |  |  |
Segment Reporting Information [Line Items] |  |  |
Total Revenues | 76 | 101 | 129
Long-term assets, excluding goodwill and other intangibles | $ 82 | $ 83 | $ 80

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