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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