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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