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Reportable Segments Geographical information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Segment Reporting Information [Line Items]      
Revenues $ 15,334 $ 19,200 $ 16,610
Long-term assets, excluding goodwill and other intangibles 46,400 44,501 44,995
U.S.      
Segment Reporting Information [Line Items]      
Revenues 15,255 19,036 16,479
Long-term assets, excluding goodwill and other intangibles 46,328 44,425 44,916
Canada      
Segment Reporting Information [Line Items]      
Long-term assets, excluding goodwill and other intangibles 0 1 1
Mexico and other foreign      
Segment Reporting Information [Line Items]      
Revenues 79 164 131
Long-term assets, excluding goodwill and other intangibles $ 72 $ 75 $ 78