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Reportable Segments Geographical information (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Segment Reporting Information [Line Items]      
Revenues $ 15,100 $ 15,334 $ 19,200
Long-term assets, excluding goodwill and other intangibles 47,042 46,400 44,501
U.S.      
Segment Reporting Information [Line Items]      
Revenues 15,057 15,255 19,036
Long-term assets, excluding goodwill and other intangibles 46,972 46,328 44,425
Canada      
Segment Reporting Information [Line Items]      
Long-term assets, excluding goodwill and other intangibles 0 0 1
Mexico and other foreign      
Segment Reporting Information [Line Items]      
Revenues 43 79 164
Long-term assets, excluding goodwill and other intangibles $ 70 $ 72 $ 75