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Segment Information - Reconciliation of Operating Revenues (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2024
Sep. 30, 2023
Sep. 30, 2024
Sep. 30, 2023
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating revenues $ 33,330 $ 33,336 $ 99,107 $ 98,844
Operating Segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating revenues 32,711 32,784 97,371 97,176
Corporate and other        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating revenues 685 618 1,929 1,856
Eliminations        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating revenues $ (66) $ (66) $ (193) $ (188)