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Segment Information - Reconciliation of Operating Revenues (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2024
Jun. 30, 2023
Jun. 30, 2024
Jun. 30, 2023
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating revenues $ 32,796 $ 32,596 $ 65,777 $ 65,508
Operating Segments        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating revenues 32,227 32,041 64,660 64,392
Corporate and other        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating revenues 633 621 1,244 1,238
Eliminations        
Segment Reporting, Revenue Reconciling Item [Line Items]        
Operating revenues $ (64) $ (66) $ (127) $ (122)