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Equity - Components of Accumulated Other Comprehensive Income (Loss) (Details) - USD ($)
$ in Millions
Dec. 31, 2024
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss), net of deferred taxes $ 86,038 $ 83,226 $ 81,627  
Cumulative translation adjustments        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss), net of deferred taxes (2,474) (1,596)    
Deferred gains (losses) on cash flow hedges        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss), net of deferred taxes 106 49    
Unrecognized gains (losses) on employee benefit obligations and other        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss), net of deferred taxes 325 293    
Accumulated Other Comprehensive Income (Loss)        
Accumulated Other Comprehensive Income (Loss) [Line Items]        
Accumulated other comprehensive income (loss), net of deferred taxes $ (2,043) $ (1,253) $ (2,611) $ 1,480