v3.26.3
Equity and Accumulated Other Comprehensive Loss - Changes in AOCI (Detail) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2026
Sep. 30, 2025
Sep. 30, 2026
Sep. 30, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     $ 105,741  
Ending balance $ 107,292 $ 106,345 107,292 $ 106,345
Accumulated Other Comprehensive Loss        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (1,784) (1,475) (1,727) (923)
Other comprehensive income (loss)     (489)  
Amounts reclassified to net income     48  
Net other comprehensive income (loss) 160 (176) 103 (728)
Ending balance (1,624) $ (1,651) (1,624) $ (1,651)
Foreign  currency translation adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (607)  
Other comprehensive income (loss)     (25)  
Net other comprehensive income (loss)     (25)  
Ending balance (632)   (632)  
Unrealized gain (loss) on cash flow hedges        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (989)  
Amounts reclassified to net income     66  
Net other comprehensive income (loss)     66  
Ending balance (923)   (923)  
Unrealized gain (loss) on fair value hedges        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (328)  
Other comprehensive income (loss)     544  
Amounts reclassified to net income     (49)  
Net other comprehensive income (loss)     495  
Ending balance 167   167  
Unrealized loss on marketable securities        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     0  
Other comprehensive income (loss)     (13)  
Net other comprehensive income (loss)     (13)  
Ending balance (13)   (13)  
Defined benefit pension and postretirement plans        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     197  
Other comprehensive income (loss)     (451)  
Amounts reclassified to net income     31  
Net other comprehensive income (loss)     (420)  
Ending balance $ (223)   $ (223)