v3.26.1
Equity and Accumulated Other Comprehensive Loss - Changes in AOCI (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     $ 105,741  
Ending balance $ 105,196 $ 104,361 105,196 $ 104,361
Accumulated Other Comprehensive Loss        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance (2,372) (1,489) (1,727) (923)
Other comprehensive income (loss)     (474)  
Amounts reclassified to net income     31  
Net other comprehensive income (loss) 588 14 (57) (552)
Ending balance (1,784) $ (1,475) (1,784) $ (1,475)
Foreign  currency translation adjustments        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     (607)  
Other comprehensive income (loss)     (20)  
Net other comprehensive income (loss)     (20)  
Ending balance (627)   (627)  
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     46  
Net other comprehensive income (loss)     46  
Ending balance (943)   (943)  
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)     386  
Amounts reclassified to net income     (32)  
Net other comprehensive income (loss)     354  
Ending balance 26   26  
Unrealized loss on marketable securities        
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]        
Beginning balance     0  
Other comprehensive income (loss)     (2)  
Net other comprehensive income (loss)     (2)  
Ending balance (2)   (2)  
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)     (452)  
Amounts reclassified to net income     17  
Net other comprehensive income (loss)     (435)  
Ending balance $ (238)   $ (238)