v3.26.1
Derivatives and Hedging (Current Period Cash Flow Hedges in AOCI (loss) before Taxes) (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning Balance $ 32,787 $ 28,187
Ending Balance 32,319 $ 30,203
Derivatives designated as cash flow hedges    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Beginning Balance (231)  
Total amount recorded in AOCI 912  
Total amount reclassified from AOCI to income (145)  
Ending Balance 536  
Interest Rate | Derivatives designated as cash flow hedges    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Total amount recorded in AOCI (1)  
Total amount reclassified from AOCI to income 2  
Currency | Derivatives designated as cash flow hedges    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Total amount recorded in AOCI 60  
Total amount reclassified from AOCI to income 3  
Currency/Interest Rate | Derivatives designated as cash flow hedges    
AOCI Including Portion Attributable to Noncontrolling Interest, Net of Tax [Roll Forward]    
Total amount recorded in AOCI 853  
Total amount reclassified from AOCI to income $ (150)