v3.26.1
Total Equity and Other Comprehensive Income (Rollforward of Total Equity) (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended
Mar. 31, 2026
Mar. 31, 2025
Dec. 31, 2025
Dec. 31, 2024
Mar. 31, 2024
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Equity, beginning balance $ 60,636.0 $ 54,469.0      
Net income 1,772.0 1,499.0      
Other comprehensive income (loss), net of tax (365.0) 1,328.0      
Cash dividends declared - Common (696.0) (639.0)      
Cash dividends declared - Preferred (73.0) (71.0)      
Preferred stock discount accretion/premium amortization 0.0 0.0      
Common stock activity (b) 2,901.0        
Treasury stock activity (568.0) (36.0)      
Other 69.0 (99.0)      
Equity, ending balance 63,676.0 56,451.0      
Preferred stock, par value 0.5 $ 0.5 $ 0.5 $ 0.5 $ 0.5
Restricted stock acquisition consideration 29.0        
Common Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issuances, value 2,900.0        
Preferred Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Stock issuances, value $ 119.0        
Common Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Beginning balance (in shares) 390 396      
Treasury stock activity (in shares) (2)        
Equity, beginning balance $ 2,717.0 $ 2,717.0      
Common stock activity (in shares) 14        
Common stock activity (b) $ 69.0        
Ending balance (in shares) 402 396      
Equity, ending balance $ 2,786.0 $ 2,717.0      
Capital Surplus - Preferred Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Equity, beginning balance 5,758.0 5,749.0      
Preferred stock discount accretion/premium amortization 1.0 2.0      
Other 119.0        
Equity, ending balance 5,878.0 5,751.0      
Capital Surplus - Common Stock and Other          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Equity, beginning balance 13,164.0 12,961.0      
Common stock activity (b) 2,832.0        
Treasury stock activity 88.0 102.0      
Other (36.0) (83.0)      
Equity, ending balance 16,048.0 12,980.0      
Retained Earnings          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Equity, beginning balance 63,266.0 59,282.0      
Net income 1,760.0 1,481.0      
Cash dividends declared - Common (696.0) (639.0)      
Cash dividends declared - Preferred (73.0) (71.0)      
Preferred stock discount accretion/premium amortization (1.0) (2.0)      
Equity, ending balance 64,256.0 60,051.0      
Accumulated Other Comprehensive Income (Loss)          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Equity, beginning balance (3,408.0) (6,565.0)      
Other comprehensive income (loss), net of tax (365.0) 1,328.0      
Equity, ending balance (3,773.0) (5,237.0)      
Treasury Stock          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Equity, beginning balance (20,912.0) (19,719.0)      
Treasury stock activity (656.0) (138.0)      
Equity, ending balance (21,568.0) (19,857.0)      
Noncontrolling Interests          
Increase (Decrease) in Stockholders' Equity [Roll Forward]          
Equity, beginning balance 51.0 44.0      
Net income 12.0 18.0      
Other (14.0) (16.0)      
Equity, ending balance $ 49.0 $ 46.0