v3.26.1
Total Equity and Other Comprehensive Income (Rollforward of Total Equity) (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Mar. 31, 2026
Dec. 31, 2025
Mar. 31, 2025
Jun. 30, 2024
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Equity, beginning balance $ 63,676.0 $ 56,451.0 $ 60,636.0 $ 54,469.0        
Net income 2,055.0 1,643.0 3,827.0 3,142.0        
Other comprehensive income (loss), net of tax (347.0) 555.0 (712.0) 1,883.0        
Cash dividends declared - Common (691.0) (642.0) (1,387.0) (1,281.0)        
Cash dividends declared - Preferred (85.0) (83.0) (158.0) (154.0)        
Preferred stock discount accretion 0.0 0.0 0.0 0.0        
Common stock activity 17.0 18.0 2,918.0 18.0        
Treasury stock activity (599.0) (326.0) (1,167.0) (362.0)        
Other 35.0 39.0 104.0 (60.0)        
Equity, ending balance 64,061.0 57,655.0 64,061.0 57,655.0        
Preferred stock, par value $ 0.5 $ 0.5 0.5 $ 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) 402 396 390 396        
Treasury stock activity (in shares) (3) (2) (5) (2)        
Equity, beginning balance $ 2,786.0 $ 2,717.0 $ 2,717.0 $ 2,717.0        
Common stock activity (in shares) 0   14          
Common stock activity $ 0.0   $ 69.0          
Ending balance (in shares) 399 394 399 394        
Equity, ending balance $ 2,786.0 $ 2,717.0 $ 2,786.0 $ 2,717.0        
Capital Surplus - Preferred Stock                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Equity, beginning balance 5,878.0 5,751.0 5,758.0 5,749.0        
Preferred stock discount accretion 2.0 2.0 3.0 4.0        
Other     119.0          
Equity, ending balance 5,880.0 5,753.0 5,880.0 5,753.0        
Capital Surplus - Common Stock and Other                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Equity, beginning balance 16,048.0 12,980.0 13,164.0 12,961.0        
Common stock activity 17.0 18.0 2,849.0 18.0        
Treasury stock activity 8.0 5.0 96.0 107.0        
Other 46.0 53.0 10.0 (30.0)        
Equity, ending balance 16,119.0 13,056.0 16,119.0 13,056.0        
Retained Earnings                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Equity, beginning balance 64,256.0 60,051.0 63,266.0 59,282.0        
Net income 2,040.0 1,627.0 3,800.0 3,108.0        
Cash dividends declared - Common (691.0) (642.0) (1,387.0) (1,281.0)        
Cash dividends declared - Preferred (85.0) (83.0) (158.0) (154.0)        
Preferred stock discount accretion (2.0) (2.0) (3.0) (4.0)        
Equity, ending balance 65,518.0 60,951.0 65,518.0 60,951.0        
Accumulated Other Comprehensive Income (Loss)                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Equity, beginning balance (3,773.0) (5,237.0) (3,408.0) (6,565.0)        
Other comprehensive income (loss), net of tax (347.0) 555.0 (712.0) 1,883.0        
Equity, ending balance (4,120.0) (4,682.0) (4,120.0) (4,682.0)        
Treasury Stock                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Equity, beginning balance (21,568.0) (19,857.0) (20,912.0) (19,719.0)        
Treasury stock activity (607.0) (331.0) (1,263.0) (469.0)        
Equity, ending balance (22,175.0) (20,188.0) (22,175.0) (20,188.0)        
Noncontrolling Interests                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Equity, beginning balance 49.0 46.0 51.0 44.0        
Net income 15.0 16.0 27.0 34.0        
Other (11.0) (14.0) (25.0) (30.0)        
Equity, ending balance $ 53.0 $ 48.0 $ 53.0 $ 48.0