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Total Equity and Other Comprehensive Income (Rollforward of Total Equity) (Details) - USD ($)
shares in Millions, $ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2025
Sep. 30, 2024
Sep. 30, 2025
Sep. 30, 2024
Jun. 30, 2025
Dec. 31, 2024
Jun. 30, 2024
Dec. 31, 2023
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Equity, beginning balance $ 57,655.0 $ 52,681.0 $ 54,469.0 $ 51,141.0        
Net income 1,822.0 1,505.0 4,964.0 4,326.0        
Other comprehensive income (loss), net of tax 605.0 2,356.0 2,488.0 2,622.0        
Cash dividends declared - Common (678.0) (646.0) (1,959.0) (1,893.0)        
Cash dividends declared - Preferred (71.0) (82.0) (225.0) (258.0)        
Preferred stock discount accretion 0.0 0.0 0.0 0.0        
Common stock activity     18.0 16.0        
Treasury stock activity (323.0) (114.0) (685.0) (206.0)        
Other 28.0 29.0 (32.0) (19.0)        
Equity, ending balance 59,038.0 55,729.0 59,038.0 55,729.0        
Preferred stock, par value $ 0.5 $ 0.5 $ 0.5 $ 0.5 $ 0.5 $ 0.5 $ 0.5 $ 0.5
Common Stock                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Beginning balance (in shares) 394 398 396 398        
Beginning balance - Treasury (in shares) (2) (1) (4) (1)        
Equity, beginning balance $ 2,717.0 $ 2,716.0 $ 2,717.0 $ 2,716.0        
Ending balance (in shares) 392 397 392 397        
Equity, ending balance $ 2,717.0 $ 2,716.0 $ 2,717.0 $ 2,716.0        
Capital Surplus - Preferred Stock                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Equity, beginning balance 5,753.0 6,245.0 5,749.0 6,241.0        
Preferred stock discount accretion 2.0 2.0 6.0 6.0        
Equity, ending balance 5,755.0 6,247.0 5,755.0 6,247.0        
Capital Surplus - Common Stock and Other                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Equity, beginning balance 13,056.0 12,853.0 12,961.0 12,779.0        
Common stock activity     18.0 16.0        
Treasury stock activity 6.0 7.0 113.0 84.0        
Other 42.0 43.0 12.0 24.0        
Equity, ending balance 13,104.0 12,903.0 13,104.0 12,903.0        
Retained Earnings                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Equity, beginning balance 60,951.0 57,652.0 59,282.0 56,290.0        
Net income 1,808.0 1,490.0 4,916.0 4,279.0        
Cash dividends declared - Common (678.0) (646.0) (1,959.0) (1,893.0)        
Cash dividends declared - Preferred (71.0) (82.0) (225.0) (258.0)        
Preferred stock discount accretion (2.0) (2.0) (6.0) (6.0)        
Equity, ending balance 62,008.0 58,412.0 62,008.0 58,412.0        
Accumulated Other Comprehensive Income (Loss)                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Equity, beginning balance (4,682.0) (7,446.0) (6,565.0) (7,712.0)        
Other comprehensive income (loss), net of tax 605.0 2,356.0 2,488.0 2,622.0        
Equity, ending balance (4,077.0) (5,090.0) (4,077.0) (5,090.0)        
Treasury Stock                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Equity, beginning balance (20,188.0) (19,378.0) (19,719.0) (19,209.0)        
Treasury stock activity (329.0) (121.0) (798.0) (290.0)        
Equity, ending balance (20,517.0) (19,499.0) (20,517.0) (19,499.0)        
Noncontrolling Interests                
Increase (Decrease) in Stockholders' Equity [Roll Forward]                
Equity, beginning balance 48.0 39.0 44.0 36.0        
Net income 14.0 15.0 48.0 47.0        
Other (14.0) (14.0) (44.0) (43.0)        
Equity, ending balance $ 48.0 $ 40.0 $ 48.0 $ 40.0