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Condensed Consolidated Statements of Changes in Common Shareholders' Equity (Unaudited) - USD ($)
$ in Millions
Total
Common shares
Treasury shares
Paid-in-surplus
Retained earnings
AOCI
 [1]
Beginning balance (in shares) at Dec. 31, 2023   1,112,900,000        
Beginning balance (in shares) at Dec. 31, 2023     (503,200,000)      
Beginning balance at Dec. 31, 2023 $ 14,788 $ 2,782 $ (54,666) $ 5,193 $ 62,093 $ (614)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 1,641       1,641  
Other comprehensive income/(loss) 4 [2]         4
Conversion, stock option exercises, forfeitures, ESPP, and other (in shares) [3]   100,000 200,000      
Conversion, stock option exercises, forfeitures, ESPP, and other [3] $ 26 $ 1 $ 5 20    
Share repurchase programs (Note 15) (in shares) 0          
Share repurchase programs (Note 15) $ 0          
Dividends declared (794)       (794)  
Ending balance (in shares) at Mar. 31, 2024   1,113,000,000        
Ending balance (in shares) at Mar. 31, 2024     (503,000,000.0)      
Ending balance at Mar. 31, 2024 $ 15,665 $ 2,783 $ (54,661) 5,213 62,940 (610)
Beginning balance (in shares) at Dec. 31, 2024 604,241,260 1,113,000,000        
Beginning balance (in shares) at Dec. 31, 2024     (508,800,000)      
Beginning balance at Dec. 31, 2024 $ 16,890 $ 2,783 $ (56,132) 5,334 65,628 (723)
Increase (Decrease) in Stockholders' Equity [Roll Forward]            
Net income 1,626       1,626  
Other comprehensive income/(loss) 3 [2]         3
Conversion, stock option exercises, forfeitures, ESPP, and other (in shares) [3]   200,000 300,000      
Conversion, stock option exercises, forfeitures, ESPP, and other [3] $ 65   $ 24 41    
Share repurchase programs (Note 15) (in shares) (5,745,601)   (5,700,000)      
Share repurchase programs (Note 15) $ (1,741)   $ (1,441) (300)    
Dividends declared $ (804)       (804)  
Ending balance (in shares) at Mar. 31, 2025 598,992,024 1,113,200,000        
Ending balance (in shares) at Mar. 31, 2025     (514,200,000)      
Ending balance at Mar. 31, 2025 $ 16,039 $ 2,783 $ (57,549) $ 5,075 $ 66,450 $ (720)
[1] AOCI = accumulated other comprehensive income/loss (Note 8)
[2] Net of deferred taxes of $(0.2) million and ($0.1) million during the three months ended March 31, 2025 and 2024, respectively.
[3] ESPP = employee stock purchase plan