v3.24.0.1
Stock Plans: (Activity for Performance Share Units) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2023
Dec. 31, 2022
Dec. 31, 2021
Performance Shares      
Number of Shares      
Beginning balance (in shares) 1,507,190    
Granted (in shares) 482,360    
Vested (in shares) 902,232 669,960 189,839
Adjustments for performance achievement (in shares) 400,992    
Forfeited (in shares) (61,030)    
Ending balance (in shares) 1,427,280 1,507,190  
Weighted- Average Grant Date Fair Value Per Share      
Compensation expense for share-based awards $ 59 $ 48 $ 71
Performance Share Units, Other Performance Factors      
Weighted- Average Grant Date Fair Value Per Share      
Beginning balance (in dollars per share) $ 90.31    
Granted (in dollars per share) 102.02 $ 104.92 $ 81.86
Vested (in dollars per share) 85.99    
Adjustments for performance achievement (in dollars per share) 85.99    
Forfeited (in dollars per share) 98.24    
Ending balance (in dollars per share) $ 95.45 $ 90.31  
Weighted-average grant date fair value $ 29 $ 30 $ 28
Performance Share Units, TSR Performance Factor      
Weighted- Average Grant Date Fair Value Per Share      
Beginning balance (in dollars per share) $ 115.45    
Granted (in dollars per share) 133.54 $ 143.89 $ 106.93
Vested (in dollars per share) 98.45    
Adjustments for performance achievement (in dollars per share) 98.45    
Forfeited (in dollars per share) 131.39    
Ending balance (in dollars per share) $ 126.86 $ 115.45  
Weighted-average grant date fair value $ 26 $ 27 $ 25
Grant Date Fair Value | Performance Shares      
Weighted- Average Grant Date Fair Value Per Share      
Grant date fair value of awards vested 83 54 21
Fair Value | Performance Shares      
Weighted- Average Grant Date Fair Value Per Share      
Grant date fair value of awards vested $ 91 $ 74 $ 16