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Stock Plans: (Activity for Performance Share Units) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2022
Dec. 31, 2021
Dec. 31, 2020
Performance Shares      
Number of Shares (in shares):      
Beginning balance (in shares) 1,537,020    
Granted (in shares) 472,840    
Vested (in shares) (669,960) (189,839) (343,806)
Adjustments for performance achievement (in shares) 223,320    
Forfeited (in shares) (56,030)    
Ending balance (in shares) 1,507,190 1,537,020  
Weighted-Average Grant Date Fair Value:      
Compensation expense for share-based awards $ 48 $ 71 $ 38
Performance Share Units, Other Performance Factors      
Weighted-Average Grant Date Fair Value:      
Beginning balance (in dollars per share) $ 82.14    
Granted (in dollars per share) 104.92 $ 81.86 $ 86.04
Vested (in dollars per share) 77.26    
Adjustments for performance achievement (in dollars per share) 77.26    
Forfeited (in dollars per share) 87.23    
Ending balance (in dollars per share) $ 90.31 $ 82.14  
Weighted-average grant date fair value $ 30 $ 28 $ 28
Performance Share Units, TSR Performance Factor      
Weighted-Average Grant Date Fair Value:      
Beginning balance (in dollars per share) $ 96.25    
Granted (in dollars per share) 143.89 $ 106.93 $ 80.36
Vested (in dollars per share) 83.59    
Adjustments for performance achievement (in dollars per share) 83.59    
Forfeited (in dollars per share) 107.46    
Ending balance (in dollars per share) $ 115.45 $ 96.25  
Weighted-average grant date fair value $ 27 $ 25 $ 28
Grant Date Fair Value | Performance Shares      
Weighted-Average Grant Date Fair Value:      
Grant date fair value of awards vested 54 21 35
Fair Value | Performance Shares      
Weighted-Average Grant Date Fair Value:      
Grant date fair value of awards vested $ 74 $ 16 $ 30