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Stock Plans (Activity for Performance Share Units) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Performance Shares      
Number of Shares (in shares):      
Beginning balance (in shares) 1,472,800    
Granted (in shares) 574,410    
Vested (in shares) (189,839) (343,806) (330,616)
Forfeited (in shares) (320,351)    
Ending balance (in shares) 1,537,020 1,472,800  
Weighted-Average Grant Date Fair Value:      
Compensation expense for share-based awards $ 71 $ 38 $ 54
Performance Share Units, Other Performance Factors      
Weighted-Average Grant Date Fair Value:      
Beginning balance (in dollars per share) $ 86.76    
Granted (in dollars per share) 81.86 $ 86.04 $ 77.23
Vested (in dollars per share) 100.69    
Forfeited (in dollars per share) 97.76    
Ending balance (in dollars per share) $ 82.14 $ 86.76  
Weighted-average grant date fair value $ 28 $ 28 $ 30
Performance Share Units, TSR Performance Factor      
Weighted-Average Grant Date Fair Value:      
Beginning balance (in dollars per share) $ 90.48    
Granted (in dollars per share) 106.93 $ 80.36 $ 83.59
Vested (in dollars per share) 118.98    
Forfeited (in dollars per share) 72.55    
Ending balance (in dollars per share) $ 96.25 $ 90.48  
Weighted-average grant date fair value $ 25 $ 28 $ 21
Grant Date Fair Value | Performance Shares      
Weighted-Average Grant Date Fair Value:      
Grant date fair value of awards vested 21 35 32
Fair Value | Performance Shares      
Weighted-Average Grant Date Fair Value:      
Grant date fair value of awards vested $ 16 $ 30 $ 28