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Stock Plans (Activity for Performance Share Units) (Details) - USD ($)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Performance Shares [Member]      
Number of Shares (in shares):      
Beginning Balance (in shares) 1,194,970    
Granted (in shares) 647,700    
Vested (in shares) (330,616) 0 0
Forfeited (in shares) (164,594)    
Ending Balance (in shares) 1,347,460 1,194,970  
Weighted-Average Grant Date Fair Value:      
Compensation expense for share-based awards $ 54 $ 24 $ 37
Performance Share Units, TSR Relative To Customer Peer Group [Member]      
Weighted-Average Grant Date Fair Value:      
Beginning Balance (in dollars per share) $ 117.09    
Granted (in dollars per share) 83.59 $ 118.98 $ 128.72
Vested (in dollars per share) 104.60    
Forfeited (in dollars per share) 107.09    
Ending Balance (in dollars per share) $ 107.61 $ 117.09  
Weighted-average grant date fair value $ 21 $ 24 $ 25
Performance Share Units, Other Performance Factors [Member]      
Weighted-Average Grant Date Fair Value:      
Beginning Balance (in dollars per share) $ 95.85    
Granted (in dollars per share) 77.23 $ 100.69 $ 98.29
Vested (in dollars per share) 89.02    
Forfeited (in dollars per share) 90.28    
Ending Balance (in dollars per share) $ 88.19 $ 95.85  
Weighted-average grant date fair value $ 30 $ 20 $ 19
Grant Date Fair Value [Member] | Performance Shares [Member]      
Weighted-Average Grant Date Fair Value:      
Grant Date Fair Value of Awards Vested 32    
Fair Value [Member] | Performance Shares [Member]      
Weighted-Average Grant Date Fair Value:      
Grant Date Fair Value of Awards Vested $ 28