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Stock Plans (RSU Awards) (Details) - Restricted Stock Units (RSUs) [Member]
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
year
$ / shares
shares
Jun. 30, 2019
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Number of Shares Granted (in shares) | shares     1,692,650 1,643,780
Weighted-Average Grant Date Fair Value Per RSU Award Granted (in dollars per share) | $ / shares     $ 85.91 $ 77.18
Compensation Expense Related to Awards $ 29 $ 28 $ 68 $ 64
Unrecognized compensation cost related to non-vested stock awards $ 194   $ 194  
Award requisite service period     3 years  
Minimum retirement age | year     58  
Stock awards vested during period (in shares) | shares     1,106,174  
Grant Date Fair Value [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of vested stock awards     $ 108  
Total Fair Value [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Fair value of vested stock awards     $ 95