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Stock Plans (Narrative) (Details)
$ in Millions
12 Months Ended
Dec. 31, 2019
USD ($)
year
performance_metric
shares
Dec. 31, 2018
shares
Dec. 31, 2017
shares
May 31, 2017
shares
Minimum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage 0.00%      
Maximum [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Vesting percentage 200.00%      
Restricted Stock Units (RSUs) [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award requisite service period 3 years      
Minimum retirement age | year 58      
Unamortized compensation cost related to restricted stock and deferred stock awards | $ $ 124      
Weighted-average recognition period 2 years      
Vested (in shares) 1,126,057 1,451,876 2,022,856  
Performance Shares [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Award requisite service period 3 years      
Minimum retirement age | year 58      
Unamortized compensation cost related to restricted stock and deferred stock awards | $ $ 33      
Weighted-average recognition period 2 years      
Performance period 3 years      
Total Shareholder Return (TSR) relative to a predetermined peer group 50.00%      
Currency-neutral compound annual adjusted operating income growth rate, excluding acquisitions 30.00%      
Performance against specific measures of transformation 20.00%      
Number of performance metrics used to determine the percentage of PSU's that will vest | performance_metric 3      
Aggregate weighted performance factor that determines if the target number of PSU's will vest 100.00%      
Number of shares of common stock issued for each vested PSU 1      
Vested (in shares) 330,616 0 0  
2017 Performance Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated common stock to be awarded under a stock benefit plan, maximum limit (in shares)       25,000,000
Shares available for grant under the plan (in shares) 20,127,360      
2017 Non Employee Directors Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]        
Estimated common stock to be awarded under a stock benefit plan, maximum limit (in shares)       1,000,000
Shares available for grant under the plan (in shares) 954,084      
Percentage of voting shares that PMI may own, used in determining non-employee director status       50.00%