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Stock Plans Narrative (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended
Mar. 31, 2012
Y
Mar. 31, 2011
Share-based Compensation Arrangement by Share-based Payment Award Accelerated Compensation Cost $ 27  
Performance Incentive Plan2008 [Member]
   
Estimated common stock to be awarded under a stock benefit plan, maximum limit 70,000,000  
Shares available for grant under the plan 26,074,253  
Non Employee Directors Plan [Member]
   
Estimated common stock to be awarded under a stock benefit plan, maximum limit 1,000,000  
Shares available for grant under the plan 819,195  
Percentage of voting shares that PMI may own, used in determining non-employee director status 50.00%  
Restricted Stock And Deferred Stock Awards Member
   
Number of shares of restricted stock and deferred stock awards granted during period 3,200,000 3,800,000
Weighted-average grant date fair value of restricted stock and deferred stock awards, per share $ 79.42 $ 59.39
Compensation expense for restricted stock and deferred stock awards 77 38
Unrecognized compensation cost related to non-vested restricted stock and deferred stock awards 392  
Restricted stock and deferred stock awards vested during period 3,600,000  
Expected period for recognition of unamortized compensation expense, in years 3  
Restricted Stock And Deferred Stock Awards Vested Member | Grant Date Fair Value [Member]
   
Fair value of vested restricted stock and deferred stock awards 141  
Restricted Stock And Deferred Stock Awards Vested Member | Total Fair Value [Member]
   
Fair value of vested restricted stock and deferred stock awards $ 287