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Stock Plans (Details) (USD $)
In Millions, except Share data, unless otherwise specified
3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Employee Service Share Based Compensation Allocation of Recognized Period Costs [Line Items]        
Minimum Retirement Age     58 years  
Restricted Stock and Deferred Stock Awards [Member]
       
Employee Service Share Based Compensation Allocation of Recognized Period Costs [Line Items]        
Number of shares of stock awards granted during period     2,400,000 2,800,000
Weighted-average grant date fair value of stock awards, per share (in dollars per share)     $ 77.74 $ 88.43
Compensation expense for stock awards $ 48 $ 48 $ 161 $ 172
Unrecognized compensation cost related to non-vested stock awards 236   236  
Stock awards vested during period     3,500,000  
Restricted Stock and Deferred Stock Awards [Member] | Grant Date Fair Value [Member]
       
Employee Service Share Based Compensation Allocation of Recognized Period Costs [Line Items]        
Fair value of vested stock awards     212  
Restricted Stock and Deferred Stock Awards [Member] | Total Fair Value [Member]
       
Employee Service Share Based Compensation Allocation of Recognized Period Costs [Line Items]        
Fair value of vested stock awards     $ 277  
Restricted Stock and Deferred Stock Awards [Member] | Minimum [Member]
       
Employee Service Share Based Compensation Allocation of Recognized Period Costs [Line Items]        
Expected period for recognition of unamortized compensation expense, in years     3 years  
2012 Performance Incentive Plan [Member]
       
Employee Service Share Based Compensation Allocation of Recognized Period Costs [Line Items]        
Estimated common stock to be awarded under a stock benefit plan, maximum limit 30,000,000   30,000,000  
Shares available for grant under the plan 24,799,010   24,799,010  
Non Employee Directors Plan [Member]
       
Employee Service Share Based Compensation Allocation of Recognized Period Costs [Line Items]        
Estimated common stock to be awarded under a stock benefit plan, maximum limit 1,000,000   1,000,000  
Shares available for grant under the plan 715,904   715,904  
Percentage of voting shares that PMI may own, used in determining non-employee director status     50.00%