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Stock-Based Compensation (Details)
12 Months Ended
Dec. 31, 2015
individual
shares
Dec. 31, 2014
shares
Dec. 31, 2013
shares
May. 31, 2012
shares
Share-based Compensation Arrangement by Share-based Payment Award Activity        
Number of participants with outstanding options, restricted stock, or restricted stock units | individual 9,200      
Retirement age eligibility for employees 55 years      
Retirement eligibility for employees, minimum years of service required 5 years      
Percent of stock-based compensation related to retiree-eligible population (as a percent) 35.00%      
General Employees' Stock Purchase Plan (GESPP)        
Share-based Compensation Arrangement by Share-based Payment Award Activity        
Number of shares authorized 60,000,000      
Number of shares available for grant under the 2008 Long Term Incentive Plan Program (including additional subsequent shareholder approvals) 28,104,335 29,112,004 30,185,960  
Long Term Incentive Plan [Member]        
Share-based Compensation Arrangement by Share-based Payment Award Activity        
Number of shares authorized       100,000,000
Awards other than options and Stock Appreciation Rights, number of shares counted for every one share awarded under plan limit with grant dates prior to May 11, 2010 3.38      
Awards other than options and Stock Appreciation Rights, number of shares counted for every one share awarded under plan limit with grant dates on or after May 11, 2010 and prior to May 8, 2012 2.87      
Awards other than options and Stock Appreciation Rights, number of shares counted for every one share awarded under plan limit with grant dates of May 8, 2012, or later 3.50      
Number of shares available for grant under the 2008 Long Term Incentive Plan Program (including additional subsequent shareholder approvals) 20,328,681