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Stock Compensation Plans and Other Compensation Arrangements (Details 3) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Share-based Compensation by Share-based Payment Award      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 397,000 483,000 539,000
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 91    
Weighted-average period for unrecognized compensation expense to be charged to expense 1 year 3 months    
Stock plans, vesting period 3 years    
Stock issued, settlement of fully vested stock awards, fair value grant date $ 96 $ 97 $ 143
Available for future grant 5,100,000    
2011 Long-Term Incentive Stock Plan      
Share-based Compensation by Share-based Payment Award      
Available for future grant 6,300,000    
Amended 2011 Plan [Domain]      
Share-based Compensation by Share-based Payment Award      
Share-based Compensation Arrangement by Share-based Payment Award, Number of Additional Shares Authorized 2,400,000    
Minimum      
Share-based Compensation by Share-based Payment Award      
Required service period under 2011 Plan and 1993 SPND (years) 5 years    
Minimum | Grants During 2010 and After [Member]      
Share-based Compensation by Share-based Payment Award      
Share Based Compensation Arrangement By Share Based Payment Award Award Grants Percentage Financial Metric Met Exceeded 0.00%    
Maximum | Grants During 2010 and After [Member]      
Share-based Compensation by Share-based Payment Award      
Share Based Compensation Arrangement By Share Based Payment Award Award Grants Percentage Financial Metric Met Exceeded 200.00%    
Employee Stock Option [Member]      
Share-based Compensation by Share-based Payment Award      
Stock options, issued   0  
Cash Units and Cash Performance Units [Member]      
Share-based Compensation by Share-based Payment Award      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost Not yet Recognized $ 133    
Cash Units and Cash Performance Units [Member] | Minimum      
Share-based Compensation by Share-based Payment Award      
Deferred Compensation Cash-based Arrangements, Liability, Current 38 $ 39 37
Cash Units and Cash Performance Units [Member] | Maximum      
Share-based Compensation by Share-based Payment Award      
Deferred Compensation Cash-based Arrangements, Liability, Current $ 201 $ 199 $ 194