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Stock Compensation Plans Cash Awards (Details 3) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation by Share-based Payment Award      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 97    
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 [Member] | 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%    
Cash Units and Cash Performance Units [Member]      
Share-based Compensation by Share-based Payment Award      
Share-based Payment Arrangement, Nonvested Award, Cost Not yet Recognized, Amount $ 121    
Cash Units and Cash Performance Units [Member] | Minimum      
Share-based Compensation by Share-based Payment Award      
Deferred Compensation Cash-based Arrangements, Liability, Current 31 $ 36 $ 36
Cash Units and Cash Performance Units [Member] | Maximum [Member]      
Share-based Compensation by Share-based Payment Award      
Deferred Compensation Cash-based Arrangements, Liability, Current $ 175 $ 203 $ 205