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Share-based Compensation (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Jun. 01, 2020
Share-based Compensation Arrangement by Share-based Payment Award, Number of Shares Available for Grant 36,000,000   36,000,000      
Allocated Share-based Compensation Expense $ 62 $ 13 $ 127 $ 43    
Granted, number of shares (in shares)     10,653,000      
Chief Executive Officer [Member]            
Decrease In Salary           40.00%
Other Executive Officers [Member]            
Decrease In Salary           30.00%
Director [Member]            
Decrease In Salary           40.00%
Executive Officer [Member]            
Allocated Share-based Compensation Expense $ 49   $ 84      
Long-Term Incentive Plan     75.00%   40.00%  
Employee Stock Option [Member]            
Share-based compensation award expiration period     10 years      
Granted, number of shares (in shares) 0 0 0 0    
Employee Stock Option [Member] | Executive Officer [Member]            
Vesting period     3 years      
Restricted Stock Units (RSUs) [Member] | Executive Officer [Member]            
Vesting period     3 years      
Minimum [Member] | Salaried Employees [Member]            
Decrease In Salary           5.00%
Minimum [Member] | Employee Stock Option [Member]            
Stock Options Exercisable Period from Date of Grant     1 year      
Minimum [Member] | Restricted Stock and Restricted Stock Units [Member]            
Stock Options Exercisable Period from Date of Grant     1 year      
Share-based compensation award expiration period     1 year      
Maximum [Member] | Salaried Employees [Member]            
Decrease In Salary           30.00%
Maximum [Member] | Employee Stock Option [Member]            
Stock Options Exercisable Period from Date of Grant     5 years      
Maximum [Member] | Restricted Stock and Restricted Stock Units [Member]            
Stock Options Exercisable Period from Date of Grant     10 years      
Share-based compensation award expiration period     10 years