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Stock Compensation Plans (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Stock Compensation Plans:        
Stock compensation expense $ 71 $ 64 $ 213 $ 198
Stock compensation expense recognized in merger costs   $ 6 $ 5 $ 43
Stock Option [Member]        
Stock Compensation Plans:        
Stock options granted in period (shares) 24,200 20,900 1,490,700 1,167,100
Award expiration period     10 years  
Unrecognized compensation cost $ 235   $ 235  
Remaining period over which to recognize unrecognized compensation expense     2 years  
Restricted Stock [Member]        
Stock Compensation Plans:        
Awards other than stock options granted in period (shares) 500 0 10,200 9,500
Unrecognized compensation cost $ 2   $ 2  
Remaining period over which to recognize unrecognized compensation expense     1 year  
Restricted Stock Units [Member]        
Stock Compensation Plans:        
Awards other than stock options granted in period (shares) 13,500 5,100 518,900 283,000
Unrecognized compensation cost $ 224   $ 224  
Remaining period over which to recognize unrecognized compensation expense     2 years  
Minimum [Member] | Restricted Stock [Member]        
Stock Compensation Plans:        
Award vesting period     1 year  
Maximum [Member] | Stock Option [Member]        
Stock Compensation Plans:        
Award vesting period     3 years  
Maximum [Member] | Restricted Stock Units [Member]        
Stock Compensation Plans:        
Award vesting period     3 years  
Legacy TWC Awards Converted May 2016 [Member] | Restricted Stock Units [Member]        
Stock Compensation Plans:        
Award vesting percentage     50.00%