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Stock Compensation Plans (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Stock Compensation Plans:        
Stock compensation expense $ 70 $ 65 $ 142 $ 134
Stock compensation expense recognized in merger costs   $ 20 $ 5 $ 37
Stock Option [Member]        
Stock Compensation Plans:        
Stock options granted in period (shares) 36,700 42,600 1,466,500 1,145,200
Award expiration period     10 years  
Unrecognized compensation cost $ 271   $ 271  
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) 9,700 9,500 9,700 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) 21,700 9,500 505,400 277,700
Unrecognized compensation cost $ 260   $ 260  
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%