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Stock Compensation Plans (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2017
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Stock Compensation Plans:        
Stock compensation expense $ 65 $ 63 $ 134 $ 87
Stock compensation expense recognized in merger costs $ 20 $ 145 $ 37 $ 145
Stock Option [Member]        
Stock Compensation Plans:        
Stock options granted in period (shares) 42,600 4,800,200 1,145,200 5,679,700
Unrecognized compensation cost $ 273   $ 273  
Remaining period over which to recognize unrecognized compensation expense     3 years  
Restricted Stock [Member]        
Stock Compensation Plans:        
Awards other than stock options granted in period (shares) 9,500 10,000 9,500 10,000
Unrecognized compensation cost $ 3   $ 3  
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) 9,500 597,300 277,700 845,600
Unrecognized compensation cost $ 247   $ 247  
Remaining period over which to recognize unrecognized compensation expense     2 years  
Minimum [Member] | Restricted Stock [Member]        
Stock Compensation Plans:        
Award vesting period     1 year  
Legacy Charter Awards [Member] | Stock Option [Member]        
Stock Compensation Plans:        
Award expiration period     10 years  
Legacy Charter Awards [Member] | Maximum [Member] | Stock Option [Member]        
Stock Compensation Plans:        
Award vesting period     3 years  
Legacy Charter Awards [Member] | Maximum [Member] | Restricted Stock Units [Member]        
Stock Compensation Plans:        
Award vesting period     3 years  
Legacy TWC Awards Converted May 2016 [Member] | Stock Option [Member]        
Stock Compensation Plans:        
Award vesting period     4 years  
Award expiration period     10 years  
Legacy TWC Awards Converted May 2016 [Member] | Restricted Stock Units [Member]        
Stock Compensation Plans:        
Award vesting percentage     50.00%