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Noncontrolling Interest (Tables)
 6 Months Ended
Jun. 30, 2018
Noncontrolling Interest [Abstract]  
Schedule of Noncontrolling Interest Purchased
The following table represents Charter Holdings' purchase of Charter Holdings common units from A/N pursuant to the Letter Agreement (see Note 13) and the effect on total shareholders' equity during the three and six months ended June 30, 2018 and 2017.

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Number of units purchased
681,553

 
1,232,029

 
1,051,028

 
1,315,445

Average price per unit
$
295.31

 
$
326.50

 
$
312.38

 
$
326.38

Amount of units purchased
$
201

 
$
402

 
$
328

 
$
429

Decrease in noncontrolling interest based on carrying value
$
(164
)
 
$
(271
)
 
$
(254
)
 
$
(290
)
Decrease in additional paid-in-capital, net of tax
$
(28
)
 
$
(81
)
 
$
(56
)
 
$
(86
)
Schedule of effects on statement of shareholders' equity due to ownership changes
Total shareholders' equity was also adjusted during the three and six months ended June 30, 2018 and 2017 due to the changes in Charter Holdings' ownership as follows.

 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
2018
 
2017
 
2018
 
2017
Decrease in noncontrolling interest
$
(23
)
 
$
(123
)
 
$
(43
)
 
$
(166
)
Increase in additional paid-in-capital, net of tax
$
18

 
$
75

 
$
32

 
$
102