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Noncontrolling Interests (Notes)
 6 Months Ended
Jun. 30, 2018
Noncontrolling Interests [Abstract]  
Noncontrolling Interests
Noncontrolling Interests

Noncontrolling interests represents consolidated subsidiaries of which the Company owns less than 100%. The Company is a holding company whose principal asset is a controlling equity interest in Charter Holdings, the indirect owner of the Company’s cable systems. Noncontrolling interests on the Company’s balance sheet primarily includes Advance/Newhouse Partnership's (“A/N”) equity interests in Charter Holdings, which is comprised of a common ownership interest and a convertible preferred ownership interest.

Net income of Charter Holdings attributable to A/N’s common noncontrolling interest for financial reporting purposes is based on the effective common ownership interest of approximately 8% during 2018 and 10% during 2017, and was $28 million and $45 million for the three and six months ended June 30, 2018, respectively, and $18 million and $36 million for the three and six months ended June 30, 2017, respectively. Net income of Charter Holdings attributable to the preferred noncontrolling interest for financial reporting purposes is based on the preferred dividend which was $37 million and $75 million for each of the three and six months ended June 30, 2018 and 2017, respectively.

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
)


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