Summary of Significant Accounting Policies (Details 2) - shares shares in Millions	6 Months Ended	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Liberty Global Group [Member] | Stock Options, SARs, PSARs, Restricted Shares, and RSUs [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Aggregate number of shares excluded from computation of EPS			43.3
Liberty Global Group [Member] | Performance shares (PSUs and PGUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Aggregate number of shares excluded from computation of EPS			4.5
Liberty Global Group [Member] | Obligations That May Be Settled in Cash or Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Aggregate number of shares excluded from computation of EPS			2.7
LiLAC Group [Member] | Stock Options, SARs, PSARs, Restricted Shares, and RSUs [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Aggregate number of shares excluded from computation of EPS		7.5
LiLAC Group [Member] | Performance shares (PSUs and PGUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Aggregate number of shares excluded from computation of EPS		1.1
Old Liberty Global [Member] | Stock Options, SARs, PSARs, Restricted Shares, and RSUs [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Aggregate number of shares excluded from computation of EPS	42.1			39.1
Old Liberty Global [Member] | Performance shares (PSUs and PGUs)
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Aggregate number of shares excluded from computation of EPS	5.3			5.4
Old Liberty Global [Member] | Obligations That May Be Settled in Cash or Shares [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Aggregate number of shares excluded from computation of EPS	2.6			2.6