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Share-based Compensation (Awards Outstanding and Exercisable) (Details)	Mar. 31, 2019 $ / shares shares
Held by Liberty Global employees: | Options and SARs | Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	20,043,088
Options outstanding, weighted average exercise or base price (in dollars per shares) | $ / shares	$ 30.89
Options exercisable (in shares)	10,666,743
Options exercisable, weighted average exercise price or base price (in dollars per shares) | $ / shares	$ 32.38
Held by Liberty Global employees: | Options and SARs | Class C
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	45,104,300
Options outstanding, weighted average exercise or base price (in dollars per shares) | $ / shares	$ 29.32
Options exercisable (in shares)	26,167,940
Options exercisable, weighted average exercise price or base price (in dollars per shares) | $ / shares	$ 30.04
Held by Liberty Global employees: | RSUs | Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options outstanding (in shares)	1,929,071
Held by Liberty Global employees: | RSUs | Class B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options outstanding (in shares)	52,622
Held by Liberty Global employees: | RSUs | Class C
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options outstanding (in shares)	3,644,793
Held by Liberty Global employees: | PSUs | Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options outstanding (in shares)	7,853
Held by Liberty Global employees: | PSUs | Class B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options outstanding (in shares)	0
Held by Liberty Global employees: | PSUs | Class C
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options outstanding (in shares)	15,702
Held by former Liberty Global employees: | Options and SARs | Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	1,197,485
Options outstanding, weighted average exercise or base price (in dollars per shares) | $ / shares	$ 33.05
Options exercisable (in shares)	1,042,746
Options exercisable, weighted average exercise price or base price (in dollars per shares) | $ / shares	$ 32.75
Held by former Liberty Global employees: | Options and SARs | Class C
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Options outstanding (in shares)	2,793,323
Options outstanding, weighted average exercise or base price (in dollars per shares) | $ / shares	$ 30.89
Options exercisable (in shares)	2,483,449
Options exercisable, weighted average exercise price or base price (in dollars per shares) | $ / shares	$ 30.50
Held by former Liberty Global employees: | RSUs | Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options outstanding (in shares)	2,576,197
Held by former Liberty Global employees: | RSUs | Class B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options outstanding (in shares)	0
Held by former Liberty Global employees: | RSUs | Class C
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options outstanding (in shares)	5,156,515
Held by former Liberty Global employees: | PSUs | Class A
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options outstanding (in shares)	146,023
Held by former Liberty Global employees: | PSUs | Class B
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options outstanding (in shares)	0
Held by former Liberty Global employees: | PSUs | Class C
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Other than options outstanding (in shares)	292,381

X

- Definition

The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (c)(2)(i)-(ii)
-URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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The weighted-average price as of the balance sheet date at which grantees can acquire the shares reserved for issuance on vested portions of options outstanding and currently exercisable under the stock option plan.

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