Commitments and Contingencies (Details) $ in Millions	Dec. 31, 2018 USD ($)
Commitments and Contingencies Disclosure [Abstract]
Recorded liability for lease indemnifications	$ 137

Aggregate liability recorded as of the balance sheet date related to indemnification obligations with respect to leases associated with previously discontinued operations.

No definition available.

Name:	viab_LiabilityRelatedToIndemnificationObligations
Namespace Prefix:	viab_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant