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Subsequent Events (Details) (USD $)	0 Months Ended
	Jan. 28, 2015	Dec. 31, 2014		Jan. 27, 2015	Mar. 18, 2015
Line of Credit Facility [Line Items]
As-converted Class A Common Stock		616,000,000v_SharesOutstandingAsConvertedBasis	[1]
Subsequent Event
Line of Credit Facility [Line Items]
As-converted Class A Common Stock	2,500,000,000v_SharesOutstandingAsConvertedBasis / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember			614,000,000v_SharesOutstandingAsConvertedBasis / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Dividends Payable, Amount Per Share (in USD per Share)	$ 0.48us-gaap_DividendsPayableAmountPerShare / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Revolving Credit Facility
Line of Credit Facility [Line Items]
Credit facility maximum borrowing capacity		3,000,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember
Revolving Credit Facility | Subsequent Event
Line of Credit Facility [Line Items]
Term of line of credit facility	364 days
Credit facility maximum borrowing capacity	3,000,000,000.0us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Consolidated indebtedness to consolidated EBITA	$ 3.75v_DebtInstrumentCovenantConsolidatedIndebtednesstoConsolidatedEBITA / us-gaap_CreditFacilityAxis = us-gaap_RevolvingCreditFacilityMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Class A common stock
Line of Credit Facility [Line Items]
As-converted Class A Common Stock		495,000,000v_SharesOutstandingAsConvertedBasis / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember	[1]
Class A common stock | Subsequent Event
Line of Credit Facility [Line Items]
Stockholders' Equity Note, Stock Split, Conversion Ratio	4us-gaap_StockholdersEquityNoteStockSplitConversionRatio1 / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassAMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Class B common stock
Line of Credit Facility [Line Items]
As-converted Class A Common Stock		101,000,000v_SharesOutstandingAsConvertedBasis / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember	[1]
Class B common stock | Subsequent Event
Line of Credit Facility [Line Items]
Common Stock, Shares Issued Upon Conversion					1.6483v_CommonStockSharesIssuedUponConversion / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassBMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
Class C common stock
Line of Credit Facility [Line Items]
As-converted Class A Common Stock		20,000,000v_SharesOutstandingAsConvertedBasis / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassCMember	[1]
Class C common stock | Subsequent Event
Line of Credit Facility [Line Items]
Common Stock, Shares Issued Upon Conversion					4.0v_CommonStockSharesIssuedUponConversion / us-gaap_StatementClassOfStockAxis = us-gaap_CommonClassCMember / us-gaap_SubsequentEventTypeAxis = us-gaap_SubsequentEventMember
[1] Figures in the table may not recalculate exactly due to rounding. As-converted class A common stock is calculated based on unrounded numbers.

X

- Definition

The per share amount of a dividend declared, but not paid, as of the financial reporting date.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 50

-Paragraph 3

-URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586

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- Definition

Period remaining on line of credit facility before it terminates, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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X

- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 210

-SubTopic 10

-Section S99

-Paragraph 1

-Subparagraph (SX 210.5-02.19(b),22(b))

-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682



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-Section 02

-Paragraph 19, 22

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X

- Definition

Ratio applied to the conversion of stock split, for example but not limited to, one share converted to two or two shares converted to one.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Stock Split

-URI http://asc.fasb.org/extlink&oid=6525746



Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 505

-SubTopic 10

-Section S99

-Paragraph 4

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- Definition

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+ References

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- Definition

Debt Instrument, Covenant, Consolidated Indebtedness to Consolidated EBITA

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- Definition

Shares Outstanding As Converted Basis

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