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Number of Shares of Class A Common Shares Outstanding on an As-Converted Basis (Detail)
In Millions, unless otherwise specified
Dec. 31, 2014
Sep. 30, 2014
Schedule of Common Stock as Converted [Line Items]    
As-converted Class A Common Stock 616v_SharesOutstandingAsConvertedBasis [1]  
Class A common stock    
Schedule of Common Stock as Converted [Line Items]    
Shares Outstanding 495us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 495us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
As-converted Class A Common Stock 495v_SharesOutstandingAsConvertedBasis
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember		 [1]  
Class B common stock    
Schedule of Common Stock as Converted [Line Items]    
Shares Outstanding 245us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 245us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember
Conversion Rate Into Class A Common Stock 0.4121v_CommonStockConversionRate
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 [2]  
As-converted Class A Common Stock 101v_SharesOutstandingAsConvertedBasis
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassBMember		 [1]  
Class C common stock    
Schedule of Common Stock as Converted [Line Items]    
Shares Outstanding 20us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember		 22us-gaap_CommonStockSharesOutstanding
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember
Conversion Rate Into Class A Common Stock 1.0000v_CommonStockConversionRate
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember		  
As-converted Class A Common Stock 20v_SharesOutstandingAsConvertedBasis
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassCMember		 [1]  
[1] Figures in the table may not recalculate exactly due to rounding. As-converted class A common stock is calculated based on unrounded numbers.
[2] The class B to class A common stock conversion rate has been rounded for purposes of this disclosure. Conversion calculations for dividend payments are based on a conversion rate rounded to the tenth decimal.