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CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY (Parenthetical) (USD $)
In Millions, except Per Share data, unless otherwise specified
 3 Months Ended
Dec. 31, 2014
Class A common stock | Common Stock  
Restricted stock and performance-based shares settled in cash for taxes (in shares, less than 1 million) 1us-gaap_StockIssuedDuringPeriodSharesRestrictedStockAwardGross
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 [1]
Restricted stock instruments settled in cash for taxes shares (in shares, less than 1 million) 1v_RestrictedStockInstrumentsSettledInCashForTaxesShares
/ us-gaap_StatementClassOfStockAxis
= us-gaap_CommonClassAMember
/ us-gaap_StatementEquityComponentsAxis
= us-gaap_CommonStockMember		 [2]
[1] Increase in class A common stock is less than 1 million shares.
[2] Decrease in class A common stock is less than 1 million shares.