This item represents investments in debt securities which are categorized as held-to-maturity and that have scheduled maturities within one year of the balance sheet date or the normal operating cycle, whichever is longer; such investments are measured at amortized cost (carrying value). The held-to-maturity category is for those securities that the Entity has the positive intent and ability to hold until maturity.

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+ Details

Financial Instruments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Sep. 30, 2012	Sep. 30, 2011	Sep. 05, 2012	Aug. 30, 2011	Mar. 31, 2013 Fair Value, Inputs, Level 2	Jun. 30, 2012 Fair Value, Inputs, Level 2
Derivative
Derivative, Inception Date	Feb. 13, 2013
Notional Amount, Pay-floating interest rate swaps	$ 450			$ 350	$ 640
Derivative, Cash Received on Hedge		43	34
Held-to-maturity Securities, Current						$ 0	$ 72