Income Taxes (Unrecognized Tax Benefits) (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended	12 Months Ended
Dec. 31, 2012	Jun. 30, 2012	Jun. 30, 2011
Income Taxes [Abstract]
Beginning balance	$ 80	$ 79	$ 84
Additions related to current years' tax positions			4
Additions related to prior years' tax positions	6	26
Reductions related to prior years' tax positions	(1)	(21)	(7)
Reductions due to lapse of statue of limitations	(1)
Settlements with tax authorities	(7)	(4)	(2)
Ending balance	$ 77	$ 80	$ 79

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The gross amount of unrecognized tax benefits pertaining to uncertain tax positions taken in tax returns as of the balance sheet date.

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The gross amount of decreases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from settlements with taxing authorities.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions that have been or will be taken in the tax return for the current period, excluding amounts pertaining to examined tax returns.

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The gross amount of increases in unrecognized tax benefits resulting from tax positions taken in prior period tax returns, excluding amounts pertaining to examined tax returns.

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The gross amount of decreases in unrecognized tax benefits resulting from lapses of the applicable statutes of limitations.

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