Business Combinations (Fair Value Of Assets Acquired And Liabilities Assumed) (Details) (Katz Group [Member], USD $) In Millions, unless otherwise specified	Mar. 31, 2012 Amounts Previously Recognized As Of Acquisition Date (Provisional) [Member]		Sep. 30, 2012 Purchase Price Allocation Adjustments [Member]	Sep. 30, 2012 Amounts Recognized As Of Acquisition Date As Adjusted [Member]
Business Acquisition [Line Items]
Current assets, net of cash acquired	$ 33	[1]	$ (1)	$ 32
Goodwill	506	[1]	6	512
Intangible assets	441	[1]	1	442
Other long-term assets	15	[1]	(1)	14
Current liabilities	(37)	[1]	1	(36)
Long-term deferred tax liabilities	(39)	[1]	0	(39)
Purchase Price, Less Cash and Cash Equivalents	$ 919	[1]	$ 6	$ 925

[1] As previously reported in our Form 10-K for the year ended March 31, 2012.