Commitments And Contingencies (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended		1 Months Ended
	Mar. 31, 2014	Sep. 30, 2014	Jul. 31, 2011 Convertible Debt	Sep. 30, 2014 Convertible Debt	Jul. 14, 2011 Convertible Debt	Sep. 30, 2014 Convertible Notes Interest [Member]
Loss Contingencies [Line Items]
Operating Leases, Future Minimum Payments Due, Future Minimum Sublease Rentals		$ 6
Long-term Debt, Gross	633	633		633
Debt Instrument, Unamortized Discount (Premium), Net	53	42
Contractual interest rate of 0.75% Convertible Senior Notes due 2016					0.75%
Debt Instrument, Maturity Date, Description			2016
Debt Instrument, Maturity Date			Jul. 15, 2016
Other Accrued Liabilities, Current	328	386				1
Amount of potential cash payments that could result from unrecognized tax benefits		89
Maximum potential payout of acquisition-related contingent consideration	10	3
Litigation Settlement, Amount	$ 30