Goodwill and Intangible Assets (Details) (USD $) In Millions, unless otherwise specified			3 Months Ended
	Jun. 30, 2014	Sep. 30, 2013	Jun. 30, 2014 Previously Held Minority Interest Ownership [Member]	Apr. 30, 2014 Previously Held Minority Interest Ownership [Member]
Business Acquisition [Line Items]
Total purchase consideration			$ 170
Indefinite-lived intangible assets acquired			126
Goodwill	$ 11,741	$ 11,681		$ 60