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Investment Income, Net (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Fair Value Measurements and Investments [Abstract]
Interest and dividend income on cash and investments	$ 75	$ 31	$ 25
Gain on other investments	5	3	8
Investment securities, trading:
Unrealized gains (losses), net	3	(6)	(2)
Realized gains (losses), net		2	6
Investment securities, available-for-sale:
Realized gains, net	3	21	1
Other-than-temporary impairment on investments	(4)	(5)	(3)
Investment income	$ 82	$ 46	$ 35

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This item represents the difference between the gross realized gains and losses realized on the sale of debt or equity securities categorized neither as held-to-maturity nor trading securities. Additionally, this item would include any losses recognized for other than temporary impairments (OTTI) of the subject investments in debt and equity securities.

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This item represents the gain (loss) realized during the period from the sale of investments accounted for under the cost method of accounting and any losses recognized thereon for impairments of other than a temporary nature.

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Amount after accretion (amortization) of discount (premium), and investment expense, of interest income and dividend income on nonoperating securities.

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Disclosure - Fair Value Measurements and Investments [Abstract]

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Other-than-temporary impairment losses realized

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