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Fair Value Measurements - Equity Method Investments, Summarized Financial Information (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2012
Equity Method Investments and Joint Ventures [Abstract]
Revenue	$ 239	$ 148	$ 144
Net investment income	161	88	(19)
Net income	216	135	36
Total assets	25,497	741
Total liabilities	24,209	136
Non controlling interests	$ 14	$ 3

The amount of assets reported by an equity method investment of the entity.

The amount of liabilities reported by an equity method investment of the entity.

Amount of equity attributable to noncontrolling interests of an equity method investment of the entity.

The amount of net income (loss) reported by an equity method investment of the entity.