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Derivative Instruments and Hedging Activities Derivative Assets and Liabilties, Offsetting (Details) - USD ($) $ in Millions	Sep. 30, 2019	Sep. 30, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross amount recognized, derivative assets	$ 97	$ 80
Gross amount eligible for offsetting, derivative assets	(11)	(12)
Net amount, derivative assets	86	68
Gross amount, derivative liabilities	2,568	3,175
Gross amount eligible for offsetting, derivative liabilities	(11)	(12)
Net Amount, derivative liabilities	$ 2,557	$ 3,163

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Fair value, after the effects of master netting arrangements, of a financial asset or other contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes assets not subject to a master netting arrangement and not elected to be offset.

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