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Derivative Instruments and Hedging Activities - Derivative Assets and Liabilities Offsetting (Details) - USD ($) $ in Millions	Sep. 30, 2020	Sep. 30, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gross amount recognized, asset	$ 5	$ 23
Gross amount eligible for offsetting, asset	(5)	(9)
Net amount, asset	0	14
Gross amount recognized, liability	1,213	1,109
Gross amount eligible for offsetting, liability	(5)	(9)
Net amount, liability	$ 1,208	$ 1,100

X

- Definition

Amount of obligation to return cash collateral under master netting arrangements offset against derivative assets.

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Fair value, before 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 elected not to be offset. Excludes assets not subject to a master netting arrangement.

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Fair value, after offset of derivative liability, of 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, before offset against an obligation to return collateral under a master netting arrangement. Includes assets elected not to be offset. Excludes assets not subject to a master netting arrangement.

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No definition available.

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Amount of right to receive cash collateral under master netting arrangements offset against derivative liabilities.

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