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Proprietary Capital - Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2017	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2018
Accumulated Other Comprehensive Income (Loss)
Net effect on earnings	$ 0	$ 0
Net unrealized gain (loss) on future cash flow hedges		(1)	$ (114)	$ 10
Reclassification to earnings from cash flow hedges		38	$ 45	$ 26
Reclassification to earnings from cash flow hedges in the next twelve months		$ (27)

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The net effect on earnings resulting from the combination of amounts reclassified from other comprehensive income to earnings as well as the exchange gain/loss on debt.

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The estimated value of gains (losses), net anticipated to be transferred in the future from accumulated other comprehensive income into earnings.

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Amount after tax of reclassification adjustment from accumulated other comprehensive income of accumulated gain (loss) realized from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's deferred hedging gain (loss).

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Amount after tax of increase (decrease) in accumulated gain (loss) from derivative instruments designated and qualifying as the effective portion of cash flow hedges and an entity's share of an equity investee's increase (decrease) in deferred hedging gain (loss).

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