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Risk Management Activities and Derivative Transactions Risk Management Activities and Derivative Transactions - Derivative Instruments That Receive Hedge Accounting Treatment (Details) - USD ($)	12 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2017
Summary of Derivative Instruments That Receive Hedge Accounting Treatment
Interest rate swaps	$ 1,764,000,000	$ 1,199,000,000
Net unrealized gain (loss) on future cash flow hedges	(114,000,000)	10,000,000	$ 59,000,000
Reclassification to earnings from cash flow hedges	(45,000,000)	26,000,000	$ (26,000,000)
Ineffective portion excluded from testing	0
Derivative Instruments, Gain (Loss) Reclassification from Accumulated OCI to Income, Estimated Net Amount to be Transferred	30,000,000
Accounts payable and accrued liabilities
Summary of Derivative Instruments That Receive Hedge Accounting Treatment
Interest rate swaps	$ 88,000,000	$ 77,000,000

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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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The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

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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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