Debt and Financing Arrangements Notes Payable to Affiliates (Tables)

12 Months Ended

Sep. 30, 2016

Debt Instrument [Line Items]

Notes Payable to Affiliates [Table Text Block]

	September 30,
	2016		2015
Affiliate notes
5.0% due in 2021 ($500 million principal amount)	$	500	$	—
5.0% due in 2021 ($500 million principal amount)	500		—
5.2% due in 2022 ($1,000 million principal amount)	1,000		—
5.4% due in 2023 ($2,000 million principal amount)	2,000		—
6.0% due in 2026 ($2,500 million principal amount)	2,500		—
Affiliate notes payable	$	6,500	$	—