Stock-based Compensation (Tables)

12 Months Ended

Sep. 30, 2017

Share-based Compensation Arrangement by Share-based Payment Award [Line Items]

Schedule of share-based payment award, performance share, valuation assumptions [Table Text Block]

	Year Ended September 30, 2017
Risk-free interest rate	1.40%
Expected volatility of the Company's stock	21.00%

Assumptions Used in Black-Scholes Option Valuation Model

	Year Ended September 30,
	2017	2016	2015
Expected life of option (years)	4.75 & 6.5	6.4	6.6
Risk-free interest rate	1.23% - 1.93%	1.64% - 1.70%	1.61% - 1.93%
Expected volatility of the Company’s stock	24.60%	36.00%	36.00%
Expected dividend yield on the Company’s stock	2.21%	2.11%	2.02%

Summary of Stock Option Activity

A summary of stock option activity at September 30, 2017, and changes for the year then ended, is presented below:

	Weighted Average Option Price		Shares Subject to Option		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value (in millions)
Outstanding, September 30, 2016	$	32.07	22,332,233
Spin conversion	31.02		1,547,096
Granted	41.73		2,841,686
Exercised	28.33		(5,919,790	)
Forfeited or expired	42.33		(1,070,782	)
Outstanding, September 30, 2017	$	32.76	19,730,443		4.9	$	187
Exercisable, September 30, 2017	$	33.16	15,054,034		4.0	$	180

Assumptions Used in Black-Scholes Stock Appreciation Rights Valuation Model

The assumptions used to determine the fair value of the SAR awards at September 30, 2017 were as follows:

Expected life of SAR (years)	0.5 - 5.5
Risk-free interest rate	1.06% - 1.98%
Expected volatility of the Company’s stock	24.60%
Expected dividend yield on the Company’s stock	2.21%

Summary of Stock Appreciation Rights Activity

A summary of SAR activity at September 30, 2017, and changes for the year then ended, is presented below:

	Weighted Average SAR Price		Shares Subject to SAR		Weighted Average Remaining Contractual Life (years)	Aggregate Intrinsic Value (in millions)
Outstanding, September 30, 2016	$	30.49	1,201,165
Spin conversion	28.06		29,241
Granted	41.73		15,693
Exercised	29.62		(290,378	)
Forfeited or expired	39.17		(62,410	)
Outstanding, September 30, 2017	$	27.02	893,311		3.8	$	12
Exercisable, September 30, 2017	$	26.40	853,260		3.5	$	12

Summary of Nonvested Restricted Stock Awards

A summary of the status of the Company’s nonvested restricted stock awards at September 30, 2017, and changes for the fiscal year then ended, is presented below:

	Weighted Average Price		Shares/Units Subject to Restriction
Nonvested, September 30, 2016	$	47.27	9,566,044
Spin conversion	43.88		482,312
Granted	41.66		1,773,465
Vested	40.83		(3,045,375	)
Forfeited	44.53		(1,814,740	)
Nonvested, September 30, 2017	$	44.48	6,961,706

Summary of Nonvested PSUs

A summary of the status of the Company’s nonvested PSUs at September 30, 2017, and changes for the fiscal year then ended, is presented below:

	Weighted Average Price		Shares/Units Subject to PSU
Nonvested, September 30, 2016	$	—	—
Granted	43.43		1,259,342
Forfeited	44.98		(139,954	)
Nonvested, September 30, 2017	$	43.24	1,119,388