Amount of contributions made by the employer to defined benefit plans.

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The effect of a one-percentage-point increase in the assumed health care cost trend rates on the accumulated postretirement benefit obligation for health care benefits.

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The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status.

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The amount of net gain (loss) recognized in net periodic benefit cost as a result of an event that significantly reduces the expected years of future service of present employees or eliminates for a significant number of employees the accrual of defined benefits for some or all of their future services.

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Target allocation maximum percentage of investments of this type to total plan assets presented on a weighted average basis.

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Target allocation minimum percentage of investments of this type to total plan assets presented on a weighted average basis.

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The ultimate trend rate for health care costs.

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Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held.

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The amount of the cost recognized during the period for defined contribution plans.

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Tabular disclosure of the effect of a one-percentage-point increase and the effect of a one-percentage-point decrease in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs and the accumulated postretirement benefit obligation for health care benefits.

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Defined Benefit Plan Contribution Percent Of Compensation

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Defined Benefit Plan, Postretirement Benefit Termination Age

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Pension, Postretirement and Other Benefits - Additional Information (Detail) - USD ($) $ in Millions	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Postretirement benefit plan, age when benefits terminate	65 years
Assumed annual rate of future increases in health benefits for the other postretirement benefits plan for fiscal 2011	8.00%
Assumed annual rate of future decreases in health benefits for the other postretirement benefits plan by 2017	5.00%
Schedule of Effect of One-Percentage-Point Change in Assumed Health Care Cost Trend Rates [Table Text Block]	0.01
Increasing or decreasing the healthcare cost trend by one per cent would increase decrease the postretirement accumulated plan benefit obligation by less than	$ 1
Defined contribution plan, personnel costs	$ 55	$ 49	$ 46
U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Cash balance formula contributions, rate of eligible compensation	6.00%
Curtailment gain recognized	$ 8
Company contribution	$ 1	16
U.S. Plans \| Equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocation for plan assets, equity securities, minimum	50.00%
Target allocation for plan assets, equity securities, maximum	80.00%
Plan asset allocation, equity securities	62.00%
U.S. Plans \| Fixed income securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocation for plan assets, equity securities, minimum	25.00%
Target allocation for plan assets, equity securities, maximum	35.00%
Plan asset allocation, equity securities	34.00%
U.S. Plans \| Other Security Investments [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocation for plan assets, equity securities, maximum	7.00%
Plan asset allocation, equity securities	4.00%
Non-U.S. Plans
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Company contribution	$ 102	$ 0
Non-U.S. Plans \| Equity securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocation for plan assets, equity securities, maximum	40.00%
Plan asset allocation, equity securities	28.00%
Non-U.S. Plans \| Fixed income securities
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocation for plan assets, equity securities, maximum	20.00%
Plan asset allocation, equity securities	22.00%
Non-U.S. Plans \| Other Security Investments [Member]
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Target allocation for plan assets, equity securities, maximum	40.00%
Plan asset allocation, equity securities	50.00%