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Earnings Per Share - Earnings Per Share (Detail) - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Earnings Per Share [Abstract]
Income from continuing operations	$ 555	$ 347	$ 779	$ 845
Income (loss) from discontinued operations	0	36	(43)	(542)
Basic and diluted income available to shareholders	$ 555	$ 383	$ 736	$ 303
Weighted Average Shares Outstanding
Basic weighted average shares outstanding	935.4	644.9	937.2	647.0
Effect of dilutive securities:
Stock options, unvested restricted stock and unvested performance share awards	9.0	4.8	9.6	4.5
Diluted weighted average shares outstanding	944.4	649.7	946.8	651.5
Antidilutive Securities
Options to purchase shares	0.1	0.1	0.1	0.2

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Antidilutive securities.

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Effect Of Dilutive Securities [Abstract]

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Amount after tax of income (loss) from continuing operations attributable to the parent.

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Additional shares included in the calculation of diluted EPS as a result of the potentially dilutive effect of share based payment arrangements using the treasury stock method.

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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.

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