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Earnings Per Share - Earnings Per Share (Detail) - USD ($)
shares in Millions, $ in Millions
3 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Earnings Per Share [Abstract]    
Income from continuing operations $ 230 $ 372
Loss from discontinued operations 0 (43)
Basic and diluted income available to shareholders $ 230 $ 329
Weighted Average Shares Outstanding    
Basic weighted average shares outstanding 926.1 937.2
Effect of dilutive securities:    
Stock options, unvested restricted stock and unvested performance share awards 7.2 10.2
Diluted weighted average shares outstanding 933.3 947.4
Antidilutive Securities    
Options to purchase shares 1.0 0.1