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Plan's Investments at Fair Value (Detail) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value, assets, level 1 to level 2 transfers, amount $ 0    
Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value, assets, level 1 to level 2 transfers, amount 0 $ 0  
U.S. Plans | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets $ 1,090 1,074 $ 1,077
U.S. Plans | Fixed income securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actual plan asset allocations 29.00%    
U.S. Plans | Other security investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actual plan asset allocations 6.00%    
U.S. Plans | Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actual plan asset allocations 65.00%    
U.S. Plans | Fair Value, Measurements, Recurring | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets $ 1,090 1,074  
U.S. Plans | Fair Value, Measurements, Recurring | Cash equivalents | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 65 31  
U.S. Plans | Fair Value, Measurements, Recurring | Collective investment funds | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 571 540  
U.S. Plans | Fair Value, Measurements, Recurring | Corporate debt securities | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 187 197  
U.S. Plans | Fair Value, Measurements, Recurring | U.S. government-sponsored debt securities | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 30 47  
U.S. Plans | Fair Value, Measurements, Recurring | U.S. Treasury securities | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 62 75  
U.S. Plans | Fair Value, Measurements, Recurring | Asset-backed securities | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 34 39  
U.S. Plans | Fair Value, Measurements, Recurring | Equity securities | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 141 145  
U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 268 251  
U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Cash equivalents | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 65 31  
U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | U.S. Treasury securities | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 62 75  
U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Equity securities | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 141 145  
U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 788 784  
U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Collective investment funds | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 571 540  
U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 187 197  
U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | U.S. government-sponsored debt securities | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 30 47  
U.S. Plans | Fair Value, Measurements, Recurring | Level 3 | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 34 39  
U.S. Plans | Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 34 39  
Non-U.S. Plans | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets $ 436 433 $ 415
Non-U.S. Plans | Interest and Inflation Hedging Assets [Member]      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation, percentage 40.00%    
Non-U.S. Plans | Fixed income securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Actual plan asset allocations 38.00%    
Non-U.S. Plans | Other security investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation, percentage 45.00%    
Actual plan asset allocations 46.00%    
Non-U.S. Plans | Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation, percentage 15.00%    
Actual plan asset allocations 16.00%    
Non-U.S. Plans | Fair Value, Measurements, Recurring | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets $ 436 433  
Non-U.S. Plans | Fair Value, Measurements, Recurring | Cash equivalents | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 6 1  
Non-U.S. Plans | Fair Value, Measurements, Recurring | Corporate debt securities | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 39  
Non-U.S. Plans | Fair Value, Measurements, Recurring | UK Treasury securities | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 150  
Non-U.S. Plans | Fair Value, Measurements, Recurring | Asset-backed securities | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 33 32  
Non-U.S. Plans | Fair Value, Measurements, Recurring | Equity securities | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 68 134  
Non-U.S. Plans | Fair Value, Measurements, Recurring | Multi-asset securities | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [1] 329 77  
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 74 285  
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Cash equivalents | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 6 1  
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | UK Treasury securities | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 150  
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 1 | Equity securities | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 68 134  
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 329 116  
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Corporate debt securities | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 0 39  
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 2 | Multi-asset securities | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets [1] 329 77  
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 3 | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets 33 32  
Non-U.S. Plans | Fair Value, Measurements, Recurring | Level 3 | Asset-backed securities | Pension Benefits      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Fair value of plan assets $ 33 $ 32  
Minimum | U.S. Plans | Fixed income securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation, percentage 25.00%    
Minimum | U.S. Plans | Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation, percentage 50.00%    
Maximum | U.S. Plans | Fixed income securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation, percentage 35.00%    
Maximum | U.S. Plans | Other security investments      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation, percentage 7.00%    
Maximum | U.S. Plans | Equity securities      
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]      
Target allocation, percentage 80.00%    
[1] Multi-asset securities represent pension plan assets that are invested in funds comprised of broad ranges of assets.