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Plan Assets by Asset Category (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2016
Postretirement Benefits      
Retirement Plans [Line Items]      
Fair value of plan assets $ 174 $ 177 $ 196
Postretirement Benefits | Cash      
Retirement Plans [Line Items]      
Fair value of plan assets 13 3  
Postretirement Benefits | Large-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 26 28  
Postretirement Benefits | Small-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 8 9  
Postretirement Benefits | International-Developed      
Retirement Plans [Line Items]      
Fair value of plan assets 20 21  
Postretirement Benefits | International - Emerging      
Retirement Plans [Line Items]      
Fair value of plan assets 9 11  
Postretirement Benefits | Government      
Retirement Plans [Line Items]      
Fair value of plan assets 20 21  
Postretirement Benefits | Corporate/Other      
Retirement Plans [Line Items]      
Fair value of plan assets 55 59  
Postretirement Benefits | Commodities      
Retirement Plans [Line Items]      
Fair value of plan assets 14 15  
Postretirement Benefits | Real Estate      
Retirement Plans [Line Items]      
Fair value of plan assets 9 10  
Fair Value, Inputs, Level 1 | Postretirement Benefits      
Retirement Plans [Line Items]      
Fair value of plan assets 13 0  
Fair Value, Inputs, Level 1 | Postretirement Benefits | Cash      
Retirement Plans [Line Items]      
Fair value of plan assets 13 0  
Fair Value, Inputs, Level 1 | Postretirement Benefits | Large-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 1 | Postretirement Benefits | Small-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 1 | Postretirement Benefits | International-Developed      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 1 | Postretirement Benefits | International - Emerging      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 1 | Postretirement Benefits | Government      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 1 | Postretirement Benefits | Corporate/Other      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 1 | Postretirement Benefits | Commodities      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 1 | Postretirement Benefits | Real Estate      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Significant Other Observable Inputs (Level 2) | Postretirement Benefits      
Retirement Plans [Line Items]      
Fair value of plan assets 161 177  
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Cash      
Retirement Plans [Line Items]      
Fair value of plan assets 0 3  
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Large-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 26 28  
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Small-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 8 9  
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | International-Developed      
Retirement Plans [Line Items]      
Fair value of plan assets 20 21  
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | International - Emerging      
Retirement Plans [Line Items]      
Fair value of plan assets 9 11  
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Government      
Retirement Plans [Line Items]      
Fair value of plan assets 20 21  
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Corporate/Other      
Retirement Plans [Line Items]      
Fair value of plan assets 55 59  
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Commodities      
Retirement Plans [Line Items]      
Fair value of plan assets 14 15  
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Real Estate      
Retirement Plans [Line Items]      
Fair value of plan assets 9 10  
Fair Value, Inputs, Level 3 | Postretirement Benefits      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 3 | Postretirement Benefits | Cash      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 3 | Postretirement Benefits | Large-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 3 | Postretirement Benefits | Small-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 3 | Postretirement Benefits | International-Developed      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 3 | Postretirement Benefits | International - Emerging      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 3 | Postretirement Benefits | Government      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 3 | Postretirement Benefits | Corporate/Other      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 3 | Postretirement Benefits | Commodities      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Fair Value, Inputs, Level 3 | Postretirement Benefits | Real Estate      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
UNITED STATES | Pension Plan [Member]      
Retirement Plans [Line Items]      
Fair value of plan assets 3,046 3,165 3,293
UNITED STATES | Pension Plan [Member] | Cash      
Retirement Plans [Line Items]      
Fair value of plan assets 23 70  
UNITED STATES | Pension Plan [Member] | Large-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 430 652  
UNITED STATES | Pension Plan [Member] | Small-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 282 281  
UNITED STATES | Pension Plan [Member] | International-Developed      
Retirement Plans [Line Items]      
Fair value of plan assets 411 649  
UNITED STATES | Pension Plan [Member] | International - Emerging      
Retirement Plans [Line Items]      
Fair value of plan assets 94 51  
UNITED STATES | Pension Plan [Member] | Government      
Retirement Plans [Line Items]      
Fair value of plan assets 333 270  
UNITED STATES | Pension Plan [Member] | Corporate/Other      
Retirement Plans [Line Items]      
Fair value of plan assets 1,183 917  
UNITED STATES | Pension Plan [Member] | Real Estate      
Retirement Plans [Line Items]      
Defined Benefit Plan, Investment Funds Measured At Net Asset Value 290 275  
UNITED STATES | Pension Plan [Member] | Total Plan Assets Excluding Plan Assets Measured Using NAV Practical Expedient [Member]      
Retirement Plans [Line Items]      
Fair value of plan assets 2,756 2,890  
UNITED STATES | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Cash      
Retirement Plans [Line Items]      
Fair value of plan assets 2 2  
UNITED STATES | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Large-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 309 375  
UNITED STATES | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Small-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 282 281  
UNITED STATES | Fair Value, Inputs, Level 1 | Pension Plan [Member] | International-Developed      
Retirement Plans [Line Items]      
Fair value of plan assets 365 569  
UNITED STATES | Fair Value, Inputs, Level 1 | Pension Plan [Member] | International - Emerging      
Retirement Plans [Line Items]      
Fair value of plan assets 80 24  
UNITED STATES | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Government      
Retirement Plans [Line Items]      
Fair value of plan assets 307 243  
UNITED STATES | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Corporate/Other      
Retirement Plans [Line Items]      
Fair value of plan assets 1,119 851  
UNITED STATES | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Total Plan Assets Excluding Plan Assets Measured Using NAV Practical Expedient [Member]      
Retirement Plans [Line Items]      
Fair value of plan assets 2,464 2,345  
UNITED STATES | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Cash      
Retirement Plans [Line Items]      
Fair value of plan assets 21 68  
UNITED STATES | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Large-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 121 277  
UNITED STATES | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Small-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
UNITED STATES | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | International-Developed      
Retirement Plans [Line Items]      
Fair value of plan assets 46 80  
UNITED STATES | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | International - Emerging      
Retirement Plans [Line Items]      
Fair value of plan assets 14 27  
UNITED STATES | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Government      
Retirement Plans [Line Items]      
Fair value of plan assets 26 27  
UNITED STATES | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Corporate/Other      
Retirement Plans [Line Items]      
Fair value of plan assets 64 66  
UNITED STATES | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Total Plan Assets Excluding Plan Assets Measured Using NAV Practical Expedient [Member]      
Retirement Plans [Line Items]      
Fair value of plan assets 292 545  
UNITED STATES | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Cash      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
UNITED STATES | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Large-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
UNITED STATES | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Small-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
UNITED STATES | Fair Value, Inputs, Level 3 | Pension Plan [Member] | International-Developed      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
UNITED STATES | Fair Value, Inputs, Level 3 | Pension Plan [Member] | International - Emerging      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
UNITED STATES | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Government      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
UNITED STATES | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Corporate/Other      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
UNITED STATES | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Total Plan Assets Excluding Plan Assets Measured Using NAV Practical Expedient [Member]      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Non-US [Member] | Pension Plan [Member]      
Retirement Plans [Line Items]      
Fair value of plan assets 2,117 2,181 $ 2,536
Non-US [Member] | Pension Plan [Member] | Cash      
Retirement Plans [Line Items]      
Fair value of plan assets 44 55  
Non-US [Member] | Pension Plan [Member] | Large-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 235 242  
Non-US [Member] | Pension Plan [Member] | Mid Cap [Member]      
Retirement Plans [Line Items]      
Fair value of plan assets   2  
Non-US [Member] | Pension Plan [Member] | International-Developed      
Retirement Plans [Line Items]      
Fair value of plan assets 319 517  
Non-US [Member] | Pension Plan [Member] | International - Emerging      
Retirement Plans [Line Items]      
Fair value of plan assets 15 13  
Non-US [Member] | Pension Plan [Member] | Government      
Retirement Plans [Line Items]      
Fair value of plan assets 830 618  
Non-US [Member] | Pension Plan [Member] | Corporate/Other      
Retirement Plans [Line Items]      
Fair value of plan assets 545 569  
Non-US [Member] | Pension Plan [Member] | Hedge Funds      
Retirement Plans [Line Items]      
Fair value of plan assets 82 112  
Non-US [Member] | Pension Plan [Member] | Real Estate      
Retirement Plans [Line Items]      
Fair value of plan assets 26 24  
Defined Benefit Plan, Investment Funds Measured At Net Asset Value 21 29  
Non-US [Member] | Pension Plan [Member] | Total Plan Assets Excluding Plan Assets Measured Using NAV Practical Expedient [Member]      
Retirement Plans [Line Items]      
Fair value of plan assets 2,096 2,152  
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Cash      
Retirement Plans [Line Items]      
Fair value of plan assets 43 45  
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Large-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 24 18  
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Mid Cap [Member]      
Retirement Plans [Line Items]      
Fair value of plan assets   2  
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | International-Developed      
Retirement Plans [Line Items]      
Fair value of plan assets 59 58  
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | International - Emerging      
Retirement Plans [Line Items]      
Fair value of plan assets 1 0  
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Government      
Retirement Plans [Line Items]      
Fair value of plan assets 80 74  
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Corporate/Other      
Retirement Plans [Line Items]      
Fair value of plan assets 301 292  
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Hedge Funds      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Real Estate      
Retirement Plans [Line Items]      
Fair value of plan assets 26 24  
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Total Plan Assets Excluding Plan Assets Measured Using NAV Practical Expedient [Member]      
Retirement Plans [Line Items]      
Fair value of plan assets 534 513  
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Cash      
Retirement Plans [Line Items]      
Fair value of plan assets 1 10  
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Large-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 211 224  
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Mid Cap [Member]      
Retirement Plans [Line Items]      
Fair value of plan assets   0  
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | International-Developed      
Retirement Plans [Line Items]      
Fair value of plan assets 260 459  
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | International - Emerging      
Retirement Plans [Line Items]      
Fair value of plan assets 14 13  
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Government      
Retirement Plans [Line Items]      
Fair value of plan assets 750 544  
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Corporate/Other      
Retirement Plans [Line Items]      
Fair value of plan assets 244 277  
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Hedge Funds      
Retirement Plans [Line Items]      
Fair value of plan assets 82 112  
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Real Estate      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Total Plan Assets Excluding Plan Assets Measured Using NAV Practical Expedient [Member]      
Retirement Plans [Line Items]      
Fair value of plan assets 1,562 1,639  
Non-US [Member] | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Cash      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Non-US [Member] | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Large-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Non-US [Member] | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Mid Cap [Member]      
Retirement Plans [Line Items]      
Fair value of plan assets   0  
Non-US [Member] | Fair Value, Inputs, Level 3 | Pension Plan [Member] | International-Developed      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Non-US [Member] | Fair Value, Inputs, Level 3 | Pension Plan [Member] | International - Emerging      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Non-US [Member] | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Government      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Non-US [Member] | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Corporate/Other      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Non-US [Member] | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Hedge Funds      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Non-US [Member] | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Real Estate      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Non-US [Member] | Fair Value, Inputs, Level 3 | Pension Plan [Member] | Total Plan Assets Excluding Plan Assets Measured Using NAV Practical Expedient [Member]      
Retirement Plans [Line Items]      
Fair value of plan assets $ 0 $ 0