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Plan Assets by Asset Category (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2017
Postretirement Benefits      
Retirement Plans [Line Items]      
Fair value of plan assets $ 163 $ 174 $ 177
Postretirement Benefits | Cash      
Retirement Plans [Line Items]      
Fair value of plan assets 6 13  
Postretirement Benefits | Large-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 22 26  
Postretirement Benefits | Small-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 8 8  
Postretirement Benefits | International-Developed      
Retirement Plans [Line Items]      
Fair value of plan assets 19 20  
Postretirement Benefits | International - Emerging      
Retirement Plans [Line Items]      
Fair value of plan assets 9 9  
Postretirement Benefits | Government      
Retirement Plans [Line Items]      
Fair value of plan assets 20 20  
Postretirement Benefits | Corporate/Other      
Retirement Plans [Line Items]      
Fair value of plan assets 55 55  
Postretirement Benefits | Commodities      
Retirement Plans [Line Items]      
Fair value of plan assets 13 14  
Postretirement Benefits | Real Estate      
Retirement Plans [Line Items]      
Fair value of plan assets 11 9  
Fair Value, Inputs, Level 1 | Postretirement Benefits      
Retirement Plans [Line Items]      
Fair value of plan assets 6 13  
Fair Value, Inputs, Level 1 | Postretirement Benefits | Cash      
Retirement Plans [Line Items]      
Fair value of plan assets 6 13  
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 157 161  
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Cash      
Retirement Plans [Line Items]      
Fair value of plan assets 0 0  
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Large-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 22 26  
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Small-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 8 8  
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | International-Developed      
Retirement Plans [Line Items]      
Fair value of plan assets 19 20  
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | International - Emerging      
Retirement Plans [Line Items]      
Fair value of plan assets 9 9  
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Government      
Retirement Plans [Line Items]      
Fair value of plan assets 20 20  
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Corporate/Other      
Retirement Plans [Line Items]      
Fair value of plan assets 55 55  
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Commodities      
Retirement Plans [Line Items]      
Fair value of plan assets 13 14  
Significant Other Observable Inputs (Level 2) | Postretirement Benefits | Real Estate      
Retirement Plans [Line Items]      
Fair value of plan assets 11 9  
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 2,736 3,046 3,165
United States | Pension Plan [Member] | Cash      
Retirement Plans [Line Items]      
Fair value of plan assets 55 23  
United States | Pension Plan [Member] | Large-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 276 430  
United States | Pension Plan [Member] | Small-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 232 282  
United States | Pension Plan [Member] | International-Developed      
Retirement Plans [Line Items]      
Fair value of plan assets 266 411  
United States | Pension Plan [Member] | International - Emerging      
Retirement Plans [Line Items]      
Fair value of plan assets 52 94  
United States | Pension Plan [Member] | Government      
Retirement Plans [Line Items]      
Fair value of plan assets 332 333  
United States | Pension Plan [Member] | Corporate/Other      
Retirement Plans [Line Items]      
Fair value of plan assets 1,266 1,183  
United States | Pension Plan [Member] | Defined Benefit Plan, Real Estate [Member]      
Retirement Plans [Line Items]      
Fair value of plan assets 55    
United States | Pension Plan [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]      
Retirement Plans [Line Items]      
Fair value of plan assets 2,534 2,756  
United States | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Cash      
Retirement Plans [Line Items]      
Fair value of plan assets 24 2  
United States | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Large-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 276 309  
United States | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Small-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 232 282  
United States | Fair Value, Inputs, Level 1 | Pension Plan [Member] | International-Developed      
Retirement Plans [Line Items]      
Fair value of plan assets 233 365  
United States | Fair Value, Inputs, Level 1 | Pension Plan [Member] | International - Emerging      
Retirement Plans [Line Items]      
Fair value of plan assets 42 80  
United States | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Government      
Retirement Plans [Line Items]      
Fair value of plan assets 47 307  
United States | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Corporate/Other      
Retirement Plans [Line Items]      
Fair value of plan assets 1,266 1,119  
United States | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Defined Benefit Plan, Real Estate [Member]      
Retirement Plans [Line Items]      
Fair value of plan assets 55    
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 2,175 2,464  
United States | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Cash      
Retirement Plans [Line Items]      
Fair value of plan assets 31 21  
United States | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Large-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 0 121  
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 33 46  
United States | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | International - Emerging      
Retirement Plans [Line Items]      
Fair value of plan assets 10 14  
United States | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Government      
Retirement Plans [Line Items]      
Fair value of plan assets 285 26  
United States | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Corporate/Other      
Retirement Plans [Line Items]      
Fair value of plan assets 0 64  
United States | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Defined Benefit Plan, Real Estate [Member]      
Retirement Plans [Line Items]      
Fair value of plan assets 0    
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 359 292  
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] | Defined Benefit Plan, Real Estate [Member]      
Retirement Plans [Line Items]      
Fair value of plan assets 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  
United States | Fair Value Measured at Net Asset Value Per Share [Member] | Pension Plan [Member] | Real Estate      
Retirement Plans [Line Items]      
Fair value of plan assets 202 290  
Non-US [Member] | Pension Plan [Member]      
Retirement Plans [Line Items]      
Fair value of plan assets 2,098 2,117 $ 2,181
Non-US [Member] | Pension Plan [Member] | Cash      
Retirement Plans [Line Items]      
Fair value of plan assets 174 44  
Non-US [Member] | Pension Plan [Member] | Large-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 214 235  
Non-US [Member] | Pension Plan [Member] | International-Developed      
Retirement Plans [Line Items]      
Fair value of plan assets 289 319  
Non-US [Member] | Pension Plan [Member] | International - Emerging      
Retirement Plans [Line Items]      
Fair value of plan assets 12 15  
Non-US [Member] | Pension Plan [Member] | Government      
Retirement Plans [Line Items]      
Fair value of plan assets 778 830  
Non-US [Member] | Pension Plan [Member] | Corporate/Other      
Retirement Plans [Line Items]      
Fair value of plan assets 517 545  
Non-US [Member] | Pension Plan [Member] | Hedge Funds      
Retirement Plans [Line Items]      
Fair value of plan assets 69 82  
Non-US [Member] | Pension Plan [Member] | Fair Value, Inputs, Level 1, 2 and 3 [Member]      
Retirement Plans [Line Items]      
Fair value of plan assets 2,084 2,096  
Non-US [Member] | Pension Plan [Member] | Real Estate      
Retirement Plans [Line Items]      
Fair value of plan assets 31 26  
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Cash      
Retirement Plans [Line Items]      
Fair value of plan assets 174 43  
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Large-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 23 24  
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | International-Developed      
Retirement Plans [Line Items]      
Fair value of plan assets 54 59  
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | International - Emerging      
Retirement Plans [Line Items]      
Fair value of plan assets 1 1  
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Government      
Retirement Plans [Line Items]      
Fair value of plan assets 69 80  
Non-US [Member] | Fair Value, Inputs, Level 1 | Pension Plan [Member] | Corporate/Other      
Retirement Plans [Line Items]      
Fair value of plan assets 289 301  
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 31 26  
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 641 534  
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Cash      
Retirement Plans [Line Items]      
Fair value of plan assets 0 1  
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Large-Cap      
Retirement Plans [Line Items]      
Fair value of plan assets 191 211  
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | International-Developed      
Retirement Plans [Line Items]      
Fair value of plan assets 235 260  
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | International - Emerging      
Retirement Plans [Line Items]      
Fair value of plan assets 11 14  
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Government      
Retirement Plans [Line Items]      
Fair value of plan assets 709 750  
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Corporate/Other      
Retirement Plans [Line Items]      
Fair value of plan assets 228 244  
Non-US [Member] | Significant Other Observable Inputs (Level 2) | Pension Plan [Member] | Hedge Funds      
Retirement Plans [Line Items]      
Fair value of plan assets 69 82  
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 1,443 1,562  
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] | 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  
Non-US [Member] | Fair Value Measured at Net Asset Value Per Share [Member] | Pension Plan [Member] | Real Estate      
Retirement Plans [Line Items]      
Fair value of plan assets $ 14 $ 21