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Employee Benefit Plans - Plan Assets (Details) - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits $ 337 $ 341
Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 5 6
Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 332 335
Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 0 0
Cash and Cash Equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 5 6
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 5 6
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 0 0
Cash and Cash Equivalents [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 0 0
U.S. Government Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 29 19
U.S. Government Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 0 0
U.S. Government Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 29 19
U.S. Government Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 0 0
Non-U.S. Government Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 73 56
Non-U.S. Government Securities [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 0 0
Non-U.S. Government Securities [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 73 56
Non-U.S. Government Securities [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 0 0
Corporate Debt Instruments [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 145 147
Corporate Debt Instruments [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 0 0
Corporate Debt Instruments [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 145 147
Corporate Debt Instruments [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 0 0
Corporate Stocks [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 29 31
Corporate Stocks [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 0 0
Corporate Stocks [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 29 31
Corporate Stocks [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 0 0
Listed Real Assets [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 11 10
Listed Real Assets [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 0 0
Listed Real Assets [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 11 10
Listed Real Assets [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 0 0
Insurance Contracts [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 23 50
Insurance Contracts [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 0 0
Insurance Contracts [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 23 50
Insurance Contracts [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 0 0
Accounts Receivable Securitization [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 22 22
Accounts Receivable Securitization [Member] | Fair Value, Inputs, Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 0 0
Accounts Receivable Securitization [Member] | Fair Value, Inputs, Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits 22 22
Accounts Receivable Securitization [Member] | Fair Value, Inputs, Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit plan, assets for plan benefits $ 0 $ 0