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Fair Value of Financial Instruments (Narrative) (Details) - Maximum [Member] - USD ($)
$ in Millions
Sep. 30, 2019
Sep. 30, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Fair Value, Assets, Level 1 to Level 2 Transfers, Amount $ 1 $ 1
Fair Value, Assets, Level 2 to Level 1 Transfers, Amount 1 1
Fair Value, Liabilities, Level 1 to Level 2 Transfers, Amount 1 1
Fair Value, Liabilities, Level 2 to Level 1 Transfers, Amount $ 1 $ 1