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Other Income (Expense), Net (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017
Other Income (Expense), Net |  |
Increase (Decrease) in Other Income (Expense) | $ 12 |
Deposit Liabilities, Description | 21 | 0
External services | $ 3 | $ 4
Interest income | 6 | 6
Gains (losses) on investments | (7) | 2
Miscellaneous | 1 | 0
Total other income (expense), net | $ 24 | $ 12

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