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Investments - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 36 Months Ended
--- | --- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Mar. 31, 2015 | Sep. 30, 2019 | Sep. 30, 2018 | Dec. 31, 2017
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investment contribution |  |  |  | $ 0 | $ 305 |
Return of capital from equity method investment |  |  |  | $ 44 | $ 0 |
Options Clearing Corporation |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Investment ownership percentage |  | 40.00% |  | 40.00% |  |
Equity capital |  |  | $ 150 |  |  |
Investment contribution |  |  | $ 60 |  |  |
Dividends received |  |  |  |  |  | $ 31
Return of capital from equity method investment |  |  |  | $ 44 |  |
Scenario, Forecast | Options Clearing Corporation |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Return of capital from equity method investment | $ 16 |  |  |  |  |
2018 Net Income | Options Clearing Corporation |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity earnings in other income |  |  |  | 19 |  |
2019 Net Income | Options Clearing Corporation |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity earnings in other income |  | $ 15 |  | $ 32 |  |

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