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Other Assets (Schedule of Goodwill) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Goodwill [Roll Forward] |  |  |  |
Goodwill |  |  | $ 393 |
Goodwill impairment | $ (50) | $ 0 | (50) | $ 0
Goodwill | 343 |  | 343 |
Operating Segments | Automotive Finance operations |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill |  |  | 20 |
Goodwill impairment |  |  | 0 |
Goodwill | 20 |  | 20 |
Operating Segments | Insurance operations |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill |  |  | 27 |
Goodwill impairment |  |  | 0 |
Goodwill | 27 |  | 27 |
Corporate and Other |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill |  |  | 346 |
Goodwill impairment |  |  | (50) |
Goodwill | 296 |  | 296 |
Ally Lending | Corporate and Other |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill |  |  | 153 |
Goodwill | 153 |  | 153 |
Ally Invest | Corporate and Other |  |  |  |
Goodwill [Roll Forward] |  |  |  |
Goodwill |  |  | 193 |
Goodwill | $ 143 |  | $ 143 |

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