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Regulatory Capital and Other Regulatory Matters (Schedule of Regulatory Capital Amount and Ratios) (Details) $ in Millions | Mar. 31, 2024 USD ($) | Dec. 31, 2023 USD ($) | Jul. 31, 2023 | Jun. 30, 2023 | Aug. 31, 2022
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Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Common equity tier one capital ratio, minimum | 0.045 |  |  |  |
Tier one capital to risk-weighted assets, required minimum | 0.06 |  |  |  |
Capital to risk-weighted assets, required minimum | 0.08 |  |  |  |
Minimum capital conservation buffer | 0.025 |  |  |  |
Accumulated other comprehensive losses excluded from Common Equity Tier 1 Capital | $ 4,000 | $ 3,800 |  |  |
Brokered deposits | $ 8,500 |  |  |  |
Percentage of interest-bearing domestic deposits to deposits, brokered | 5.50% |  |  |  |
Common equity tier one capital | $ 14,905 | $ 15,129 |  |  |
Common equity tier one capital ratio | 0.0941 | 0.0936 |  |  |
Tier one capital to risk-weighted assets, amount | $ 17,171 | $ 17,392 |  |  |
Tier one capital to risk-weighted assets, ratio | 0.1084 | 0.1076 |  |  |
Tier one capital to risk-weighted assets, well-capitalized minimum | 0.0600 |  |  |  |
Capital to risk-weighted assets, amount | $ 19,802 | $ 20,055 |  |  |
Capital to risk-weighted assets, ratio | 0.1251 | 0.1241 |  |  |
Capital to risk weighted assets, well-capitalized minimum | 0.1000 |  |  |  |
Tier one leverage to adjusted quarterly average assets, amount | $ 17,171 | $ 17,392 |  |  |
Tier one leverage to adjusted quarterly average assets, ratio | 0.0863 | 0.0867 |  |  |
Tier one leverage ratio, minimum | 0.04 |  |  |  |
Accounting Standards Update 2016-13 |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Deferred reduction to Common Equity Tier 1 Capital from CECL | $ 296 |  |  |  |
Ally Financial Inc |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Minimum capital conservation buffer | 0.025 | 0.025 | 0.025 | 0.025 | 0.025
Ally Bank |  |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |  |
Common equity tier one capital ratio, minimum | 0.0450 |  |  |  |
Tier one capital to risk-weighted assets, required minimum | 0.0600 |  |  |  |
Capital to risk-weighted assets, required minimum | 0.0800 |  |  |  |
Common equity tier one capital | $ 17,290 | $ 17,217 |  |  |
Common equity tier one capital ratio | 0.1153 | 0.1124 |  |  |
Common equity tier one capital, well capitalized minimum | 0.0650 |  |  |  |
Tier one capital to risk-weighted assets, amount | $ 17,290 | $ 17,217 |  |  |
Tier one capital to risk-weighted assets, ratio | 0.1153 | 0.1124 |  |  |
Tier one capital to risk-weighted assets, well-capitalized minimum | 0.0800 |  |  |  |
Capital to risk-weighted assets, amount | $ 19,180 | $ 19,144 |  |  |
Capital to risk-weighted assets, ratio | 0.1280 | 0.1250 |  |  |
Capital to risk weighted assets, well-capitalized minimum | 0.1000 |  |  |  |
Tier one leverage to adjusted quarterly average assets, amount | $ 17,290 | $ 17,217 |  |  |
Tier one leverage to adjusted quarterly average assets, ratio | 0.0919 | 0.0907 |  |  |
Tier one leverage ratio, minimum | 0.0400 |  |  |  |
Tier one leverage to adjusted quarterly average assets, well-capitalized minimum | 0.0500 |  |  |  |

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