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Regulatory Capital and Other Regulatory Matters - Schedule of Regulatory Capital Amount and Ratios (Details) $ in Millions | Sep. 30, 2025 USD ($) | Dec. 31, 2024 USD ($) | Oct. 31, 2024 | Oct. 31, 2023
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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 |  |  |
Tier one leverage ratio, minimum | 0.04 |  |  |
Minimum capital conservation buffer | 0.025 |  |  |
Accumulated other comprehensive losses excluded from Common Equity Tier 1 capital | $ 3,000 | $ 3,900 |  |
Brokered deposits | $ 5,000 |  |  |
Percentage of interest-bearing domestic deposits to deposits, brokered | 3.40% |  |  |
Common equity tier one capital | $ 15,184 | $ 15,058 |  |
Common equity tier one capital ratio | 0.1007 | 0.0982 |  |
Tier one capital to risk-weighted assets, amount | $ 17,440 | $ 17,324 |  |
Tier one capital to risk-weighted assets, ratio | 0.1157 | 0.1130 |  |
Tier one capital to risk-weighted assets, well-capitalized minimum | 0.0600 |  |  |
Capital to risk-weighted assets, amount | $ 20,259 | $ 20,182 |  |
Capital to risk-weighted assets, ratio | 0.1344 | 0.1316 |  |
Capital to risk weighted assets, well-capitalized minimum | 0.1000 |  |  |
Tier one leverage to adjusted quarterly average assets, amount | $ 17,440 | $ 17,324 |  |
Tier one leverage to adjusted quarterly average assets, ratio | 0.0918 | 0.0892 |  |
Ally Financial Inc |  |  |  |
Compliance with Regulatory Capital Requirements under Banking Regulations [Line Items] |  |  |  |
Minimum capital conservation buffer | 0.026 | 0.026 | 0.026 | 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 |  |  |
Tier one leverage ratio, minimum | 0.0400 |  |  |
Minimum capital conservation buffer | 0.025 | 0.025 |  |
Common equity tier one capital | $ 17,773 | $ 17,229 |  |
Common equity tier one capital ratio | 0.1262 | 0.1194 |  |
Common equity tier one capital, well capitalized minimum | 0.0650 |  |  |
Tier one capital to risk-weighted assets, amount | $ 17,773 | $ 17,229 |  |
Tier one capital to risk-weighted assets, ratio | 0.1262 | 0.1194 |  |
Tier one capital to risk-weighted assets, well-capitalized minimum | 0.0800 |  |  |
Capital to risk-weighted assets, amount | $ 19,555 | $ 19,052 |  |
Capital to risk-weighted assets, ratio | 0.1388 | 0.1321 |  |
Capital to risk weighted assets, well-capitalized minimum | 0.1000 |  |  |
Tier one leverage to adjusted quarterly average assets, amount | $ 17,773 | $ 17,229 |  |
Tier one leverage to adjusted quarterly average assets, ratio | 0.0995 | 0.0940 |  |
Tier one leverage to adjusted quarterly average assets, well-capitalized minimum | 0.0500 |  |  |

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- Definition Minimum capital conservation buffer percentage required to avoid restriction on payout amount of eligible retained income as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 + Details
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- Definition Amount of total capital as defined by regulatory framework. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 505 -Name Accounting Standards Codification -Section 50 -Paragraph 1 -Subparagraph (c)(1) -Publisher FASB -URI https://asc.fasb.org/1943274/2147477270/942-505-50-1 + Details
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