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Regulatory Capital and Other Regulatory Matters - Schedule of Common Share Repurchases (Details) $ / shares in Units, $ in Millions |  | 1 Months Ended | 3 Months Ended | 9 Months Ended | 111 Months Ended |  |  |  |  |
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Oct. 07, 2025 $ / shares | Aug. 31, 2025 USD ($) | Dec. 31, 2024 USD ($) $ / shares shares | Nov. 30, 2024 USD ($) | Jun. 30, 2024 USD ($) $ / shares shares | Feb. 28, 2023 USD ($) | Sep. 30, 2025 USD ($) $ / shares shares | Jun. 30, 2025 USD ($) $ / shares shares | Mar. 31, 2025 USD ($) $ / shares shares | Dec. 31, 2024 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) $ / shares shares | Jun. 30, 2024 USD ($) $ / shares shares | Mar. 31, 2024 USD ($) $ / shares shares | Sep. 30, 2025 USD ($) $ / shares shares | Sep. 30, 2024 USD ($) $ / shares shares | Sep. 30, 2025 $ / shares shares | Oct. 31, 2025 | Oct. 31, 2024 | Dec. 31, 2023 shares | Oct. 31, 2023 | Jun. 30, 2016 shares
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum capital conservation buffer |  |  |  |  |  |  |  | 0.025 |  |  |  |  |  |  | 0.025 |  | 0.025 |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,571 | $ 2,866 |  |  |  |  |  |
Stock repurchased during period, value |  |  |  |  |  |  |  | $ 1 | $ 1 | $ 34 | $ 7 | $ 1 | $ 1 | $ 29 |  |  |  |  |  |  |  |
Stock repurchased during period, number of shares (in share) | shares |  |  |  |  |  |  |  | 25,000 | 27,000 | 877,000 | 167,000 | 27,000 | 13,000 | 781,000 |  |  |  |  |  |  |  |
Common stock, shares outstanding (in shares) | shares |  |  |  | 305,387,550 |  | 304,656,000 |  | 307,827,978 | 307,787,000 | 307,152,000 | 305,387,550 | 304,715,000 | 304,656,000 | 303,978,000 | 307,827,978 | 304,715,000 | 307,827,978 |  |  | 302,459,000 |  | 484,000,000
Dividends declared (in dollars per share) | $ / shares |  |  |  | $ 0.30 |  | $ 0.30 |  | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 |  |  |  |  |
Common stock, share reduction |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 36.00% |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ / shares | [1] |  |  |  |  |  |  | $ 0.30 |  |  |  | $ 0.30 |  |  | $ 0.90 | $ 0.90 |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | $ / shares |  | $ 0.30 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Credit-Linked Notes |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  | $ 550 |  | $ 440 | $ 330 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Automotive | Credit-Linked Notes | Consumer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Debt instrument, reference portfolio amount |  |  | $ 5,000 |  | $ 4,000 | $ 3,000 |  |  |  |  |  |  | $ 3,000 |  |  |  |  |  |  |  |  |
Ally Financial Inc |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum capital conservation buffer |  |  |  | 0.026 |  |  |  | 0.026 |  |  | 0.026 |  |  |  | 0.026 |  | 0.026 |  | 0.026 |  | 0.025 |
Ally Financial Inc | Forecast |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum capital conservation buffer |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.026 |  |  |  |
Unsecured debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of long-term debt |  |  |  | $ 500 |  |  | $ 500 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
[1] | Figures in the table may not recalculate exactly due to rounding. Earnings per share is calculated based on unrounded numbers.

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