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Regulatory Capital and Other Regulatory Matters (Common Share Repurchases) (Details) |  | 3 Months Ended | 93 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Apr. 15, 2024 $ / shares | Mar. 31, 2024 USD ($) $ / shares shares | Dec. 31, 2023 USD ($) $ / shares shares | Sep. 30, 2023 USD ($) $ / shares shares | Jun. 30, 2023 USD ($) $ / shares shares | Mar. 31, 2023 USD ($) $ / shares shares | Mar. 31, 2024 $ / shares shares | Jul. 31, 2023 | Feb. 28, 2023 USD ($) | Dec. 31, 2022 shares | Aug. 31, 2022 | Jun. 30, 2016 shares
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum capital conservation buffer |  |  | 0.025 |  |  |  |  | 0.025 |  |  |  |  |
Stock repurchased during period, value | $ |  |  | $ 29,000,000 | $ 4,000,000 | $ 0 | $ 2,000,000 | $ 27,000,000 |  |  |  |  |  |
Stock repurchased during period, number of shares (in share) | shares |  |  | 781,000 | 145,000 | 5,000 | 58,000 | 836,000 |  |  |  |  |  |
Common stock, shares outstanding (in shares) | shares |  |  | 303,977,972 | 302,459,258 | 301,630,000 | 301,619,000 | 300,821,000 | 303,977,972 |  |  | 299,324,000 |  | 484,000,000
Dividends declared (in dollars per share) |  |  | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 | $ 0.30 |  |  |  |  |
Common stock, share reduction |  |  |  |  |  |  |  | 37.00% |  |  |  |  |
Cash dividends declared per common share (in dollars per share) | [1] |  | $ 0.30 |  |  |  | $ 0.30 |  |  |  |  |  |
Subsequent event |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Cash dividends declared per common share (in dollars per share) |  | $ 0.30 |  |  |  |  |  |  |  |  |  |  |
Ally Financial Inc |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum capital conservation buffer |  |  | 0.025 | 0.025 |  | 0.025 |  | 0.025 | 0.025 |  |  | 0.025 |
Unsecured debt |  |  |  |  |  |  |  |  |  |  |  |  |
Accelerated Share Repurchases [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |
Proceeds from issuance of subordinated long-term debt | $ |  |  |  |  |  |  |  |  |  | $ 500,000,000 |  |  |
[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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