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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
		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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