v3.25.2
Document and Entity Information
Jul. 18, 2025
Cover [Abstract]  
Document Type 8-K
Document Period End Date Jul. 18, 2025
Entity File Number 1-3754
Entity Registrant Name ALLY FINANCIAL INC.
Entity Incorporation State Country Code DE
Entity Tax Identification Number 38-0572512
Entity Address Address Line 1 Ally Detroit Center
Entity Address Address Line 2 500 Woodward Ave.
Entity Address Address Line 3 Floor 10
Entity Address City Or Town Detroit
Entity Address State Or Province MI
Entity Address Postal Zip Code 48226
City Area Code 866
Local Phone Number 710-4623
Written Communications false
Soliciting Material false
Pre Commencement Tender Offer false
Pre Commencement Issuer Tender Offer false
Security Exchange Name NYSE
Security 12b Title Common Stock, par value $0.01 per share
Trading Symbol ALLY
Entity Emerging Growth Company false
Amendment Flag false
Entity Central Index Key 0000040729