v3.25.2
Cover Document - shares
 6 Months Ended
Jun. 30, 2025
Jul. 18, 2025
Entity Information [Line Items]    
Document Type 10-Q  
Document Quarterly Report true  
Document Period End Date Jun. 30, 2025  
Document Transition Report false  
Entity File Number 001-36560  
Entity Registrant Name SYNCHRONY FINANCIAL  
Entity Incorporation, State or Country Code DE  
Entity Tax Identification Number 51-0483352  
Entity Address, Address Line One 777 Long Ridge Road  
Entity Address, City or Town Stamford,  
Entity Address, State or Province CT  
Entity Address, Postal Zip Code 06902  
City Area Code 203  
Local Phone Number 585-2400  
Entity Current Reporting Status Yes  
Entity Interactive Data Current Yes  
Entity Filer Category Large Accelerated Filer  
Entity Smaller Reporting Company false  
Entity Emerging Growth Company false  
Entity Shell Company false  
Entity Common Stock, Shares Outstanding   372,057,548
Entity Central Index Key 0001601712  
Amendment Flag false  
Document Fiscal Year Focus 2025  
Document Fiscal Period Focus Q2  
Current Fiscal Year End Date --12-31  
Common Stock    
Entity Information [Line Items]    
Title of 12(b) Security Common stock, par value $0.001 per share  
Trading Symbol SYF  
Security Exchange Name NYSE  
Series A Preferred Stock    
Entity Information [Line Items]    
Title of 12(b) Security Depositary Shares Each Representing a 1/40th Interest in a Share of 5.625% Fixed Rate Non-Cumulative Perpetual Preferred Stock, Series A  
Trading Symbol SYFPrA  
Security Exchange Name NYSE  
Series B Preferred Stock    
Entity Information [Line Items]    
Title of 12(b) Security Depositary Shares Each Representing a 1/40th Interest in a Share of 8.250% Fixed Rate Reset Non-Cumulative Perpetual Preferred Stock, Series B  
Trading Symbol SYFPrB  
Security Exchange Name NYSE