Quarterly report pursuant to Section 13 or 15(d)

DEBT - Schedule of Long-Term Debt and Debt Issuances (Details)

v3.21.2
DEBT - Schedule of Long-Term Debt and Debt Issuances (Details) - USD ($)
$ in Millions
6 Months Ended
Jun. 30, 2021
Jun. 09, 2021
Dec. 31, 2020
Debt Instrument [Line Items]      
Long-term debt $ 7,342   $ 8,352
TCF Financial Corporation      
Debt Instrument [Line Items]      
Long-term debt   $ 1,516  
Subordinated Notes | TCF Financial Corporation      
Debt Instrument [Line Items]      
Long-term debt 637    
Federal Home Loan Bank advances      
Debt Instrument [Line Items]      
Long-term debt 214   3
Federal Home Loan Bank advances | TCF Financial Corporation      
Debt Instrument [Line Items]      
Long-term debt $ 214    
Debt stated interest rate 1.03%    
Notes Payable, Other Payables      
Debt Instrument [Line Items]      
Long-term debt $ 484   441
Parent      
Debt Instrument [Line Items]      
Long-term debt $ 3,333   4,142
Parent | London Interbank Offered Rate (LIBOR) | TCF Financial Corporation | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.15%    
Parent | London Interbank Offered Rate (LIBOR) | TCF Financial Corporation | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate 3.50%    
Parent | Senior Notes      
Debt Instrument [Line Items]      
Long-term debt $ 2,807   3,635
Parent | Subordinated Notes      
Debt Instrument [Line Items]      
Long-term debt 526   507
Parent | Subordinated Notes | TCF Financial Corporation      
Debt Instrument [Line Items]      
Long-term debt 21    
Bank      
Debt Instrument [Line Items]      
Long-term debt $ 3,311   3,766
Bank | London Interbank Offered Rate (LIBOR) | TCF Financial Corporation | Minimum      
Debt Instrument [Line Items]      
Basis spread on variable rate 0.64%    
Bank | London Interbank Offered Rate (LIBOR) | TCF Financial Corporation | Maximum      
Debt Instrument [Line Items]      
Basis spread on variable rate 3.75%    
Bank | Senior Notes      
Debt Instrument [Line Items]      
Long-term debt $ 2,461   3,533
Bank | Subordinated Notes      
Debt Instrument [Line Items]      
Long-term debt 850   $ 233
Bank | Subordinated Notes | TCF Financial Corporation      
Debt Instrument [Line Items]      
Long-term debt $ 616