v3.26.1
Derivative and Hedging Activities - Schedule of Notional Amount and Fair Value of Derivative Financial Instruments (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Dec. 31, 2025
Assets          
Net gain on loan sales and securitizations $ 4 $ 6 $ 9 $ 19  
Rate lock commitments          
Assets          
Net gain on loan sales and securitizations 0 $ 0 0 $ (9)  
Derivatives designated as hedging instruments: | Interest rate swaps | Fair Value Hedging          
Assets          
Notional Amount 3,993   3,993   $ 3,993
Derivatives designated as hedging instruments: | Interest rate swaps | Balance Sheet Location [Axis]: us-gaap:OtherAssets | Fair Value Hedging          
Assets          
Fair Value 0   0   0
Derivatives designated as hedging instruments: | Interest rate swaps | Balance Sheet Location [Axis]: us-gaap:OtherLiabilities | Fair Value Hedging          
Assets          
Fair Value 0   0   0
Derivatives not designated as hedging instruments: | Interest rate swaps          
Assets          
Notional Amount 5,089   5,089   3,926
Derivatives not designated as hedging instruments: | Interest rate swaps | Balance Sheet Location [Axis]: us-gaap:OtherAssets          
Assets          
Fair Value 15   15   19
Derivatives not designated as hedging instruments: | Interest rate swaps | Balance Sheet Location [Axis]: us-gaap:OtherLiabilities          
Assets          
Fair Value 22   22   21
Derivatives not designated as hedging instruments: | Rate lock commitments          
Assets          
Notional Amount 670   670   241
Derivatives not designated as hedging instruments: | Rate lock commitments | Balance Sheet Location [Axis]: us-gaap:OtherAssets          
Assets          
Fair Value 2   2   4
Derivatives not designated as hedging instruments: | Rate lock commitments | Balance Sheet Location [Axis]: us-gaap:OtherLiabilities          
Assets          
Fair Value 0   0   1
Derivatives not designated as hedging instruments: | Mortgage-backed securities forwards          
Assets          
Notional Amount 205   205   203
Derivatives not designated as hedging instruments: | Mortgage-backed securities forwards | Balance Sheet Location [Axis]: us-gaap:OtherAssets          
Assets          
Fair Value 0   0   0
Derivatives not designated as hedging instruments: | Mortgage-backed securities forwards | Balance Sheet Location [Axis]: us-gaap:OtherLiabilities          
Assets          
Fair Value 1   1   1
Derivatives not designated as hedging instruments: | Interest rate caps          
Assets          
Notional Amount 2,000   2,000   2,000
Derivatives not designated as hedging instruments: | Interest rate caps | Balance Sheet Location [Axis]: us-gaap:OtherAssets          
Assets          
Fair Value 2   2   3
Derivatives not designated as hedging instruments: | Interest rate caps | Balance Sheet Location [Axis]: us-gaap:OtherLiabilities          
Assets          
Fair Value 0   0   0
Derivatives not designated as hedging instruments: | Foreign currency forwards          
Assets          
Notional Amount 35   35   0
Derivatives not designated as hedging instruments: | Foreign currency forwards | Balance Sheet Location [Axis]: us-gaap:OtherAssets          
Assets          
Fair Value 0   0   0
Derivatives not designated as hedging instruments: | Foreign currency forwards | Balance Sheet Location [Axis]: us-gaap:OtherLiabilities          
Assets          
Fair Value $ 0   $ 0   $ 0