v3.25.4
Fair Value Measurement - Schedule of Financial Instruments Carried at Fair Value (Details) - USD ($)
$ in Millions
Dec. 31, 2025
Dec. 31, 2024
Assets:    
Total debt securities available-for-sale $ 15,701 $ 10,402
Total equity securities 65 14
Total securities 15,766  
Total assets at fair value 16,033 11,031
Liabilities:    
Total liabilities at fair value 23 35
Commercial real estate    
Assets:    
Loans held for sale 48 182
One-to-four family first mortgage    
Assets:    
Loans held for sale   382
Loans held for investment | Residential first mortgage loans    
Assets:    
Loans held for sale 193  
Interest rate swaps    
Assets:    
Derivative assets 19 15
Liabilities:    
Derivative liabilities 21  
Rate lock commitments (fallout adjustments)    
Assets:    
Derivative assets 4 3
Liabilities:    
Derivative liabilities 1 3
Interest rate caps    
Assets:    
Derivative assets 3  
Mortgage-backed securities forwards    
Assets:    
Derivative assets   7
Liabilities:    
Derivative liabilities 1 2
Mortgage servicing rights    
Assets:    
Mortgage servicing rights   26
Interest rate swaps and swaptions    
Liabilities:    
Derivative liabilities   30
Total debt securities available-for-sale    
Assets:    
Total debt securities available-for-sale 15,701 10,402
Mortgage-related debt securities available-for-sale:    
Assets:    
Total debt securities available-for-sale 12,982 8,573
GSE CMOs    
Assets:    
Total debt securities available-for-sale 11,824 7,304
GSE certificates    
Assets:    
Total debt securities available-for-sale 999 1,106
Private label CMOs    
Assets:    
Total debt securities available-for-sale 159 163
Other debt securities available-for-sale:    
Assets:    
Total debt securities available-for-sale 2,719 1,829
GSE debentures    
Assets:    
Total debt securities available-for-sale 1,296 1,203
U. S. Treasury obligations    
Assets:    
Total debt securities available-for-sale 1,017  
Asset-backed securities    
Assets:    
Total debt securities available-for-sale 213 236
Corporate bonds    
Assets:    
Total debt securities available-for-sale 144 308
Municipal bonds, foreign notes, and capital trust    
Assets:    
Total debt securities available-for-sale 49 82
Equity securities:    
Assets:    
Total equity securities 65 14
Mutual funds and common stock    
Assets:    
Total equity securities 65 14
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Total securities 1,068  
Total assets at fair value 1,068 0
Liabilities:    
Total liabilities at fair value 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial real estate    
Assets:    
Loans held for sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | One-to-four family first mortgage    
Assets:    
Loans held for sale   0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans held for investment | Residential first mortgage loans    
Assets:    
Loans held for sale 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swaps    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Rate lock commitments (fallout adjustments)    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate caps    
Assets:    
Derivative assets 0  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities forwards    
Assets:    
Derivative assets   0
Liabilities:    
Derivative liabilities 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage servicing rights    
Assets:    
Mortgage servicing rights   0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swaps and swaptions    
Liabilities:    
Derivative liabilities   0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Total debt securities available-for-sale    
Assets:    
Total debt securities available-for-sale 1,017 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-related debt securities available-for-sale:    
Assets:    
Total debt securities available-for-sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | GSE CMOs    
Assets:    
Total debt securities available-for-sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | GSE certificates    
Assets:    
Total debt securities available-for-sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Private label CMOs    
Assets:    
Total debt securities available-for-sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Other debt securities available-for-sale:    
Assets:    
Total debt securities available-for-sale 1,017 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | GSE debentures    
Assets:    
Total debt securities available-for-sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | U. S. Treasury obligations    
Assets:    
Total debt securities available-for-sale 1,017  
Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities    
Assets:    
Total debt securities available-for-sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds    
Assets:    
Total debt securities available-for-sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal bonds, foreign notes, and capital trust    
Assets:    
Total debt securities available-for-sale 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Equity securities:    
Assets:    
Total equity securities 51 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds and common stock    
Assets:    
Total equity securities 51 0
Significant Other Observable Inputs (Level 2)    
Assets:    
Total securities 14,675  
Total assets at fair value 14,938 10,969
Liabilities:    
Total liabilities at fair value 22 32
Significant Other Observable Inputs (Level 2) | Commercial real estate    
Assets:    
Loans held for sale 48 182
Significant Other Observable Inputs (Level 2) | One-to-four family first mortgage    
Assets:    
Loans held for sale   382
Significant Other Observable Inputs (Level 2) | Loans held for investment | Residential first mortgage loans    
Assets:    
Loans held for sale 193  
Significant Other Observable Inputs (Level 2) | Interest rate swaps    
Assets:    
Derivative assets 19 15
Liabilities:    
Derivative liabilities 21  
Significant Other Observable Inputs (Level 2) | Rate lock commitments (fallout adjustments)    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0 0
Significant Other Observable Inputs (Level 2) | Interest rate caps    
Assets:    
Derivative assets 3  
Significant Other Observable Inputs (Level 2) | Mortgage-backed securities forwards    
Assets:    
Derivative assets   7
Liabilities:    
Derivative liabilities 1 2
Significant Other Observable Inputs (Level 2) | Mortgage servicing rights    
Assets:    
Mortgage servicing rights   0
Significant Other Observable Inputs (Level 2) | Interest rate swaps and swaptions    
Liabilities:    
Derivative liabilities   30
Significant Other Observable Inputs (Level 2) | Total debt securities available-for-sale    
Assets:    
Total debt securities available-for-sale 14,661 10,369
Significant Other Observable Inputs (Level 2) | Mortgage-related debt securities available-for-sale:    
Assets:    
Total debt securities available-for-sale 12,959 8,540
Significant Other Observable Inputs (Level 2) | GSE CMOs    
Assets:    
Total debt securities available-for-sale 11,824 7,304
Significant Other Observable Inputs (Level 2) | GSE certificates    
Assets:    
Total debt securities available-for-sale 999 1,106
Significant Other Observable Inputs (Level 2) | Private label CMOs    
Assets:    
Total debt securities available-for-sale 136 130
Significant Other Observable Inputs (Level 2) | Other debt securities available-for-sale:    
Assets:    
Total debt securities available-for-sale 1,702 1,829
Significant Other Observable Inputs (Level 2) | GSE debentures    
Assets:    
Total debt securities available-for-sale 1,296 1,203
Significant Other Observable Inputs (Level 2) | U. S. Treasury obligations    
Assets:    
Total debt securities available-for-sale 0  
Significant Other Observable Inputs (Level 2) | Asset-backed securities    
Assets:    
Total debt securities available-for-sale 213 236
Significant Other Observable Inputs (Level 2) | Corporate bonds    
Assets:    
Total debt securities available-for-sale 144 308
Significant Other Observable Inputs (Level 2) | Municipal bonds, foreign notes, and capital trust    
Assets:    
Total debt securities available-for-sale 49 82
Significant Other Observable Inputs (Level 2) | Equity securities:    
Assets:    
Total equity securities 14 14
Significant Other Observable Inputs (Level 2) | Mutual funds and common stock    
Assets:    
Total equity securities 14 14
Significant Unobservable Inputs (Level 3)    
Assets:    
Total securities 23  
Total assets at fair value 27 62
Liabilities:    
Total liabilities at fair value 1 3
Significant Unobservable Inputs (Level 3) | Commercial real estate    
Assets:    
Loans held for sale 0 0
Significant Unobservable Inputs (Level 3) | One-to-four family first mortgage    
Assets:    
Loans held for sale   0
Significant Unobservable Inputs (Level 3) | Loans held for investment | Residential first mortgage loans    
Assets:    
Loans held for sale 0  
Significant Unobservable Inputs (Level 3) | Interest rate swaps    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0  
Significant Unobservable Inputs (Level 3) | Rate lock commitments (fallout adjustments)    
Assets:    
Derivative assets 4 3
Liabilities:    
Derivative liabilities 1 3
Significant Unobservable Inputs (Level 3) | Interest rate caps    
Assets:    
Derivative assets 0  
Significant Unobservable Inputs (Level 3) | Mortgage-backed securities forwards    
Assets:    
Derivative assets   0
Liabilities:    
Derivative liabilities 0 0
Significant Unobservable Inputs (Level 3) | Mortgage servicing rights    
Assets:    
Mortgage servicing rights   26
Significant Unobservable Inputs (Level 3) | Interest rate swaps and swaptions    
Liabilities:    
Derivative liabilities   0
Significant Unobservable Inputs (Level 3) | Total debt securities available-for-sale    
Assets:    
Total debt securities available-for-sale 23 33
Significant Unobservable Inputs (Level 3) | Mortgage-related debt securities available-for-sale:    
Assets:    
Total debt securities available-for-sale 23 33
Significant Unobservable Inputs (Level 3) | GSE CMOs    
Assets:    
Total debt securities available-for-sale 0 0
Significant Unobservable Inputs (Level 3) | GSE certificates    
Assets:    
Total debt securities available-for-sale 0 0
Significant Unobservable Inputs (Level 3) | Private label CMOs    
Assets:    
Total debt securities available-for-sale 23 33
Significant Unobservable Inputs (Level 3) | Other debt securities available-for-sale:    
Assets:    
Total debt securities available-for-sale 0 0
Significant Unobservable Inputs (Level 3) | GSE debentures    
Assets:    
Total debt securities available-for-sale 0 0
Significant Unobservable Inputs (Level 3) | U. S. Treasury obligations    
Assets:    
Total debt securities available-for-sale 0  
Significant Unobservable Inputs (Level 3) | Asset-backed securities    
Assets:    
Total debt securities available-for-sale 0 0
Significant Unobservable Inputs (Level 3) | Corporate bonds    
Assets:    
Total debt securities available-for-sale 0 0
Significant Unobservable Inputs (Level 3) | Municipal bonds, foreign notes, and capital trust    
Assets:    
Total debt securities available-for-sale 0 0
Significant Unobservable Inputs (Level 3) | Equity securities:    
Assets:    
Total equity securities 0 0
Significant Unobservable Inputs (Level 3) | Mutual funds and common stock    
Assets:    
Total equity securities $ 0 $ 0