v3.26.1
Fair Value Measurement - Schedule of Financial Instruments Carried at Fair Value (Details) - USD ($)
$ in Millions
Jun. 30, 2026
Dec. 31, 2025
Assets:    
Total debt securities available-for-sale $ 16,553 $ 15,701
Total equity securities 14 65
Total securities 16,567 15,766
Total assets at fair value 16,794 16,033
Liabilities:    
Total liabilities at fair value 23 23
Interest rate swaps    
Assets:    
Derivative assets: 15 19
Liabilities:    
Derivative liabilities: 22 21
Rate lock commitments    
Assets:    
Derivative assets: 2 4
Liabilities:    
Derivative liabilities:   1
Interest rate caps    
Assets:    
Derivative assets: 2 3
Mortgage-backed securities forwards    
Liabilities:    
Derivative liabilities: 1 1
One-to-four family first mortgage    
Assets:    
Loans held for sale: 208  
Residential first mortgage loans | Loans and leases held for investment:    
Assets:    
Loans held for sale:   193
Commercial real estate    
Assets:    
Loans held for sale:   48
Total debt securities available-for-sale    
Assets:    
Total debt securities available-for-sale 16,553 15,701
Total mortgage-related debt securities    
Assets:    
Total debt securities available-for-sale 13,875 12,982
GSE CMOs    
Assets:    
Total debt securities available-for-sale 12,772 11,824
GSE certificates    
Assets:    
Total debt securities available-for-sale 951 999
Private label CMOs    
Assets:    
Total debt securities available-for-sale 152 159
Total other debt securities    
Assets:    
Total debt securities available-for-sale 2,678 2,719
GSE debentures    
Assets:    
Total debt securities available-for-sale 1,283 1,296
U. S. treasury obligations    
Assets:    
Total debt securities available-for-sale 999 1,017
Asset-backed securities    
Assets:    
Total debt securities available-for-sale 199 213
Corporate bonds    
Assets:    
Total debt securities available-for-sale 146 144
Municipal bonds and capital trust    
Assets:    
Total debt securities available-for-sale 51  
Municipal bonds, foreign notes, and capital trust    
Assets:    
Total debt securities available-for-sale   49
Total equity securities    
Assets:    
Total equity securities 14 65
Mutual funds and common stock    
Assets:    
Total equity securities 14 65
Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Total securities 999 1,068
Total assets at fair value 999 1,068
Liabilities:    
Total liabilities at fair value 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swaps    
Assets:    
Derivative assets: 0 0
Liabilities:    
Derivative liabilities: 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Rate lock commitments    
Assets:    
Derivative assets: 0 0
Liabilities:    
Derivative liabilities:   0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate caps    
Assets:    
Derivative assets: 0 0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities forwards    
Liabilities:    
Derivative liabilities: 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) | Residential first mortgage loans | Loans and leases held for investment:    
Assets:    
Loans held for sale:   0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial real estate    
Assets:    
Loans held for sale:   0
Quoted Prices in Active Markets for Identical Assets (Level 1) | Total debt securities available-for-sale    
Assets:    
Total debt securities available-for-sale 999 1,017
Quoted Prices in Active Markets for Identical Assets (Level 1) | Total mortgage-related debt securities    
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) | Total other debt securities    
Assets:    
Total debt securities available-for-sale 999 1,017
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 999 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 and capital trust    
Assets:    
Total debt securities available-for-sale 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
Quoted Prices in Active Markets for Identical Assets (Level 1) | Total equity securities    
Assets:    
Total equity securities 0 51
Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds and common stock    
Assets:    
Total equity securities 0 51
Significant Other Observable Inputs (Level 2)    
Assets:    
Total securities 15,546 14,675
Total assets at fair value 15,771 14,938
Liabilities:    
Total liabilities at fair value 23 22
Significant Other Observable Inputs (Level 2) | Interest rate swaps    
Assets:    
Derivative assets: 15 19
Liabilities:    
Derivative liabilities: 22 21
Significant Other Observable Inputs (Level 2) | Rate lock commitments    
Assets:    
Derivative assets: 0 0
Liabilities:    
Derivative liabilities:   0
Significant Other Observable Inputs (Level 2) | Interest rate caps    
Assets:    
Derivative assets: 2 3
Significant Other Observable Inputs (Level 2) | Mortgage-backed securities forwards    
Liabilities:    
Derivative liabilities: 1 1
Significant Other Observable Inputs (Level 2) | One-to-four family first mortgage    
Assets:    
Loans held for sale: 208  
Significant Other Observable Inputs (Level 2) | Residential first mortgage loans | Loans and leases held for investment:    
Assets:    
Loans held for sale:   193
Significant Other Observable Inputs (Level 2) | Commercial real estate    
Assets:    
Loans held for sale:   48
Significant Other Observable Inputs (Level 2) | Total debt securities available-for-sale    
Assets:    
Total debt securities available-for-sale 15,532 14,661
Significant Other Observable Inputs (Level 2) | Total mortgage-related debt securities    
Assets:    
Total debt securities available-for-sale 13,853 12,959
Significant Other Observable Inputs (Level 2) | GSE CMOs    
Assets:    
Total debt securities available-for-sale 12,772 11,824
Significant Other Observable Inputs (Level 2) | GSE certificates    
Assets:    
Total debt securities available-for-sale 951 999
Significant Other Observable Inputs (Level 2) | Private label CMOs    
Assets:    
Total debt securities available-for-sale 130 136
Significant Other Observable Inputs (Level 2) | Total other debt securities    
Assets:    
Total debt securities available-for-sale 1,679 1,702
Significant Other Observable Inputs (Level 2) | GSE debentures    
Assets:    
Total debt securities available-for-sale 1,283 1,296
Significant Other Observable Inputs (Level 2) | U. S. treasury obligations    
Assets:    
Total debt securities available-for-sale 0 0
Significant Other Observable Inputs (Level 2) | Asset-backed securities    
Assets:    
Total debt securities available-for-sale 199 213
Significant Other Observable Inputs (Level 2) | Corporate bonds    
Assets:    
Total debt securities available-for-sale 146 144
Significant Other Observable Inputs (Level 2) | Municipal bonds and capital trust    
Assets:    
Total debt securities available-for-sale 51  
Significant Other Observable Inputs (Level 2) | Municipal bonds, foreign notes, and capital trust    
Assets:    
Total debt securities available-for-sale   49
Significant Other Observable Inputs (Level 2) | Total 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 22 23
Total assets at fair value 24 27
Liabilities:    
Total liabilities at fair value 0 1
Significant Unobservable Inputs (Level 3) | Interest rate swaps    
Assets:    
Derivative assets: 0 0
Liabilities:    
Derivative liabilities: 0 0
Significant Unobservable Inputs (Level 3) | Rate lock commitments    
Assets:    
Derivative assets: 2 4
Liabilities:    
Derivative liabilities:   1
Significant Unobservable Inputs (Level 3) | Interest rate caps    
Assets:    
Derivative assets: 0 0
Significant Unobservable Inputs (Level 3) | Mortgage-backed securities forwards    
Liabilities:    
Derivative liabilities: 0 0
Significant Unobservable Inputs (Level 3) | One-to-four family first mortgage    
Assets:    
Loans held for sale: 0  
Significant Unobservable Inputs (Level 3) | Residential first mortgage loans | Loans and leases held for investment:    
Assets:    
Loans held for sale:   0
Significant Unobservable Inputs (Level 3) | Commercial real estate    
Assets:    
Loans held for sale:   0
Significant Unobservable Inputs (Level 3) | Total debt securities available-for-sale    
Assets:    
Total debt securities available-for-sale 22 23
Significant Unobservable Inputs (Level 3) | Total mortgage-related debt securities    
Assets:    
Total debt securities available-for-sale 22 23
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 22 23
Significant Unobservable Inputs (Level 3) | Total other debt securities    
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 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 and capital trust    
Assets:    
Total debt securities available-for-sale 0  
Significant Unobservable Inputs (Level 3) | Municipal bonds, foreign notes, and capital trust    
Assets:    
Total debt securities available-for-sale   0
Significant Unobservable Inputs (Level 3) | Total equity securities    
Assets:    
Total equity securities 0 0
Significant Unobservable Inputs (Level 3) | Mutual funds and common stock    
Assets:    
Total equity securities $ 0 $ 0