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Fair Value Measures - Financial Instruments Carried at Fair Value (Details) - USD ($)
$ in Millions
Sep. 30, 2024
Dec. 31, 2023
Assets:    
Loans held for sale $ 1,595 $ 902
Mortgage servicing rights 0 1,111
Total debt securities available for sale    
Assets:    
Total debt securities available for sale 10,511 9,145
Total mortgage-related debt securities    
Assets:    
Total debt securities available for sale 8,525 6,563
GSE certificates    
Assets:    
Total debt securities available for sale 1,175 1,221
GSE collateralized mortgage obligations    
Assets:    
Total debt securities available for sale 7,178 5,162
Private label collateralized mortgage obligations    
Assets:    
Total debt securities available for sale 172 180
Total other debt securities    
Assets:    
Total debt securities available for sale 1,986 2,582
U. S. Treasury obligations    
Assets:    
Total debt securities available for sale   198
GSE debentures    
Assets:    
Total debt securities available for sale 1,254 1,609
Asset-backed securities    
Assets:    
Total debt securities available for sale 243 302
Municipal bonds    
Assets:    
Total debt securities available for sale 6 6
Corporate bonds    
Assets:    
Total debt securities available for sale 357 343
Foreign notes    
Assets:    
Total debt securities available for sale 35 34
Capital trust notes    
Assets:    
Total debt securities available for sale 91 90
Recurring    
Assets:    
Total securities 10,525 9,159
Mortgage servicing rights 1,105 1,111
Total assets at fair value 13,332 11,310
Liabilities:    
Total liabilities at fair value 46 95
Recurring | Acquisition, development, and construction    
Assets:    
Loans held for sale 178 123
Recurring | Commercial and industrial    
Assets:    
Loans held for sale 18 9
Recurring | Loans and Leases Held for Investment: | Residential first mortgage loans    
Assets:    
Loans held for sale 1,399 770
Loans held-for-investment 67  
Recurring | Interest rate swaps and swaptions    
Assets:    
Derivative assets 23 115
Liabilities:    
Derivative liabilities 31 59
Recurring | Futures    
Liabilities:    
Derivative liabilities   1
Recurring | Rate lock commitments    
Assets:    
Derivative assets 11 12
Liabilities:    
Derivative liabilities 3 3
Recurring | Mortgage-backed securities forwards    
Assets:    
Derivative assets 6 11
Liabilities:    
Derivative liabilities 12 32
Recurring | Total debt securities available for sale    
Assets:    
Total debt securities available for sale 10,511 9,145
Recurring | Total mortgage-related debt securities    
Assets:    
Total debt securities available for sale 8,525 6,563
Recurring | GSE certificates    
Assets:    
Total debt securities available for sale 1,175 1,221
Recurring | GSE collateralized mortgage obligations    
Assets:    
Total debt securities available for sale 7,178 5,162
Recurring | Private label collateralized mortgage obligations    
Assets:    
Total debt securities available for sale 172 180
Recurring | Total other debt securities    
Assets:    
Total debt securities available for sale 1,986 2,582
Recurring | U. S. Treasury obligations    
Assets:    
Total debt securities available for sale   198
Recurring | GSE debentures    
Assets:    
Total debt securities available for sale 1,254 1,609
Recurring | Asset-backed securities    
Assets:    
Total debt securities available for sale 243 302
Recurring | Municipal bonds    
Assets:    
Total debt securities available for sale 6 6
Recurring | Corporate bonds    
Assets:    
Total debt securities available for sale 357 343
Recurring | Foreign notes    
Assets:    
Total debt securities available for sale 35 34
Recurring | Capital trust notes    
Assets:    
Total debt securities available for sale 91 90
Recurring | Total equity securities    
Assets:    
Total equity securities 14 14
Recurring | Mutual funds and common stock    
Assets:    
Total equity securities 14 14
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1)    
Assets:    
Total securities 0 198
Mortgage servicing rights 0 0
Total assets at fair value 0 198
Liabilities:    
Total liabilities at fair value 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Acquisition, development, and construction    
Assets:    
Loans held for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Commercial and industrial    
Assets:    
Loans held for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Loans and Leases Held for Investment: | Residential first mortgage loans    
Assets:    
Loans held for sale 0 0
Loans held-for-investment 0  
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Interest rate swaps and swaptions    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Futures    
Liabilities:    
Derivative liabilities  
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Rate lock commitments    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mortgage-backed securities forwards    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Total debt securities available for sale    
Assets:    
Total debt securities available for sale 0 198
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Total mortgage-related debt securities    
Assets:    
Total debt securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | GSE certificates    
Assets:    
Total debt securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | GSE collateralized mortgage obligations    
Assets:    
Total debt securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Private label collateralized mortgage obligations    
Assets:    
Total debt securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Total other debt securities    
Assets:    
Total debt securities available for sale 0 198
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | U. S. Treasury obligations    
Assets:    
Total debt securities available for sale   198
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | GSE debentures    
Assets:    
Total debt securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Asset-backed securities    
Assets:    
Total debt securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Municipal bonds    
Assets:    
Total debt securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Corporate bonds    
Assets:    
Total debt securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Foreign notes    
Assets:    
Total debt securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Capital trust notes    
Assets:    
Total debt securities available for sale 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Total equity securities    
Assets:    
Total equity securities 0 0
Recurring | Quoted Prices in Active Markets for Identical Assets (Level 1) | Mutual funds and common stock    
Assets:    
Total equity securities 0 0
Recurring | Significant Other Observable Inputs (Level 2)    
Assets:    
Total securities 10,492 8,929
Mortgage servicing rights 0 0
Total assets at fair value 12,183 9,957
Liabilities:    
Total liabilities at fair value 43 92
Recurring | Significant Other Observable Inputs (Level 2) | Acquisition, development, and construction    
Assets:    
Loans held for sale 178 123
Recurring | Significant Other Observable Inputs (Level 2) | Commercial and industrial    
Assets:    
Loans held for sale 18 9
Recurring | Significant Other Observable Inputs (Level 2) | Loans and Leases Held for Investment: | Residential first mortgage loans    
Assets:    
Loans held for sale 1,399 770
Loans held-for-investment 67  
Recurring | Significant Other Observable Inputs (Level 2) | Interest rate swaps and swaptions    
Assets:    
Derivative assets 23 115
Liabilities:    
Derivative liabilities 31 59
Recurring | Significant Other Observable Inputs (Level 2) | Futures    
Liabilities:    
Derivative liabilities   1
Recurring | Significant Other Observable Inputs (Level 2) | Rate lock commitments    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0 0
Recurring | Significant Other Observable Inputs (Level 2) | Mortgage-backed securities forwards    
Assets:    
Derivative assets 6 11
Liabilities:    
Derivative liabilities 12 32
Recurring | Significant Other Observable Inputs (Level 2) | Total debt securities available for sale    
Assets:    
Total debt securities available for sale 10,478 8,915
Recurring | Significant Other Observable Inputs (Level 2) | Total mortgage-related debt securities    
Assets:    
Total debt securities available for sale 8,492 6,531
Recurring | Significant Other Observable Inputs (Level 2) | GSE certificates    
Assets:    
Total debt securities available for sale 1,175 1,221
Recurring | Significant Other Observable Inputs (Level 2) | GSE collateralized mortgage obligations    
Assets:    
Total debt securities available for sale 7,178 5,162
Recurring | Significant Other Observable Inputs (Level 2) | Private label collateralized mortgage obligations    
Assets:    
Total debt securities available for sale 139 148
Recurring | Significant Other Observable Inputs (Level 2) | Total other debt securities    
Assets:    
Total debt securities available for sale 1,986 2,384
Recurring | Significant Other Observable Inputs (Level 2) | U. S. Treasury obligations    
Assets:    
Total debt securities available for sale   0
Recurring | Significant Other Observable Inputs (Level 2) | GSE debentures    
Assets:    
Total debt securities available for sale 1,254 1,609
Recurring | Significant Other Observable Inputs (Level 2) | Asset-backed securities    
Assets:    
Total debt securities available for sale 243 302
Recurring | Significant Other Observable Inputs (Level 2) | Municipal bonds    
Assets:    
Total debt securities available for sale 6 6
Recurring | Significant Other Observable Inputs (Level 2) | Corporate bonds    
Assets:    
Total debt securities available for sale 357 343
Recurring | Significant Other Observable Inputs (Level 2) | Foreign notes    
Assets:    
Total debt securities available for sale 35 34
Recurring | Significant Other Observable Inputs (Level 2) | Capital trust notes    
Assets:    
Total debt securities available for sale 91 90
Recurring | Significant Other Observable Inputs (Level 2) | Total equity securities    
Assets:    
Total equity securities 14 14
Recurring | Significant Other Observable Inputs (Level 2) | Mutual funds and common stock    
Assets:    
Total equity securities 14 14
Recurring | Significant Unobservable Inputs (Level 3)    
Assets:    
Total securities 33 32
Mortgage servicing rights 1,105 1,111
Total assets at fair value 1,149 1,155
Liabilities:    
Total liabilities at fair value 3 3
Recurring | Significant Unobservable Inputs (Level 3) | Acquisition, development, and construction    
Assets:    
Loans held for sale 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Commercial and industrial    
Assets:    
Loans held for sale 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Loans and Leases Held for Investment: | Residential first mortgage loans    
Assets:    
Loans held for sale 0 0
Loans held-for-investment 0  
Recurring | Significant Unobservable Inputs (Level 3) | Interest rate swaps and swaptions    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Futures    
Liabilities:    
Derivative liabilities  
Recurring | Significant Unobservable Inputs (Level 3) | Rate lock commitments    
Assets:    
Derivative assets 11 12
Liabilities:    
Derivative liabilities 3 3
Recurring | Significant Unobservable Inputs (Level 3) | Mortgage-backed securities forwards    
Assets:    
Derivative assets 0 0
Liabilities:    
Derivative liabilities 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Total debt securities available for sale    
Assets:    
Total debt securities available for sale 33 32
Recurring | Significant Unobservable Inputs (Level 3) | Total mortgage-related debt securities    
Assets:    
Total debt securities available for sale 33 32
Recurring | Significant Unobservable Inputs (Level 3) | GSE certificates    
Assets:    
Total debt securities available for sale 0 0
Recurring | Significant Unobservable Inputs (Level 3) | GSE collateralized mortgage obligations    
Assets:    
Total debt securities available for sale 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Private label collateralized mortgage obligations    
Assets:    
Total debt securities available for sale 33 32
Recurring | Significant Unobservable Inputs (Level 3) | Total other debt securities    
Assets:    
Total debt securities available for sale 0 0
Recurring | Significant Unobservable Inputs (Level 3) | U. S. Treasury obligations    
Assets:    
Total debt securities available for sale   0
Recurring | Significant Unobservable Inputs (Level 3) | GSE debentures    
Assets:    
Total debt securities available for sale 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Asset-backed securities    
Assets:    
Total debt securities available for sale 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Municipal bonds    
Assets:    
Total debt securities available for sale 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Corporate bonds    
Assets:    
Total debt securities available for sale 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Foreign notes    
Assets:    
Total debt securities available for sale 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Capital trust notes    
Assets:    
Total debt securities available for sale 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Total equity securities    
Assets:    
Total equity securities 0 0
Recurring | Significant Unobservable Inputs (Level 3) | Mutual funds and common stock    
Assets:    
Total equity securities $ 0 $ 0