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Loans and Leases - Loans Held for Investment by Credit Quality Indicator - Amortized Basis (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
2023 | $ 12,297 |
2022 | 17,429 |
2021 | 12,633 |
2020 | 10,359 |
2019 | 6,635 |
Prior To 2019 | 13,920 |
Revolving Loans | 10,900 |
Revolving Loans Converted to Term Loans | 446 |
Total | 84,619 | $ 69,001
Current-period gross write-offs |  |
Current-period gross write-offs | 223 | 7
Other |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 27,911 | 14,528
Mortgage Loans |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
2023 | 2,577 |
2022 | 13,610 |
2021 | 10,635 |
2020 | 9,181 |
2019 | 5,678 |
Prior To 2019 | 12,921 |
Revolving Loans | 1,995 |
Revolving Loans Converted to Term Loans | 111 |
Total | 56,708 | 54,473
Current-period gross write-offs |  |
2023 | 0 |
2022 | (112) |
2021 | 0 |
2020 | 0 |
2019 | (2) |
Prior To 2019 | (64) |
Revolving Loans | 0 |
Revolving Loans Converted to Term Loans | 0 |
Current-period gross write-offs | 178 | 5
Mortgage Loans | Pass |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
2023 | 2,532 |
2022 | 13,295 |
2021 | 10,308 |
2020 | 8,438 |
2019 | 4,725 |
Prior To 2019 | 9,670 |
Revolving Loans | 1,981 |
Revolving Loans Converted to Term Loans | 108 |
Total | 51,057 | 52,195
Mortgage Loans | Special mention |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
2023 | 0 |
2022 | 217 |
2021 | 69 |
2020 | 407 |
2019 | 144 |
Prior To 2019 | 341 |
Revolving Loans | 14 |
Revolving Loans Converted to Term Loans | 0 |
Total | 1,192 | 1,106
Mortgage Loans | Substandard |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
2023 | 45 |
2022 | 98 |
2021 | 258 |
2020 | 336 |
2019 | 809 |
Prior To 2019 | 2,910 |
Revolving Loans | 0 |
Revolving Loans Converted to Term Loans | 3 |
Total | 4,459 | 1,172
Mortgage Loans | Doubtful |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
2023 | 0 |
2022 | 0 |
2021 | 0 |
2020 | 0 |
2019 | 0 |
Prior To 2019 | 0 |
Revolving Loans | 0 |
Revolving Loans Converted to Term Loans | 0 |
Total | 0 |
Mortgage Loans | Multi-family |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 37,265 | 38,130
Mortgage Loans | Multi-family | Pass |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 34,170 | 36,622
Mortgage Loans | Multi-family | Special mention |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 768 | 864
Mortgage Loans | Multi-family | Substandard |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 2,327 | 644
Mortgage Loans | Multi-family | Doubtful |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 0 |
Mortgage Loans | Commercial real estate |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 10,470 | 8,526
Mortgage Loans | Commercial real estate | Pass |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 8,734 | 7,871
Mortgage Loans | Commercial real estate | Special mention |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 367 | 230
Mortgage Loans | Commercial real estate | Substandard |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 1,369 | 425
Mortgage Loans | Commercial real estate | Doubtful |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 0 |
Mortgage Loans | One-to-four family first mortgage |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 6,061 | 5,821
Mortgage Loans | One-to-four family first mortgage | Pass |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 5,328 | 5,710
Mortgage Loans | One-to-four family first mortgage | Special mention |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 0 | 8
Mortgage Loans | One-to-four family first mortgage | Substandard |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 733 | 103
Mortgage Loans | One-to-four family first mortgage | Doubtful |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 0 |
Mortgage Loans | Acquisition, development, and construction |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 2,912 | 1,996
Mortgage Loans | Acquisition, development, and construction | Pass |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 2,825 | 1,992
Mortgage Loans | Acquisition, development, and construction | Special mention |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 57 | 4
Mortgage Loans | Acquisition, development, and construction | Substandard |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 30 | 0
Mortgage Loans | Acquisition, development, and construction | Doubtful |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 0 |
Other Loans: |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
2023 | 9,720 |
2022 | 3,819 |
2021 | 1,998 |
2020 | 1,178 |
2019 | 957 |
Prior To 2019 | 999 |
Revolving Loans | 8,905 |
Revolving Loans Converted to Term Loans | 335 |
Total | 27,911 | 14,528
Current-period gross write-offs |  |
2023 | (2) |
2022 | (10) |
2021 | (5) |
2020 | (8) |
2019 | (2) |
Prior To 2019 | (18) |
Revolving Loans | 0 |
Revolving Loans Converted to Term Loans | 0 |
Current-period gross write-offs | 45 | 2
Other Loans: | Pass |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
2023 | 9,709 |
2022 | 3,598 |
2021 | 1,936 |
2020 | 1,141 |
2019 | 911 |
Prior To 2019 | 941 |
Revolving Loans | 8,757 |
Revolving Loans Converted to Term Loans | 324 |
Total | 27,317 | 14,446
Other Loans: | Special mention |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
2023 | 1 |
2022 | 182 |
2021 | 17 |
2020 | 9 |
2019 | 6 |
Prior To 2019 | 18 |
Revolving Loans | 102 |
Revolving Loans Converted to Term Loans | 0 |
Total | 335 | 18
Other Loans: | Substandard |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
2023 | 10 |
2022 | 39 |
2021 | 45 |
2020 | 28 |
2019 | 40 |
Prior To 2019 | 40 |
Revolving Loans | 46 |
Revolving Loans Converted to Term Loans | 11 |
Total | 259 | 64
Other Loans: | Doubtful |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
2023 | 0 |
2022 | 0 |
2021 | 0 |
2020 | 0 |
2019 | 0 |
Prior To 2019 | 0 |
Revolving Loans | 0 |
Revolving Loans Converted to Term Loans | 0 |
Total | 0 |
Other Loans: | Commercial and industrial loans and lease financing |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 25,254 | 12,276
Other Loans: | Commercial and industrial loans and lease financing | Pass |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 24,683 | 12,208
Other Loans: | Commercial and industrial loans and lease financing | Special mention |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 335 | 18
Other Loans: | Commercial and industrial loans and lease financing | Substandard |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 236 | 50
Other Loans: | Commercial and industrial loans and lease financing | Doubtful |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 0 |
Other Loans: | Other |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 2,657 | 2,252
Other Loans: | Other | Pass |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 2,634 | 2,238
Other Loans: | Other | Special mention |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 0 | 0
Other Loans: | Other | Substandard |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | 23 | $ 14
Other Loans: | Other | Doubtful |  |
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss, by Origination Year [Abstract] |  |
Total | $ 0 |

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