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Accounting Policies (Details) $ in Millions | Jun. 01, 2021 USD ($) | Dec. 31, 2023 USD ($) office | Dec. 31, 2022 USD ($) | Dec. 31, 2021 USD ($) | Oct. 12, 2021 state branch customer employee | Dec. 31, 2020 USD ($)
--- | --- | --- | --- | --- | --- | ---
Number of international offices | office |  | 4 |  |  |  |
Number of customers converted | customer |  |  |  |  | 2,600,000 |
Number of employees converted | employee |  |  |  |  | 9,000 |
Number of branches converted | branch |  |  |  |  | 600 |
Number of states converted | state |  |  |  |  | 7 |
Allowance for loan and lease losses |  | $ (4,791) | $ (4,741) | $ (4,868) |  | $ (5,361)
Retained earnings |  | $ 56,290 | 53,572 |  |  |
BBVA USA Bancshares, Inc. |  |  |  |  |  |
Business combination, consideration transferred | $ 11,500 |  |  |  |  |
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |  |
Allowance for loan and lease losses |  |  | 35 |  |  |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update 2022-02 |  |  |  |  |  |
Allowance for loan and lease losses |  |  | 35 |  |  |
Retained earnings |  |  | $ 26 |  |  |
Minimum | Furniture and Equipment |  |  |  |  |  |
Estimated useful life of property and equipment |  | 1 year |  |  |  |
Minimum | Software and Software Development Costs |  |  |  |  |  |
Estimated useful life of property and equipment |  | 1 year |  |  |  |
Maximum | Furniture and Equipment |  |  |  |  |  |
Estimated useful life of property and equipment |  | 10 years |  |  |  |
Maximum | Buildings |  |  |  |  |  |
Estimated useful life of property and equipment |  | 40 years |  |  |  |
Maximum | Leasehold Improvements |  |  |  |  |  |
Estimated useful life of property and equipment |  | 15 years |  |  |  |
Maximum | Software and Software Development Costs |  |  |  |  |  |
Estimated useful life of property and equipment |  | 10 years |  |  |  |

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