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Other Assets (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Other Assets [Line Items] |  |  |
Accumulated goodwill impairment losses | $ 221 | $ 221 |
Gross carrying amount | 717 | 720 |
Accumulated amortization | 619 | 574 |
Amortization expense | 49 | 51 | $ 57
Expected amortization expense in 2024 | 44 |  |
Expected amortization expense in 2025 | 21 |  |
Expected amortization expense in 2026 | 11 |  |
Expected amortization expense in 2027 | 9 |  |
Expected amortization expense in 2028 | 4 |  |
Expected amortization expense thereafter | 8 |  |
Tax credit investments | 1,369 | 1,207 |
Tax credit investments unfunded commitment | $ 573 |  |
Earliest Year |  |  |
Other Assets [Line Items] |  |  |
Tax credit investments commitment, year to be paid | 2024 |  |
Latest Year |  |  |
Other Assets [Line Items] |  |  |
Tax credit investments commitment, year to be paid | 2040 |  |
Variable Interest Entity, Primary Beneficiary |  |  |
Other Assets [Line Items] |  |  |
Tax credit investments | $ 1,126 | $ 1,042 |
Tax credit investments unfunded commitment | 409 |  |
Variable Interest Entity, Primary Beneficiary | Off-Balance Sheet Obligations |  |  |
Other Assets [Line Items] |  |  |
Tax credit investments off balance sheet obligation | $ 3 |  |
Minimum |  |  |
Other Assets [Line Items] |  |  |
Estimated useful lives | 1 year |  |
Maximum |  |  |
Other Assets [Line Items] |  |  |
Estimated useful lives | 22 years |  |

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