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Other Assets (Details Textuals) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2021 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Other Assets [Line Items] |  |  |  |
Accumulated goodwill impairment losses |  | $ 221 | $ 221 |
Gross carrying amount |  | 733 | 759 |
Accumulated amortization |  | 532 | 494 |
Amortization expense |  | 57 | 54 | $ 49
Tax credit investments |  | 1,124 | 1,147 |
Tax credit investments - Affordable Housing partnerships |  | 1,084 | 1,095 |
Income tax provision |  | 2,629 | 1,161 | 1,670
Expected amortization expense in 2022 |  | 52 |  |
Expected amortization expense in 2023 |  | 50 |  |
Expected amortization expense in 2024 |  | 44 |  |
Expected amortization expense in 2025 |  | 21 |  |
Expected amortization expense in 2026 |  | 11 |  |
Expected amortization expense after 2026 |  | $ 23 |  |
Cumulative Effect, Period of Adoption, Adjustment | Accounting Standards Update, Number 2014-01 |  |  |  |
Other Assets [Line Items] |  |  |  |
Income tax provision | $ 55 |  |  |
Minimum |  |  |  |
Other Assets [Line Items] |  |  |  |
Estimated useful lives |  | 1 year |  |
Maximum |  |  |  |
Other Assets [Line Items] |  |  |  |
Estimated useful lives |  | 22 years |  |
Other Expense |  |  |  |
Other Assets [Line Items] |  |  |  |
QAH investment losses |  | $ 226 |  |
Equity method losses related to QAH investments |  |  | 128 | 101
Income Tax Provision |  |  |  |
Other Assets [Line Items] |  |  |  |
QAH Tax Credits for equity method losses |  | 135 | 129 | $ 119
Other Liabilities |  |  |  |
Other Assets [Line Items] |  |  |  |
QAH unfunded commitment |  | 238 |  |
Variable Interest Entity, Primary Beneficiary |  |  |  |
Other Assets [Line Items] |  |  |  |
Tax credit investments - Affordable Housing partnerships |  | 994 | $ 1,028 |
Variable Interest Entity, Primary Beneficiary | Off-Balance Sheet Obligations |  |  |  |
Other Assets [Line Items] |  |  |  |
Affordable Housing Program off balance sheet obligation |  | 53 |  |
Variable Interest Entity, Primary Beneficiary | Other Liabilities |  |  |  |
Other Assets [Line Items] |  |  |  |
QAH unfunded commitment |  | $ 192 |  |
Earliest Year | Other Liabilities |  |  |  |
Other Assets [Line Items] |  |  |  |
Affordable housing tax credits commitment, year to be paid |  | 2022 |  |
Latest Year | Other Liabilities |  |  |  |
Other Assets [Line Items] |  |  |  |
Affordable housing tax credits commitment, year to be paid |  | 2036 |  |

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