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Other Assets (Details Textuals) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Other Assets [Line Items] |  |  |
Accumulated goodwill impairment losses | $ 221 | $ 221 |
Gross carrying amount | 759 | 704 |
Accumulated amortization | 494 | 437 |
Amortization expense | 54 | 49 | $ 212
Tax credit investments | 1,147 | 1,154 |
Tax credit investments - Affordable Housing partnerships | $ 1,095 | 1,109 |
Minimum [Member] |  |  |
Other Assets [Line Items] |  |  |
Estimated useful lives | 1 year |  |
Maximum [Member] |  |  |
Other Assets [Line Items] |  |  |
Estimated useful lives | 22 years |  |
Other Expense [Member] |  |  |
Other Assets [Line Items] |  |  |
Equity method losses related to QAH investments | $ 128 | 101 | 126
Income Tax Provision [Member] |  |  |
Other Assets [Line Items] |  |  |
QAH Tax Credits for equity method losses | 129 | 119 | $ 97
Other Liabilities [Member] |  |  |
Other Assets [Line Items] |  |  |
QAH unfunded commitment | 208 |  |
Variable Interest Entity, Primary Beneficiary [Member] |  |  |
Other Assets [Line Items] |  |  |
Tax credit investments - Affordable Housing partnerships | 1,028 | $ 1,032 |
Affordable Housing Program off balance sheet obligation | 106 |  |
Variable Interest Entity, Primary Beneficiary [Member] | Other Liabilities [Member] |  |  |
Other Assets [Line Items] |  |  |
QAH unfunded commitment | $ 189 |  |
Latest Year [Member] | Other Liabilities [Member] |  |  |
Other Assets [Line Items] |  |  |
Affordable housing tax credits commitment, year to be paid | 2035 |  |
Earliest Year [Member] | Other Liabilities [Member] |  |  |
Other Assets [Line Items] |  |  |
Affordable housing tax credits commitment, year to be paid | 2021 |  |

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