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Fair Value (Nonrecurring Fair Value Measurements) (Details) - Fair Value, Nonrecurring - Level 3 - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended |
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Jun. 30, 2022 | Jun. 30, 2021 | Jun. 30, 2022 | Jun. 30, 2021 | Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | $ 224 |  | $ 224 |  | $ 457
Nonrecurring Assets - Gains (Losses) | (21) | $ (4) | (33) | $ (15) |
Nonaccrual loans |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 159 |  | 159 |  | 348
Nonrecurring Assets - Gains (Losses) | (19) | 5 | (28) | (4) |
Equity investments |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 48 |  | 48 |  |
Nonrecurring Assets - Gains (Losses) | 1 |  |  |  |
OREO and foreclosed assets |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 8 |  | 8 |  | 6
Nonrecurring Assets - Gains (Losses) |  |  |  |  |
Long-lived assets |  |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |  |
Nonrecurring Assets - Fair Value | 9 |  | 9 |  | $ 103
Nonrecurring Assets - Gains (Losses) | $ (3) | $ (9) | $ (5) | $ (11) |

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- Definition Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=123874694&loc=d3e19207-110258 + Details
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