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Fair Value of Assets and Liabilities - Nonrecurring Fair Value Measurements (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans held-for-sale | $ 258 | $ 405 |
Non Recurring |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans, net of unearned income | 84 | 77 | $ 42
Other real estate owned (OREO) | 3 | 15 | 16
Other assets | 30 | 9 | 11
Net gains (losses) loans, net of unearned income | (13) | (12) | (7)
Net gains (losses) other real estate owned | (1) | (1) | (1)
Net gains (losses) other assets | (2) | (2) | (2)
Net gains (losses) financial assets | (18) | (18) | (12)
Non Recurring | SBAs and USDA |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans held-for-sale | 853 | 509 | 494
Net gains (losses) loans held-for-sale | (2) | (3) | (2)
Non Recurring | First Mortgages |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans held-for-sale | 1 | 1 | 1
Net gains (losses) loans held-for-sale | 0 | 0 | 0
Non Recurring | Level 1 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans, net of unearned income | 0 | 0 | 0
Other real estate owned (OREO) | 0 | 0 | 0
Other assets | 0 | 0 | 0
Non Recurring | Level 1 | SBAs and USDA |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans held-for-sale | 0 | 0 | 0
Non Recurring | Level 1 | First Mortgages |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans held-for-sale | 0 | 0 | 0
Non Recurring | Level 2 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans, net of unearned income | 0 | 0 | 0
Other real estate owned (OREO) | 0 | 0 | 0
Other assets | 0 | 0 | 0
Non Recurring | Level 2 | SBAs and USDA |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans held-for-sale | 852 | 508 | 493
Non Recurring | Level 2 | First Mortgages |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans held-for-sale | 0 | 0 | 0
Non Recurring | Level 3 |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans, net of unearned income | 84 | 77 | 42
Other real estate owned (OREO) | 3 | 15 | 16
Other assets | 30 | 9 | 11
Non Recurring | Level 3 | SBAs and USDA |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans held-for-sale | 1 | 1 | 1
Non Recurring | Level 3 | First Mortgages |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |
Loans held-for-sale | $ 1 | $ 1 | $ 1

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- Definition Amount before allowance and after deduction of deferred interest and fees, unamortized costs and premiums and discounts from face amounts, of loans and leases held in portfolio, including but not limited to, commercial and consumer loans. Excludes loans and leases covered under loss sharing agreements. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=124259787&loc=d3e4428-111522 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 310 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=123577603&loc=d3e5074-111524 + Details
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