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Commitments, Contingent Liabilities and Guarantees (Tables) | 12 Months Ended
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Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract] |
Commitments to Extend Credit or Funding | The following table shows the remaining contractual amount of each class of commitment related to extending credit or funding principal investments as of December 31, 2019, and December 31, 2018. For loan commitments and commercial letters of credit, this amount represents our maximum possible accounting loss on the unused commitment if the borrower were to draw upon the full amount of the commitment and subsequently default on payment for the total amount of the then outstanding loan.
December 31, in millions | 2019 | 2018
Loan commitments: |  |
Commercial and other | $ | 45,323 |  | $ | 42,653 |
Commercial real estate and construction | 2,961 |  | 2,691 |
Home equity | 9,945 |  | 9,982 |
Credit cards | 6,560 |  | 6,152 |
Total loan commitments | 64,789 |  | 61,478 |
Commercial letters of credit | 91 |  | 86 |
Purchase card commitments | 729 |  | 621 |
Principal investing commitments | 21 |  | 26 |
Tax credit investment commitments | 547 |  | 520 |
Total loan and other commitments | $ | 66,177 |  | $ | 62,731 |
Guarantees | The following table shows the types of guarantees that we had outstanding at December 31, 2019. Information pertaining to the basis for determining the liabilities recorded in connection with these guarantees is included in Note 1 (“Summary of Significant Accounting Policies”) under the heading “Contingencies and Guarantees.”
December 31, 2019 | Maximum Potential Undiscounted Future Payments | Liability Recorded
in millions
Financial guarantees: |  |
Standby letters of credit | $ | 3,303 |  | $ | 72 |
Recourse agreement with FNMA | 4,862 |  | 7 |
Residential mortgage reserve | 1,825 |  | 7 |
Written put options (a) | 2,446 |  | 32 |
Total | $ | 12,436 |  | $ | 118 |
(a) The maximum potential undiscounted future payments represent notional amounts of derivatives qualifying as guarantees.

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- Definition Tabular disclosure of each guarantee obligation, or each group of similar guarantee obligations, including (a) the nature of the guarantee, including its term, how it arose, and the events or circumstances that would require the guarantor to perform under the guarantee; (b) the maximum potential amount of future payments (undiscounted) the guarantor could be required to make under the guarantee; (c) the current carrying amount of the liability, if any, for the guarantor's obligations under the guarantee; and (d) the nature of any recourse provisions under the guarantee, and any assets held either as collateral or by third parties, and any relevant related party disclosure. Excludes disclosures about product warranties. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12069-110248 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=118943654&loc=d3e12265-110248 + Details
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