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Fair Value Measurements - Summary of Carrying Values, Estimated Fair Values and Fair Value Measurement Levels of Financial Instruments (Details) - Fair Value, Measurements, Nonrecurring - USD ($) $ in Millions | Sep. 30, 2021 | Dec. 31, 2020
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Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Certain nonaccrual loans | $ 30 | [1] | $ 41 | [2]
Other assets | 32 | [3] | 6 | [4]
Total | 62 |  | 47 |
Significant Unobservable Inputs (Level 3) |  |  |  |
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items] |  |  |  |
Certain nonaccrual loans | 30 | [1] | 41 | [2]
Other assets | 32 | [3] | 6 | [4]
Total | $ 62 |  | $ 47 |
[1] | Represents the fair value of impaired loans, based on the value of the collateral.
[2] | Represents the fair value of impaired loans, based on the value of the collateral.
[3] | Represents the fair value of repossessed assets, based on the appraised value of the collateral subsequent to its initial classification as repossessed assets and equity investments without readily determinable fair values. These equity investments are classified as Level 3 due to the infrequency of the observable prices and/or the restrictions on the shares.
[4] | Represents the fair value of repossessed assets, based on the appraised value of the collateral subsequent to its initial classification as repossessed assets and equity investments without readily determinable fair values. These equity investments are classified as Level 3 due to the infrequency of the observable prices and/or the restrictions on the shares.

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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=117815213&loc=d3e19207-110258 + Details
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