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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
Jun. 30, 2021
Dec. 31, 2020
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Certain nonaccrual loans $ 31 [1] $ 41 [2]
Other assets 11 [3] 6 [4]
Total 42 47
Significant Unobservable Inputs (Level 3)    
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]    
Certain nonaccrual loans 31 [1] 41 [2]
Other assets 11 [3] 6 [4]
Total $ 42 $ 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.