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Fair Value Measurements - Additional Information (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2022
Mar. 31, 2021
Dec. 31, 2021
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Unfunded commitments, equity securities measured at net asset value $ 29   $ 29
Revaluation period 90 days    
Deferred fees $ 4   4
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Transfers Out of Level 3 89 $ 16  
Fair Value Liability, Transfers Into Level 3 255 2  
Level 3 | Equity contracts      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Derivatives, net, Transfers out of Level 3 43 (1)  
Derivatives, net, Transfers into Level 3 29 0  
Unfunded Loan Commitment      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Deferred fees 155   $ 151
Deposits | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Transfers Out of Level 3 3 15  
Fair Value Liability, Transfers Into Level 3 49 0  
Fixed rate long-term debt | Level 3      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Transfers Out of Level 3 86 1  
Fair Value Liability, Transfers Into Level 3 $ 206 $ 2