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Fair Value Measurements - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Unfunded commitments, equity securities measured at net asset value $ 21   $ 21
Revaluation period 90 days    
Deferred fee income $ 3   3
Unfunded Loan Commitment      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Deferred fee income 165   $ 162
Level 3      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Transfers Out of Level 3 135 $ 428  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 (13) (1)  
Level 3 | Long-term debt      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Transfers Out of Level 3 128 403  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 (13) (1)  
Level 3 | Deposits      
Fair Value, Assets and Liabilities Measured on Recurring Basis [Line Items]      
Transfers Out of Level 3 7 25  
Fair Value, Measurement with Unobservable Inputs Reconciliation, Liability, Transfers Into Level 3 $ 0 $ 0