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Allowance for Credit Losses - Narrative (Details)
$ in Millions
12 Months Ended
Dec. 31, 2023
USD ($)
scenario
Dec. 31, 2022
USD ($)
Dec. 31, 2021
USD ($)
Credit Loss [Abstract]      
Number of updated forward-looking economic scenarios | scenario 4    
Charge-off of accrued interest receivables | $ $ 14 $ 3 $ 5