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Arrangements with Off-Balance Sheet Risk - Schedule of Guarantor Obligations (Details) - USD ($)
$ in Millions
Jun. 30, 2024
Dec. 31, 2023
Dec. 31, 2022
Contingent repurchase commitments      
Guarantor Obligations [Line Items]      
Maximum Potential Payments $ 388 $ 404 $ 514
Estimated Proceeds from Collateral/Recourse 388 404 514
Credit guarantees      
Guarantor Obligations [Line Items]      
Maximum Potential Payments $ 15 15 45
Carrying Amount of  Liabilities   $ 14 $ 27