Fresh Start Accounting - Narrative (Details) $ in Millions	9 Months Ended
	Sep. 30, 2023 reportingUnit	Aug. 11, 2023 USD ($)
Reorganization, Chapter 11 [Line Items]
Enterprise value		$ 2,150.0
Internal Rate of Return (IRR)		18.90%
Number of Reporting Units | reportingUnit	2
Global Banking
Reorganization, Chapter 11 [Line Items]
Reporting Unit, Measurement Input		0.190
Global Retail [Member]
Reorganization, Chapter 11 [Line Items]
Reporting Unit, Measurement Input		0.190
Minimum
Reorganization, Chapter 11 [Line Items]
Enterprise value		$ 2,150.0
Maximum
Reorganization, Chapter 11 [Line Items]
Enterprise value		$ 2,450.0