Commitments and Contingencies - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022
Loss Contingencies [Line Items]
Repurchase Reserve	$ 79	$ 22
Litigation and Regulatory Matters
Loss Contingencies [Line Items]
Legal fees	39	$ 23
Min | Litigation and Regulatory Matters
Loss Contingencies [Line Items]
Reasonably possible loss	1
Max | Litigation and Regulatory Matters
Loss Contingencies [Line Items]
Reasonably possible loss	$ 3