INCOME TAXES - Schedule of Unrecognized Tax Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of period	$ 31	$ 30	$ 31
Additions for tax positions related to current year	8	0	0
Additions for tax positions related to prior years	48	5	1
Reductions for tax positions of prior years	0	0	(2)
Expiration of statutes of limitations	(1)	(2)	(1)
Settlements	0	(2)	(5)
Balance at end of period	86	31	30
CIT Group Inc.
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Effect of CIT Merger	0	0	$ 6
Liabilities for Unrecognized Tax Benefits
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of period	28
Additions for tax positions related to current year	8
Additions for tax positions related to prior years	42
Reductions for tax positions of prior years	0
Expiration of statutes of limitations	(1)
Settlements	0
Balance at end of period	77	28
Liabilities for Unrecognized Tax Benefits | CIT Group Inc.
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Effect of CIT Merger	0
Interest / Penalties
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of period	3
Additions for tax positions related to current year	0
Additions for tax positions related to prior years	6
Reductions for tax positions of prior years	0
Expiration of statutes of limitations	0
Settlements	0
Balance at end of period	9	$ 3
Interest / Penalties | CIT Group Inc.
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Effect of CIT Merger	$ 0