Consolidated Statements of Cash Flows (Unaudited) - USD ($) $ in Millions	6 Months Ended
	Jun. 30, 2025	Jun. 30, 2024
Cash flows from operating activities
Net income	$ 11	$ 109
Adjustments to reconcile net income to net cash provided by operating activities:
Goodwill and acquired intangible asset impairment and amortization expense	2	5
Stock-based compensation expense	12	12
Mark-to-market (gains) losses on derivative and hedging activities, net	93	(30)
Provisions for loan losses	67	26
Decrease in accrued interest receivable	72	276
Increase (decrease) in accrued interest payable	(4)	12
(Increase) decrease in other assets	(3)	79
(Decrease) in other liabilities	(53)	(28)
Total adjustments	186	352
Net cash provided by operating activities	197	461
Cash flows from investing activities
Education loans originated and acquired	(1,103)	(610)
Proceeds from payments on education loans	2,460	6,200
Other investing activities, net	24	8
Disposal of subsidiaries, net of cash and restricted cash disposed of	25	0
Net cash provided by investing activities	1,406	5,598
Cash flows from financing activities
Borrowings collateralized by loans in trust - issued	1,081	1,106
Borrowings collateralized by loans in trust - repaid	(2,430)	(5,154)
Long-term unsecured notes issued	495	0
Long-term unsecured notes repaid	(554)	(7)
Other financing activities, net	30	(53)
Common stock repurchased	(59)	(81)
Common dividends paid	(32)	(35)
Net cash used in financing activities	(1,629)	(4,846)
Net increase (decrease) in cash, cash equivalents, restricted cash and restricted cash equivalents	(26)	1,213
Cash, cash equivalents, restricted cash and restricted cash equivalents at beginning of period	2,103	2,793
Cash, cash equivalents, restricted cash and restricted cash equivalents at end of period	2,077	4,006
Supplemental disclosure of cash flow information:
Interest paid	1,314	1,680
Income taxes paid	1	30
Income taxes refunds received	0	(1)
Reconciliation of the Consolidated Statements of Cash Flows to the Consolidated Balance Sheets:
Cash and cash equivalents	712	1,088
Restricted cash and restricted cash equivalents	1,365	2,918
Total cash, cash equivalents, restricted cash and restricted cash equivalents at end of period	2,077	4,006
Asset-backed Securities, Securitized Loans and Receivables [Member]
Cash flows from financing activities
Asset-backed commercial paper conduits, net	$ (160)	$ (622)