Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jun. 30, 2023	Jun. 30, 2024	Jun. 30, 2023
Interest income:
Cash and investments	$ 48	$ 36	$ 86	$ 70
Total interest income	973	1,097	2,000	2,169
Total interest expense	843	919	1,718	1,756
Net interest income	130	178	282	413
Less: provisions for loan losses	14	11	26	(3)
Net interest income (loss) after provisions for loan losses	116	167	256	416
Other income (loss):
Servicing revenue	18	16	35	33
Asset recovery and business processing revenue	81	83	158	155
Other income	4	4	13	11
Gains (losses) on derivative and hedging activities, net	14	26	46	17
Total other income	117	129	252	216
Expenses:
Salaries and benefits	87	98	188	203
Other operating expenses	79	84	162	165
Total operating expenses	166	182	350	368
Goodwill and acquired intangible asset impairment and amortization expense	3	3	5	5
Restructuring/other reorganization expenses	16	15	17	19
Total expenses	185	200	372	392
Income before income tax expense	48	96	136	240
Income tax expense	12	30	27	63
Net income	$ 36	$ 66	$ 109	$ 177
Basic earnings per common share	$ 0.32	$ 0.53	$ 0.98	$ 1.4
Average common shares outstanding	111	124	112	126
Diluted earnings per common share	$ 0.32	$ 0.52	$ 0.97	$ 1.39
Average common and common equivalent shares outstanding	112	125	113	128
Dividends per common share	$ 0.16	$ 0.16	$ 0.32	$ 0.32
FFELP Loans [Member]
Interest income:
Total interest income	$ 608	$ 720	$ 1,269	$ 1,413
Less: provisions for loan losses	(2)	5	(1)	15
Private Education Loans [Member]
Interest income:
Total interest income	317	341	645	686
Less: provisions for loan losses	$ 16	$ 6	$ 27	$ (18)