Consolidated Statements of Income (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Interest income:
Cash and investments	$ 25	$ 24	$ 52	$ 41
Total interest income	1,204	1,227	2,439	2,399
Total interest expense	911	929	1,860	1,773
Net interest income	293	298	579	626
Less: provisions for loan losses	68	112	144	199
Net interest income after provisions for loan losses	225	186	435	427
Other income (loss):
Servicing revenue	60	71	122	140
Asset recovery and business processing revenue	123	99	242	207
Other income (loss)	11	13	27	1
Gains on sales of loans	16		16
Gains (losses) on debt repurchases	44	(7)	59	(8)
Gains (losses) on derivative and hedging activities, net	(32)	(40)	(25)	8
Total other income	222	136	441	348
Expenses:
Salaries and benefits	125	125	253	259
Other operating expenses	116	76	244	217
Total operating expenses	241	201	497	476
Goodwill and acquired intangible asset impairment and amortization expense	11	6	18	16
Restructuring/other reorganization expenses	1	2	2	9
Total expenses	253	209	517	501
Income before income tax expense	194	113	359	274
Income tax expense	41	30	78	64
Net income (loss)	$ 153	$ 83	$ 281	$ 210
Basic earnings per common share	$ 0.65	$ 0.31	$ 1.17	$ 0.79
Average common shares outstanding	235	265	239	264
Diluted earnings per common share	$ 0.64	$ 0.31	$ 1.16	$ 0.78
Average common and common equivalent shares outstanding	238	269	242	269
Dividends per common share	$ 0.16	$ 0.16	$ 0.32	$ 0.32
FFELP Loans [Member]
Interest income:
Total interest income	$ 742	$ 760	$ 1,506	$ 1,483
Less: provisions for loan losses	8	40	15	50
Private Education Loans [Member]
Interest income:
Total interest income	436	442	879	873
Less: provisions for loan losses	60	72	128	149
Other Loans [Member]
Interest income:
Total interest income	$ 1	$ 1	$ 2	$ 2