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Segment Reporting - Asset Information for Loans Segment (Detail) - USD ($) $ in Millions	Jun. 30, 2025	Dec. 31, 2024
Segment Reporting Information [Line Items]
Other	$ 2,426	$ 2,538
Total assets	50,222	51,789
Federal Education Loans [Member]
Segment Reporting Information [Line Items]
Loans, net	29,618	30,852
Cash and investments	938	955
Other	1,832	1,818
Total assets	32,388	33,625
Consumer Lending [Member]
Segment Reporting Information [Line Items]
Loans, net	15,530	15,716
Cash and investments	532	524
Other	540	569
Total assets	$ 16,602	$ 16,809

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