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Segment Reporting - Asset Information for Loans Segment (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Segment Reporting Information [Line Items]
Other	$ 3,272	$ 3,492
Total assets	83,348	87,412
Federal Education Loans [Member]
Segment Reporting Information [Line Items]
Loans, net	55,550	58,284
Cash and investments	1,694	1,685
Other	2,138	2,241
Total assets	59,382	62,210
Consumer Lending [Member]
Segment Reporting Information [Line Items]
Loans, net	19,725	21,079
Cash and investments	878	828
Other	883	964
Total assets	$ 21,486	$ 22,871

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