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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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