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Segment Reporting - Asset Information for Loans Segment (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Segment Reporting Information [Line Items]
Other	$ 2,787	$ 3,223
Total assets	73,625	80,605
Federal Education Loans [Member]
Segment Reporting Information [Line Items]
Loans, net	46,891	52,641
Cash and investments	2,059	2,071
Other	2,039	2,183
Total assets	50,989	56,895
Consumer Lending [Member]
Segment Reporting Information [Line Items]
Loans, net	19,151	20,171
Cash and investments	583	824
Other	549	815
Total assets	$ 20,283	$ 21,810

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Sum of cash and investments, including restricted cash and investments, as of the balance sheet date.

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