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Borrowings - Company's Borrowings (Parenthetical) (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Short-term debt	$ 5,677	$ 2,490
Long-term debt	63,998	74,488
FFELP Loan Asset-backed Securitization Repurchase Facilities [Member]
Debt Instrument [Line Items]
Debt tranches default amount	778
Total Before Hedge Accounting Adjustments [Member]
Debt Instrument [Line Items]
Short-term debt	5,692	2,490
Long-term debt	64,658	74,231
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan Asset-backed Securitization Repurchase Facilities [Member]
Debt Instrument [Line Items]
Short-term debt	83	0
Long-term debt	0	49
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan Asset-backed Securitization Repurchase Facilities [Member]
Debt Instrument [Line Items]
Short-term debt	813	543
Total Before Hedge Accounting Adjustments [Member] | Short Term Senior Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt principal amount	1,300	0
Total Before Hedge Accounting Adjustments [Member] | Long Term Senior Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt principal amount	$ 5,700	$ 7,000

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