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Borrowings - Company's Borrowings (Parenthetical) (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Long-term debt	$ 75,814	$ 77,332
Short-term Debt	4,068	6,613
Total Before Hedge Accounting Adjustments [Member]
Debt Instrument [Line Items]
Long-term debt	75,340	76,781
Short-term Debt	4,038	6,609
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan Asset-backed Securitization Repurchase Facilities [Member]
Debt Instrument [Line Items]
Long-term debt	155	157
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan Asset-backed Securitization Repurchase Facilities [Member]
Debt Instrument [Line Items]
Long-term debt	0	260
Short-term Debt	832	960
Total Before Hedge Accounting Adjustments [Member] | Short Term Senior Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt principal amount	1,700	678
Total Before Hedge Accounting Adjustments [Member] | Long Term Senior Unsecured Debt [Member]
Debt Instrument [Line Items]
Debt principal amount	$ 6,500	$ 7,800

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