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Borrowings - Company's Borrowings (Detail) - USD ($) $ in Millions	Sep. 30, 2022	Dec. 31, 2021
Debt Instrument [Line Items]
Short-term borrowings	$ 5,677	$ 2,490
Long-term borrowings	63,998	74,488
Total	69,675	76,978
Total Before Hedge Accounting Adjustments [Member]
Debt Instrument [Line Items]
Short-term borrowings	5,692	2,490
Long-term borrowings	64,658	74,231
Total	70,350	76,721
Total Before Hedge Accounting Adjustments [Member] | Senior Unsecured Debt [Member]
Debt Instrument [Line Items]
Short-term borrowings	1,299
Long-term borrowings	5,709	7,014
Total	7,008	7,014
Total Before Hedge Accounting Adjustments [Member] | Total Unsecured Borrowings [Member]
Debt Instrument [Line Items]
Short-term borrowings	1,299
Long-term borrowings	5,709	7,014
Total	7,008	7,014
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan Securitizations [Member]
Debt Instrument [Line Items]
Short-term borrowings	83
Long-term borrowings	45,358	51,841
Total	45,441	51,841
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan Securitizations [Member]
Debt Instrument [Line Items]
Short-term borrowings	813	543
Long-term borrowings	13,300	14,074
Total	14,113	14,617
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan ABCP Facilities [Member]
Debt Instrument [Line Items]
Short-term borrowings	974	282
Long-term borrowings	291	150
Total	1,265	432
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan ABCP Facilities [Member]
Debt Instrument [Line Items]
Short-term borrowings	2,418	1,363
Long-term borrowings		1,152
Total	2,418	2,515
Total Before Hedge Accounting Adjustments [Member] | Other [Member]
Debt Instrument [Line Items]
Short-term borrowings	105	302
Total	105	302
Total Before Hedge Accounting Adjustments [Member] | Secured Borrowings [Member]
Debt Instrument [Line Items]
Short-term borrowings	4,393	2,490
Long-term borrowings	58,949	67,217
Total	63,342	69,707
Hedge Accounting Adjustments [Member]
Debt Instrument [Line Items]
Short-term borrowings	(15)
Long-term borrowings	(660)	257
Total	$ (675)	$ 257

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