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Borrowings - Company's Borrowings (Detail) - USD ($) $ in Millions	Jun. 30, 2021	Dec. 31, 2020
Debt Instrument [Line Items]
Short-term borrowings	$ 4,068	$ 6,613
Long-term borrowings	75,814	77,332
Total	79,882	83,945
Total Before Hedge Accounting Adjustments [Member]
Debt Instrument [Line Items]
Short-term borrowings	4,038	6,609
Long-term borrowings	75,340	76,781
Total	79,378	83,390
Total Before Hedge Accounting Adjustments [Member] | Senior Unsecured Debt [Member]
Debt Instrument [Line Items]
Short-term borrowings	1,658	677
Long-term borrowings	6,465	7,714
Total	8,123	8,391
Total Before Hedge Accounting Adjustments [Member] | Total Unsecured Borrowings [Member]
Debt Instrument [Line Items]
Short-term borrowings	1,658	677
Long-term borrowings	6,465	7,714
Total	8,123	8,391
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan Securitizations [Member]
Debt Instrument [Line Items]
Long-term borrowings	54,000	54,697
Total	54,000	54,697
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan Securitizations [Member]
Debt Instrument [Line Items]
Short-term borrowings	832	960
Long-term borrowings	13,154	13,891
Total	13,986	14,851
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan ABCP Facilities [Member]
Debt Instrument [Line Items]
Short-term borrowings		2,053
Long-term borrowings	462	479
Total	462	2,532
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan ABCP Facilities [Member]
Debt Instrument [Line Items]
Short-term borrowings	1,194	2,582
Long-term borrowings	1,259
Total	2,453	2,582
Total Before Hedge Accounting Adjustments [Member] | Other [Member]
Debt Instrument [Line Items]
Short-term borrowings	354	337
Total	354	337
Total Before Hedge Accounting Adjustments [Member] | Secured Borrowings [Member]
Debt Instrument [Line Items]
Short-term borrowings	2,380	5,932
Long-term borrowings	68,875	69,067
Total	71,255	74,999
Hedge Accounting Adjustments [Member]
Debt Instrument [Line Items]
Short-term borrowings	30	4
Long-term borrowings	474	551
Total	$ 504	$ 555

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