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Borrowings - Company's Borrowings (Detail) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 31, 2018
Debt Instrument [Line Items]
Short-term borrowings	$ 6,785	$ 5,422
Long-term borrowings	86,776	93,519
Total	93,561	98,941
Total Before Hedge Accounting Adjustments [Member]
Debt Instrument [Line Items]
Short-term borrowings	6,762	5,425
Long-term borrowings	86,840	93,868
Total	93,602	99,293
Total Before Hedge Accounting Adjustments [Member] | Senior Unsecured Debt [Member]
Debt Instrument [Line Items]
Short-term borrowings	1,496	817
Long-term borrowings	9,005	10,674
Total	10,501	11,491
Total Before Hedge Accounting Adjustments [Member] | Total Unsecured Borrowings [Member]
Debt Instrument [Line Items]
Short-term borrowings	1,496	817
Long-term borrowings	9,005	10,674
Total	10,501	11,491
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan Securitizations [Member]
Debt Instrument [Line Items]
Short-term borrowings	72
Long-term borrowings	62,405	66,318
Total	62,477	66,318
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan Securitizations [Member]
Debt Instrument [Line Items]
Short-term borrowings	1,867	300
Long-term borrowings	12,541	12,985
Total	14,408	13,285
Total Before Hedge Accounting Adjustments [Member] | FFELP Loan - Other Facilities [Member]
Debt Instrument [Line Items]
Short-term borrowings	2,270	2,927
Long-term borrowings	1,836	2,625
Total	4,106	5,552
Total Before Hedge Accounting Adjustments [Member] | Private Education Loan - Other Facilities [Member]
Debt Instrument [Line Items]
Short-term borrowings	695	1,114
Long-term borrowings	1,053	1,266
Total	1,748	2,380
Total Before Hedge Accounting Adjustments [Member] | Other [Member]
Debt Instrument [Line Items]
Short-term borrowings	362	267
Total	362	267
Total Before Hedge Accounting Adjustments [Member] | Secured Borrowings [Member]
Debt Instrument [Line Items]
Short-term borrowings	5,266	4,608
Long-term borrowings	77,835	83,194
Total	83,101	87,802
Hedge Accounting Adjustments [Member]
Debt Instrument [Line Items]
Short-term borrowings	23	(3)
Long-term borrowings	(64)	(349)
Total	$ (41)	$ (352)

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