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Fair Value Measurements - Fair Values of Financial Assets and Liabilities, Including Derivative Financial Instruments (Detail) - USD ($) $ in Millions | Jun. 30, 2021 | Dec. 31, 2020 | Jun. 30, 2020
--- | --- | --- | ---
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total earning assets, Carrying Value | $ 79,350 | $ 83,185 |
Short-term borrowings, Carrying Value | 4,068 | 6,613 |
Long-term borrowings, Carrying Value | 75,814 | 77,332 |
Total | 79,882 | 83,945 |
Total earning assets, Fair Value | 81,935 | 85,401 |
Short-term borrowings, Fair Value | 4,111 | 6,626 |
Long-term borrowings, Fair Value | 76,156 | 76,719 |
Total interest-bearing liabilities, Fair Value | 80,267 | 83,345 |
FFELP Loans [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Loans, Carrying Value | 55,550 | 58,284 |
Loans receivable, Fair Value | 57,002 | 59,117 |
Floor Income Contracts [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative financial instruments, Carrying Value | (139) | (197) |
Derivative financial instruments, Fair Value | (139) | (197) |
Interest Rate Swaps [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative financial instruments, Carrying Value | 254 | 315 |
Derivative financial instruments, Fair Value | 254 | 315 |
Cross-Currency Interest Rate Swaps [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Derivative financial instruments, Carrying Value | (108) | (294) |
Derivative financial instruments, Fair Value | (108) | (294) |
Private Education Loans [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Loans, Carrying Value | 19,725 | 21,079 | $ 21,462
Loans receivable, Fair Value | 20,858 | 22,462 |
Difference [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Total earning assets, Fair Value | 2,585 | 2,216 |
Short-term borrowings, Fair Value | (43) | (13) |
Long-term borrowings, Fair Value | (342) | 613 |
Total interest-bearing liabilities, Fair Value | (385) | 600 |
Excess of net asset fair value over carrying value | 2,200 | 2,816 |
Difference [Member] | FFELP Loans [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Loans receivable, Fair Value | 1,452 | 833 |
Difference [Member] | Private Education Loans [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Loans receivable, Fair Value | 1,133 | 1,383 |
Carrying Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash and investments | 4,075 | 3,822 |
Fair Value [Member] |  |  |
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items] |  |  |
Cash and investments | $ 4,075 | $ 3,822 |

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- Definition Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=120520924&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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