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Allowance for Loan Losses - Age Analysis of Past Due Loans Delinquencies (Detail) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Loans in repayment and percentage of each status: |  |  |  |
Loan allowance for losses | $ (832) | $ (1,022) | $ (1,271) | $ (1,377)
Loans, net | 54,827 | 62,250 |  |
Private Education Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Total Loans, gross | 17,519 | 19,525 | 21,180 |
Loan allowance for losses | (617) | (800) | (1,009) | (1,089)
Loans, net | 16,902 | 18,725 |  |
FFELP Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Total Loans, gross | 38,140 | 43,747 | 52,903 |
Loan allowance for losses | (215) | (222) | $ (262) | $ (288)
Loans, net | 37,925 | 43,525 |  |
Credit Concentration Risk [Member] | Accounts Receivable [Member] | Private Education Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Total Loans, gross | 17,519 | 19,525 |  |
Loan allowance for losses | (617) | (800) |  |
Loans, net | 16,902 | 18,725 |  |
Credit Concentration Risk [Member] | Accounts Receivable [Member] | FFELP Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Total Loans, gross | 38,140 | 43,747 |  |
Loan allowance for losses | (215) | (222) |  |
Loans, net | $ 37,925 | $ 43,525 |  |
Dimensions of concentration risk | 100.00% | 100.00% |  |
Credit Concentration Risk [Member] | Financing Receivables, Current [Member] | Accounts Receivable [Member] | Private Education Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Dimensions of concentration risk | 94.90% | 95.00% |  |
Credit Concentration Risk [Member] | Financing Receivables, Current [Member] | Accounts Receivable [Member] | FFELP Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Dimensions of concentration risk | 86.10% | 84.40% |  |
Credit Concentration Risk [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] | Accounts Receivable [Member] | Private Education Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Loans delinquent, percentage | 1.80% | 1.80% |  |
Credit Concentration Risk [Member] | Financing Receivables, 31 to 60 Days Past Due [Member] | Accounts Receivable [Member] | FFELP Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Loans delinquent, percentage | 3.90% | 3.60% |  |
Credit Concentration Risk [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] | Accounts Receivable [Member] | Private Education Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Loans delinquent, percentage | 1.00% | 1.00% |  |
Credit Concentration Risk [Member] | Financing Receivables, 61 to 90 Days Past Due [Member] | Accounts Receivable [Member] | FFELP Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Loans delinquent, percentage | 2.50% | 2.40% |  |
Credit Concentration Risk [Member] | Financing Receivables, 90 Days Past Due [Member] | Accounts Receivable [Member] | Private Education Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Loans delinquent, percentage | 2.30% | 2.20% |  |
Credit Concentration Risk [Member] | Financing Receivables, 90 Days Past Due [Member] | Accounts Receivable [Member] | FFELP Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Loans delinquent, percentage | 7.50% | 9.60% |  |
Credit Concentration Risk [Member] | Financing Receivables, Loans In Repayment [Member] | Accounts Receivable [Member] | Private Education Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Dimensions of concentration risk | 95.90% | 96.10% |  |
Credit Concentration Risk [Member] | Financing Receivables, Loans In Repayment [Member] | Accounts Receivable [Member] | FFELP Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Dimensions of concentration risk | 79.80% | 78.60% |  |
Credit Concentration Risk [Member] | Financing Receivables, Delinquent Loans in Repayment [Member] | Accounts Receivable [Member] | Private Education Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Dimensions of concentration risk | 5.10% | 5.00% |  |
Credit Concentration Risk [Member] | Financing Receivables, Delinquent Loans in Repayment [Member] | Accounts Receivable [Member] | FFELP Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Dimensions of concentration risk | 13.90% | 15.60% |  |
Credit Concentration Risk [Member] | Financing Receivables, Forbearance, Loans In Repayment [Member] | Accounts Receivable [Member] | Private Education Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Dimensions of concentration risk | 2.10% | 2.10% |  |
Credit Concentration Risk [Member] | Financing Receivables, Forbearance, Loans In Repayment [Member] | Accounts Receivable [Member] | FFELP Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Dimensions of concentration risk | 16.80% | 18.10% |  |
School/Grace/Deferment [Member] | Credit Concentration Risk [Member] | Accounts Receivable [Member] | Private Education Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Total Loans, gross | $ 360 | $ 354 |  |
School/Grace/Deferment [Member] | Credit Concentration Risk [Member] | Accounts Receivable [Member] | FFELP Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Total Loans, gross | 1,557 | 1,772 |  |
Forbearance [Member] | Credit Concentration Risk [Member] | Accounts Receivable [Member] | Private Education Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Total Loans, gross | 363 | 401 |  |
Forbearance [Member] | Credit Concentration Risk [Member] | Accounts Receivable [Member] | FFELP Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Total Loans, gross | 6,147 | 7,603 |  |
Repayment [Member] | Credit Concentration Risk [Member] | Accounts Receivable [Member] | Private Education Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Total Loans, gross | $ 16,796 | $ 18,770 |  |
Dimensions of concentration risk | 100.00% | 100.00% |  |
Repayment [Member] | Credit Concentration Risk [Member] | Accounts Receivable [Member] | FFELP Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Total Loans, gross | $ 30,436 | $ 34,372 |  |
Repayment [Member] | Credit Concentration Risk [Member] | Financing Asset, Not Past Due [Member] | Accounts Receivable [Member] | Private Education Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Total Loans, gross | 15,935 | 17,838 |  |
Repayment [Member] | Credit Concentration Risk [Member] | Financing Asset, Not Past Due [Member] | Accounts Receivable [Member] | FFELP Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Total Loans, gross | 26,204 | 29,004 |  |
Repayment [Member] | Credit Concentration Risk [Member] | Financial Asset, 31 to 60 Days Past Due [Member] | Accounts Receivable [Member] | Private Education Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Total Loans, gross | 308 | 335 |  |
Repayment [Member] | Credit Concentration Risk [Member] | Financial Asset, 31 to 60 Days Past Due [Member] | Accounts Receivable [Member] | FFELP Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Total Loans, gross | 1,193 | 1,247 |  |
Repayment [Member] | Credit Concentration Risk [Member] | Financial Asset, 61 to 90 Days Past Due [Member] | Accounts Receivable [Member] | Private Education Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Total Loans, gross | 173 | 186 |  |
Repayment [Member] | Credit Concentration Risk [Member] | Financial Asset, 61 to 90 Days Past Due [Member] | Accounts Receivable [Member] | FFELP Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Total Loans, gross | 746 | 833 |  |
Repayment [Member] | Credit Concentration Risk [Member] | Financial Asset, 90 Days Past Due [Member] | Accounts Receivable [Member] | Private Education Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Total Loans, gross | 380 | 411 |  |
Repayment [Member] | Credit Concentration Risk [Member] | Financial Asset, 90 Days Past Due [Member] | Accounts Receivable [Member] | FFELP Loans [Member] |  |  |  |
Loans in repayment and percentage of each status: |  |  |  |
Total Loans, gross | $ 2,293 | $ 3,288 |  |

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