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Allowance for Loan Losses - Allowance for Credit Losses and Recorded Investments in Loans (Detail) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 USD ($) SecurityLoan | Jun. 30, 2018 USD ($) SecurityLoan | Jun. 30, 2019 USD ($) SecurityLoan | Jun. 30, 2018 USD ($) SecurityLoan
Allowance for Loan Losses |  |  |  |
Beginning balance | $ 1,252 | $ 1,367 | $ 1,286 | $ 1,367
Total provision | 68 | 112 | 144 | 199
Charge-offs | (95) | (92) | (207) | (181)
Reclassification of interest reserve | 1 | 2 | 4 | 4
Loan sales | (8) |  | (9) |
Ending balance | 1,218 | 1,389 | 1,218 | 1,389
Allowance Ending Balance: |  |  |  |
Ending balance: individually evaluated for impairment - TDR | 1,040 | 1,151 | 1,040 | 1,151
Collectively evaluated for impairment: |  |  |  |
Excluding Purchased Non-Credit Impaired Loans acquired at a discount and Purchased Credit Impaired Loans | 178 | 238 | 178 | 238
Ending balance | 1,218 | 1,389 | 1,218 | 1,389
Loans Ending Balance: |  |  |  |
Ending balance: individually evaluated for impairment - TDR | 10,000 | 10,707 | 10,000 | 10,707
Collectively evaluated for impairment: |  |  |  |
Excluding Purchased Non-Credit Impaired Loans acquired at a discount and Purchased Credit Impaired Loans | 76,002 | 84,480 | 76,002 | 84,480
Purchased Non-Credit Impaired Loans acquired at a discount | 4,648 | 5,420 | 4,648 | 5,420
Purchased Credit Impaired Loans | 214 | 236 | 214 | 236
Ending total loans | 90,864 | 100,843 | 90,864 | 100,843
FFELP Loans [Member] |  |  |  |
Allowance for Loan Losses |  |  |  |
Beginning balance | 67 | 59 | 76 | 60
Total provision | 8 | 40 | 15 | 50
Charge-offs | (7) | (17) | (24) | (28)
Ending balance | 67 | 82 | 67 | 82
Collectively evaluated for impairment: |  |  |  |
Excluding Purchased Non-Credit Impaired Loans acquired at a discount and Purchased Credit Impaired Loans | 67 | 82 | 67 | 82
Ending balance | 67 | 82 | 67 | 82
Collectively evaluated for impairment: |  |  |  |
Excluding Purchased Non-Credit Impaired Loans acquired at a discount and Purchased Credit Impaired Loans | 64,783 | 73,018 | 64,783 | 73,018
Purchased Non-Credit Impaired Loans acquired at a discount | 2,671 | 3,034 | 2,671 | 3,034
Ending total loans | $ 67,454 | $ 76,052 | $ 67,454 | $ 76,052
Charge-offs as a percentage of average loans in repayment | 0.05% | 0.11% | 0.08% | 0.09%
Allowance coverage of charge-offs | SecurityLoan | 2.2 | 1.2 | 1.4 | 1.5
Allowance as a percentage of the ending total loan balance | 0.10% | 0.11% | 0.10% | 0.11%
Allowance as a percentage of the ending loans in repayment | 0.12% | 0.13% | 0.12% | 0.13%
Average loans in repayment | $ 56,657 | $ 64,238 | $ 57,435 | $ 64,940
Ending loans in repayment | 55,684 | 62,952 | 55,684 | 62,952
Private Education Loans [Member] |  |  |  |
Allowance for Loan Losses |  |  |  |
Beginning balance | 1,178 | 1,298 | 1,201 | 1,297
Total provision | 60 | 72 | 128 | 149
Charge-offs | (87) | (75) | (181) | (153)
Reclassification of interest reserve | 1 | 2 | 4 | 4
Loan sales | (1) |  | (1) |
Ending balance | 1,151 | 1,297 | 1,151 | 1,297
Allowance Ending Balance: |  |  |  |
Ending balance: individually evaluated for impairment - TDR | 1,040 | 1,142 | 1,040 | 1,142
Collectively evaluated for impairment: |  |  |  |
Excluding Purchased Non-Credit Impaired Loans acquired at a discount and Purchased Credit Impaired Loans | 111 | 155 | 111 | 155
Ending balance | 1,151 | 1,297 | 1,151 | 1,297
Loans Ending Balance: |  |  |  |
Ending balance: individually evaluated for impairment - TDR | 10,000 | 10,679 | 10,000 | 10,679
Collectively evaluated for impairment: |  |  |  |
Excluding Purchased Non-Credit Impaired Loans acquired at a discount and Purchased Credit Impaired Loans | 11,215 | 11,411 | 11,215 | 11,411
Purchased Non-Credit Impaired Loans acquired at a discount | 1,977 | 2,386 | 1,977 | 2,386
Purchased Credit Impaired Loans | 214 | 236 | 214 | 236
Ending total loans | $ 23,406 | $ 24,712 | $ 23,406 | $ 24,712
Charge-offs as a percentage of average loans in repayment | 1.59% | 1.34% | 1.66% | 1.37%
Allowance coverage of charge-offs | SecurityLoan | 3.3 | 4.3 | 3.2 | 4.2
Allowance as a percentage of the ending total loan balance | 4.92% | 5.25% | 4.92% | 5.25%
Allowance as a percentage of the ending loans in repayment | 5.37% | 5.85% | 5.37% | 5.85%
Average loans in repayment | $ 21,854 | $ 22,289 | $ 21,957 | $ 22,474
Ending loans in repayment | 21,439 | 22,174 | 21,439 | 22,174
Other Loans [Member] |  |  |  |
Allowance for Loan Losses |  |  |  |
Beginning balance | 7 | 10 | 9 | 10
Total provision |  |  | 1 |
Charge-offs | (1) |  | (2) |
Loan sales | (7) |  | (8) |
Ending balance |  | 10 |  | 10
Allowance Ending Balance: |  |  |  |
Ending balance: individually evaluated for impairment - TDR |  | 9 |  | 9
Collectively evaluated for impairment: |  |  |  |
Excluding Purchased Non-Credit Impaired Loans acquired at a discount and Purchased Credit Impaired Loans |  | 1 |  | 1
Ending balance |  | 10 |  | 10
Loans Ending Balance: |  |  |  |
Ending balance: individually evaluated for impairment - TDR |  | 28 |  | 28
Collectively evaluated for impairment: |  |  |  |
Excluding Purchased Non-Credit Impaired Loans acquired at a discount and Purchased Credit Impaired Loans | 4 | 51 | 4 | 51
Ending total loans | $ 4 | $ 79 | $ 4 | $ 79
Charge-offs as a percentage of average loans in repayment | 10.19% | 2.63% | 7.78% | 1.13%
Allowance coverage of charge-offs | SecurityLoan |  | 5.1 |  | 11.9
Allowance as a percentage of the ending total loan balance |  | 12.54% |  | 12.21%
Allowance as a percentage of the ending loans in repayment |  | 12.54% |  | 12.21%
Average loans in repayment | $ 28 | $ 73 | $ 52 | $ 72
Ending loans in repayment | $ 4 | $ 79 | $ 4 | $ 79

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