Table:
|  |  |  | As of and for the Years Ended December 31, |  |  |
| --- | --- | --- | --- | --- | --- |
|  | 2018 | Recognition of Net Periodic Benefits Expense | Deferrals | Net Change in AOCL | 2019 |
|  |  |  | (Dollars in millions) |  |  |
| Accumulated other comprehensive loss: |  |  |  |  |  |
| Pension plans: |  |  |  |  |  |
| Net actuarial (loss) gain | $(2,973) | 224 | (297) | (73) | (3,046) |
| Prior service benefit (cost) | 46 | (8) | 9 | 1 | 47 |
| Deferred income tax benefit (expense) | 754 | (53) | 69 | 16 | 770 |
| Total pension plans | (2,173) | 163 | (219) | (56) | (2,229) |
| Post-retirement benefit plans: |  |  |  |  |  |
| Net actuarial (loss) gain | 7 | — | (182) | (182) | (175) |
| Prior service (cost) benefit | (87) | 16 | — | 16 | (71) |
| Deferred income tax benefit (expense) | 22 | (4) | 44 | 40 | 62 |
| Total post-retirement benefit plans | (58) | 12 | (138) | (126) | (184) |
| Total accumulated other comprehensive loss | $(2,231) | 175 | (357) | (182) | (2,413) |
Paragraphs:
Accumulated Other Comprehensive Loss-Recognition and Deferrals
The following table presents cumulative items not recognized as a component of net periodic benefits expense as of December 31, 2018, items recognized as a component of net periodic benefits expense in 2019, additional items deferred during 2019 and cumulative items not recognized as a component of net periodic benefits expense as of December 31, 2019. The items not recognized as a component of net periodic benefits expense have been recorded on our consolidated balance sheets in accumulated other comprehensive loss:
Question:
Which year has a larger prior service benefit (cost) under pension plans?
Answer: Because 46<47, the answer is: 2019.