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Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2019
Defined Benefit Plan [Abstract] |
EMPLOYEE BENEFIT PLANS | 9. EMPLOYEE BENEFIT PLANS The components of net periodic benefit cost related to our defined benefit plans were as follows (in millions):
| Pension Plans |  | Other Postretirement Benefit Plans
| 2019 |  | 2018 |  | 2019 |  | 2018
Three months ended September 30: |  |  |  |  |  |  |
Service cost | $ | 29 |  |  | $ | 33 |  |  | $ | 1 |  |  | $ | 2 |
Interest cost | 25 |  |  | 22 |  |  | 2 |  |  | 2 |
Expected return on plan assets | (41 | ) |  | (40 | ) |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |
Net actuarial (gain) loss | 10 |  |  | 16 |  |  | — |  |  | (1 | )
Prior service credit | (5 | ) |  | (5 | ) |  | (2 | ) |  | (2 | )
Special charges | — |  |  | 2 |  |  | — |  |  | — |
Net periodic benefit cost | $ | 18 |  |  | $ | 28 |  |  | $ | 1 |  |  | $ | 1 |
Nine months ended September 30: |  |  |  |  |  |  |
Service cost | $ | 89 |  |  | $ | 100 |  |  | $ | 3 |  |  | $ | 5 |
Interest cost | 74 |  |  | 68 |  |  | 8 |  |  | 7 |
Expected return on plan assets | (124 | ) |  | (122 | ) |  | — |  |  | — |
Amortization of: |  |  |  |  |  |  |
Net actuarial (gain) loss | 30 |  |  | 49 |  |  | (2 | ) |  | (2 | )
Prior service credit | (14 | ) |  | (14 | ) |  | (6 | ) |  | (8 | )
Special charges | 2 |  |  | 7 |  |  | 1 |  |  | — |
Net periodic benefit cost | $ | 57 |  |  | $ | 88 |  |  | $ | 4 |  |  | $ | 2 |
The components of net periodic benefit cost other than the service cost component (i.e., the non-service cost components) are included in “other income, net” in the statements of income. During the nine months ended September 30, 2019 and 2018, we contributed $120 million and $132 million, respectively, to our pension plans and $13 million and $15 million, respectively, to our other postretirement benefit plans. Of the $120 million contributed to our pension plans during the nine months ended September 30, 2019, $85 million was discretionary and was contributed during the third quarter of 2019. Our expected contribution to our pension plans has increased to approximately $125 million for 2019 primarily as a result of the discretionary pension contribution discussed above. Our expected contribution of approximately $21 million to our other postretirement benefit plans during 2019 has not changed.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -URI http://asc.fasb.org/topic&trid=2235017 + Details
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