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EMPLOYEE BENEFIT PLANS | 9 Months Ended
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Sep. 30, 2019
Retirement Benefits [Abstract] |
EMPLOYEE BENEFIT PLANS | EMPLOYEE BENEFIT PLANS Net periodic benefit costs for qualified defined-benefit plans include the following (in millions):
| Three Months Ended September 30, |  | Nine Months Ended September 30,
| 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | 11 |  |  | $ | 12 |  |  | $ | 32 |  |  | $ | 36 |
Pension expense included in Wages and benefits | 11 |  |  | 12 |  |  | 32 |  |  | 36 |
Interest cost | 23 |  |  | 20 |  |  | 67 |  |  | 59 |
Expected return on assets | (24 | ) |  | (27 | ) |  | (71 | ) |  | (80 | )
Amortization of prior service cost (credit) | (1 | ) |  | (1 | ) |  | (1 | ) |  | (1 | )
Recognized actuarial loss | 9 |  |  | 9 |  |  | 27 |  |  | 25 |
Pension expense included in Nonoperating Income (Expense) | $ | 7 |  |  | $ | 1 |  |  | $ | 22 |  |  | $ | 3 |
The Company made a voluntary contribution of $65 million to three defined-benefit pension plans during the three months ended September 30, 2019.

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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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