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EMPLOYEE BENEFIT PLANS | 6 Months Ended
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Jun. 30, 2022
Retirement Benefits [Abstract] |
EMPLOYEE BENEFIT PLANS | EMPLOYEE BENEFIT PLANSNet periodic benefit costs for qualified defined-benefit plans include the following (in millions):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2022 |  | 2021 |  | 2022 |  | 2021
Service cost | $ | 11 |  |  | $ | 13 |  |  | $ | 22 |  |  | $ | 26 |
Pension expense included in Wages and benefits | 11 |  |  | 13 |  |  | 22 |  |  | 26 |
Interest cost | 16 |  |  | 14 |  |  | 32 |  |  | 28 |
Expected return on assets | (32) |  |  | (30) |  |  | (64) |  |  | (61) |
Recognized actuarial loss | 2 |  |  | 9 |  |  | 4 |  |  | 18 |
Pension expense included in Nonoperating Income (Expense) | $ | (14) |  |  | $ | (7) |  |  | $ | (28) |  |  | $ | (15) |

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