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Employee Benefit Plans | 3 Months Ended
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Mar. 31, 2019
Retirement Benefits [Abstract] |
Pension and Other Postretirement Benefits Disclosure [Text Block] | Employee Benefit Plans Pension and Postretirement Plans. We sponsor both funded and unfunded domestic and foreign defined pension and other postretirement benefit plans, and defined contribution plans. Contributions to our plans were as follows:
| Quarter Ended March 31,
(dollars in millions) | 2019 |  | 2018
Defined benefit plans | $ | 32 |  |  | $ | 37 |
Defined contribution plans | 153 |  |  | 94 |
There were no contributions to our domestic defined benefit pension plans in the quarters ended March 31, 2019 and 2018. Included in the current year contributions to employer sponsored defined contribution plans is $35 million of contributions to the Rockwell Collins defined contribution plans. The following table illustrates the components of net periodic benefit cost for our defined pension and other postretirement benefit plans:
| Pension Benefits Quarter Ended March 31, |  | Other Postretirement Benefits Quarter Ended March 31,
(dollars in millions) | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | 87 |  |  | $ | 93 |  |  | $ | 1 |  |  | $ | 1 |
Interest cost | 340 |  |  | 279 |  |  | 8 |  |  | 6 |
Expected return on plan assets | (607 | ) |  | (563 | ) |  | (1 | ) |  | — |
Amortization of prior service cost (credit) | 5 |  |  | (10 | ) |  | (11 | ) |  | (1 | )
Recognized actuarial net loss (gain) | 53 |  |  | 101 |  |  | (3 | ) |  | (2 | )
Net settlement and curtailment loss (gain) | 8 |  |  | (1 | ) |  | — |  |  | — |
Total net periodic benefit (income) cost | $ | (114 | ) |  | $ | (101 | ) |  | $ | (6 | ) |  | $ | 4 |

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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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