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Employee Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2019
Retirement Benefits [Abstract] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | Contributions to our plans were as follows:
| Quarter Ended June 30, |  | Six Months Ended June 30,
(dollars in millions) | 2019 |  | 2018 |  | 2019 |  | 2018
Defined benefit plans | $ | 47 |  |  | $ | 22 |  |  | $ | 79 |  |  | $ | 59 |
Defined contribution plans | 134 |  |  | 105 |  |  | 287 |  |  | 199 |
We made contributions of $25 million to our domestic defined benefit pension plans in the quarter and six months ended June 30, 2019. There were no contributions to our domestic defined benefit pension plans in the quarter and six months ended June 30, 2018. Included in the current year contributions to employer sponsored defined contribution plans for the six months ended June 30, 2019 is $65 million of contributions to the Rockwell Collins participants. The following table illustrates the components of net periodic benefit (income) cost for our defined pension and other postretirement benefit plans:
| Pension Benefits Quarter Ended June 30, |  | Other Postretirement Benefits Quarter Ended June 30,
(dollars in millions) | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | 89 |  |  | $ | 93 |  |  | $ | 1 |  |  | $ | — |
Interest cost | 340 |  |  | 278 |  |  | 8 |  |  | 6 |
Expected return on plan assets | (608 | ) |  | (562 | ) |  | — |  |  | — |
Amortization of prior service cost (credit) | 4 |  |  | (10 | ) |  | (11 | ) |  | (1 | )
Recognized actuarial net loss (gain) | 53 |  |  | 101 |  |  | (3 | ) |  | (2 | )
Net settlement and curtailment loss (gain) | 1 |  |  | (2 | ) |  | — |  |  | — |
Total net periodic benefit (income) cost | $ | (121 | ) |  | $ | (102 | ) |  | $ | (5 | ) |  | $ | 3 |
| Pension Benefits Six Months Ended June 30, |  | Other Postretirement Benefits Six Months Ended June 30,
(dollars in millions) | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | 176 |  |  | $ | 186 |  |  | $ | 2 |  |  | $ | 1 |
Interest cost | 680 |  |  | 557 |  |  | 16 |  |  | 12 |
Expected return on plan assets | (1,215 | ) |  | (1,125 | ) |  | (1 | ) |  | — |
Amortization of prior service cost (credit) | 9 |  |  | (20 | ) |  | (22 | ) |  | (2 | )
Recognized actuarial net loss (gain) | 106 |  |  | 202 |  |  | (6 | ) |  | (4 | )
Net settlement and curtailment loss (gain) | 9 |  |  | (3 | ) |  | — |  |  | — |
Total net periodic benefit (income) cost | $ | (235 | ) |  | $ | (203 | ) |  | $ | (11 | ) |  | $ | 7 |

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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&loc=d3e4179-114921 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2439-114920 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2410-114920 Reference 5: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2417-114920 + Details
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