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Employee Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2019
Retirement Benefits [Abstract] |
Schedule of Defined Benefit Plans Disclosures [Table Text Block] | Contributions to our plans were as follows:
| Quarter Ended September 30, |  | Nine Months Ended September 30,
(dollars in millions) | 2019 |  | 2018 |  | 2019 |  | 2018
Defined benefit plans | $ | 10 |  |  | $ | 13 |  |  | $ | 89 |  |  | $ | 72 |
Defined contribution plans | 134 |  |  | 97 |  |  | 421 |  |  | 296 |
We made no contributions to our domestic defined benefit pension plans for quarter ended September 30, 2019 and $25 million of contributions in the nine months ended September 30, 2019. There were no contributions to our domestic defined benefit pension plans in the quarter and nine months ended September 30, 2018. Included in the current year contributions to employer sponsored defined contribution plans for the nine months ended September 30, 2019 is $98 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 September 30, |  | Other Postretirement Benefits Quarter Ended September 30,
(dollars in millions) | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | 88 |  |  | $ | 94 |  |  | $ | — |  |  | $ | — |
Interest cost | 334 |  |  | 274 |  |  | 7 |  |  | 7 |
Expected return on plan assets | (605 | ) |  | (558 | ) |  | — |  |  | — |
Amortization of prior service cost (credit) | 4 |  |  | (11 | ) |  | (10 | ) |  | — |
Recognized actuarial net loss (gain) | 66 |  |  | 100 |  |  | (3 | ) |  | (3 | )
Net settlement and curtailment (gain) loss | (96 | ) |  | 3 |  |  | — |  |  | — |
Total net periodic benefit (income) cost | $ | (209 | ) |  | $ | (98 | ) |  | $ | (6 | ) |  | $ | 4 |
| Pension Benefits Nine Months Ended September 30, |  | Other Postretirement Benefits Nine Months Ended September 30,
(dollars in millions) | 2019 |  | 2018 |  | 2019 |  | 2018
Service cost | $ | 264 |  |  | $ | 280 |  |  | $ | 2 |  |  | $ | 1 |
Interest cost | 1,014 |  |  | 831 |  |  | 23 |  |  | 19 |
Expected return on plan assets | (1,820 | ) |  | (1,683 | ) |  | (1 | ) |  | — |
Amortization of prior service cost (credit) | 13 |  |  | (31 | ) |  | (32 | ) |  | (2 | )
Recognized actuarial net loss (gain) | 172 |  |  | 302 |  |  | (9 | ) |  | (7 | )
Net settlement and curtailment (gain) | (87 | ) |  | — |  |  | — |  |  | — |
Total net periodic benefit (income) cost | $ | (444 | ) |  | $ | (301 | ) |  | $ | (17 | ) |  | $ | 11 |

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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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