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Employee Benefit Plans (Details) - USD ($) | 3 Months Ended
--- | ---
Mar. 31, 2019 | Mar. 31, 2018
Defined Benefit Plan Disclosure [Line Items] |  |
Pension Contributions | $ 32,000,000 | $ 37,000,000
Contributions - Defined benefit plans | 32,000,000 | 37,000,000
Contributions - Defined contribution plans | 153,000,000 | 94,000,000
Domestic Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Pension Contributions | 0 | 0
Pension Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 87,000,000 | 93,000,000
Interest cost | 340,000,000 | 279,000,000
Expected return on plan assets | 607,000,000 | 563,000,000
Amortization of prior service cost (credit) | 5,000,000 | (10,000,000)
Recognized actuarial net loss (gain) | (53,000,000) | (101,000,000)
Net settlement and curtailment (loss) gain | (8,000,000) | 1,000,000
Total net periodic benefit (income) cost | (114,000,000) | (101,000,000)
Other Postretirement Benefits Plan [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Service cost | 1,000,000 | 1,000,000
Interest cost | 8,000,000 | 6,000,000
Expected return on plan assets | 1,000,000 | 0
Amortization of prior service cost (credit) | (11,000,000) | (1,000,000)
Recognized actuarial net loss (gain) | 3,000,000 | 2,000,000
Net settlement and curtailment (loss) gain | 0 | 0
Total net periodic benefit (income) cost | (6,000,000) | $ 4,000,000
Rockwell Collins Defined Contribution Plans [Member] |  |
Defined Benefit Plan Disclosure [Line Items] |  |
Contributions - Defined contribution plans | $ 35,000,000 |

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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