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Employee Benefit Plans (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension Contributions |  |  | $ 79 | $ 59
Contributions - Defined benefit plans | $ 47 | $ 22 | 79 | 59
Contributions - Defined contribution plans | 134 | 105 | 287 | 199
Domestic Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Pension Contributions | 25 | 0 | 25 | 0
Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 89 | 93 | 176 | 186
Interest cost | 340 | 278 | 680 | 557
Expected return on plan assets | 608 | 562 | 1,215 | 1,125
Amortization of prior service cost (credit) | 4 | (10) | 9 | (20)
Recognized actuarial net loss (gain) | (53) | (101) | (106) | (202)
Net settlement and curtailment (loss) gain | (1) | 2 | (9) | 3
Total net periodic benefit (income) cost | (121) | (102) | (235) | (203)
Other Postretirement Benefits Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 1 | 0 | 2 | 1
Interest cost | 8 | 6 | 16 | 12
Expected return on plan assets | 0 | 0 | 1 | 0
Amortization of prior service cost (credit) | (11) | (1) | (22) | (2)
Recognized actuarial net loss (gain) | 3 | 2 | 6 | 4
Net settlement and curtailment (loss) gain | 0 | 0 | 0 | 0
Total net periodic benefit (income) cost | $ (5) | $ 3 | (11) | $ 7
Rockwell Collins Defined Contribution Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Contributions - Defined contribution plans |  |  | $ 65 |

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