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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2019
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
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