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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
 
Quarter Ended March 31, 2017
(dollars in millions)
Previously Reported
 
Effect of Change Higher/(Lower)
 
As Revised
Cost of product sold
$
7,263

 
$
48

 
$
7,311

Cost of services sold
2,814

 
11

 
2,825

Research and development
577

 
9

 
586

Selling, general and administrative
1,482

 
55

 
1,537

Other income
588

 
—

 
588

Non-service pension (benefit)
—

 
(123
)
 
(123
)
Contributions to our plans were as follows:
 
Quarter Ended March 31,
(dollars in millions)
2018
 
2017
Defined benefit plans
$
37

 
$
46

Defined contribution plans
94

 
90


There were no contributions to our domestic defined benefit pension plans in the quarters ended March 31, 2018 and 2017. 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)
2018
 
2017
 
2018
 
2017
Service cost
$
93

 
$
93

 
$
1

 
$
1

Interest cost
279

 
278

 
6

 
7

Expected return on plan assets
(563
)
 
(540
)
 
—

 
—

Amortization of prior service credit
(10
)
 
(9
)
 
(1
)
 
—

Recognized actuarial net loss (gain)
101

 
143

 
(2
)
 
(3
)
Net settlement and curtailment (gain) loss
(1
)
 
1

 
—

 
—

Total net periodic benefit (income) cost
$
(101
)
 
$
(34
)
 
$
4

 
$
5