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Employee Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Retirement Benefits [Abstract]  
Schedule of Defined Benefit Plans Disclosures [Table Text Block]
 
Quarter Ended June 30, 2017
(dollars in millions)
Previously Reported
 
Effect of Change Higher/(Lower)
 
As Revised
Cost of product sold
$
7,907

 
$
50

 
$
7,957

Cost of services sold
3,193

 
14

 
3,207

Research and development
609

 
10

 
619

Selling, general and administrative
1,538

 
52

 
1,590

Non-service pension (benefit)
—

 
(126
)
 
(126
)
 
Six Months Ended June 30, 2017
(dollars in millions)
Previously Reported
 
Effect of Change Higher/(Lower)
 
As Revised
Cost of product sold
15,170

 
98

 
15,268

Cost of services sold
6,007

 
25

 
6,032

Research and development
1,186

 
19

 
1,205

Selling, general and administrative
3,020

 
107

 
3,127

Non-service pension (benefit)
—

 
(249
)
 
(249
)
Contributions to our plans were as follows:
 
Quarter Ended June 30,
 
Six Months Ended June 30,
(dollars in millions)
2018
 
2017
 
2018
 
2017
Defined benefit plans
$
22

 
$
33

 
$
59

 
$
79

Defined contribution plans
105

 
86

 
199

 
176


There were no contributions to our domestic defined benefit pension plans in the quarter and six months ended June 30, 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 June 30,
 
Other Postretirement Benefits
Quarter Ended June 30,
(dollars in millions)
2018
 
2017
 
2018
 
2017
Service cost
$
93

 
$
93

 
$
—

 
$
1

Interest cost
278

 
279

 
6

 
6

Expected return on plan assets
(562
)
 
(541
)
 
—

 
—

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

Recognized actuarial net loss (gain)
101

 
143

 
(2
)
 
(2
)
Net settlement and curtailment gain
(2
)
 
(2
)
 
—

 
—

Total net periodic benefit (income) cost
$
(102
)
 
$
(37
)
 
$
3

 
$
5


 
Pension Benefits
Six Months Ended June 30,
 
Other Postretirement Benefits
Six Months Ended June 30,
(dollars in millions)
2018
 
2017
 
2018
 
2017
Service cost
$
186

 
$
186

 
$
1

 
$
2

Interest cost
557

 
557

 
12

 
13

Expected return on plan assets
(1,125
)
 
(1,081
)
 
—

 
—

Amortization of prior service credit
(20
)
 
(18
)
 
(2
)
 
—

Recognized actuarial net loss (gain)
202

 
286

 
(4
)
 
(5
)
Net settlement and curtailment gain
(3
)
 
(1
)
 
—

 
—

Total net periodic benefit (income) cost
$
(203
)
 
$
(71
)
 
$
7

 
$
10