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Retirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of defined benefit plans expense [Table Text Block]
The pre-tax net periodic benefit cost for our defined benefit pension and OPEB plans for the periods ended September 30 was as follows (in millions):
 
Third Quarter
 
Pension Benefits
 
 
 
 
 
U.S. Plans
 
Non-U.S. Plans
 
Worldwide OPEB
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
Service cost
$
128

 
$
133

 
$
116

 
$
154

 
$
13

 
$
13

Interest cost
381

 
382

 
190

 
155

 
49

 
50

Expected return on assets
(673
)
 
(683
)
 
(329
)
 
(347
)
 
—

 
—

Amortization of prior service costs/(credits)
43

 
36

 
9

 
9

 
(35
)
 
(30
)
Net remeasurement (gain)/loss
—

 
—

 
—

 
—

 
—

 
—

Separation programs/other
6

 
58

 
16

 
5

 
(1
)
 
—

Net periodic benefit cost/(income)
$
(115
)
 
$
(74
)
 
$
2

 
$
(24
)
 
$
26

 
$
33

 
 
 
 
 
 
 
 
 
 
 
 
 
First Nine Months
 
Pension Benefits
 
 
 
 
 
U.S. Plans
 
Non-U.S. Plans
 
Worldwide OPEB
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
Service cost
$
383

 
$
400

 
$
358

 
$
413

 
$
37

 
$
37

Interest cost
1,143

 
1,144

 
587

 
487

 
146

 
148

Expected return on assets
(2,020
)
 
(2,050
)
 
(1,018
)
 
(1,012
)
 
—

 
—

Amortization of prior service costs/(credits)
128

 
107

 
28

 
27

 
(106
)
 
(89
)
Net remeasurement (gain)/loss
—

 
—

 
11

 
—

 
—

 
—

Separation programs/other
9

 
70

 
88

 
24

 
(1
)
 
—

Net periodic benefit cost/(income)
$
(357
)
 
$
(329
)
 
$
54

 
$
(61
)
 
$
76

 
$
96