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Retirement Benefits (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Schedule of defined benefit plans expense [Table Text Block]
The pre-tax net periodic benefit cost/(income) 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
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
Service cost
$
133

 
$
136

 
$
154

 
$
146

 
$
13

 
$
13

Interest cost
382

 
367

 
155

 
168

 
50

 
49

Expected return on assets
(683
)
 
(721
)
 
(347
)
 
(318
)
 
—

 
—

Amortization of prior service costs/(credits)
36

 
36

 
9

 
6

 
(30
)
 
(27
)
Net remeasurement (gain)/loss
—

 
—

 
—

 
—

 
—

 
—

Separation programs/other
58

 
15

 
5

 
47

 
—

 
—

Settlements and curtailments
—

 
—

 
—

 
—

 
—

 
—

Net periodic benefit cost/(income)
$
(74
)
 
$
(167
)
 
$
(24
)
 
$
49

 
$
33

 
$
35

 
 
 
 
 
 
 
 
 
 
 
 
 
First Nine Months
 
Pension Benefits
 
 
 
 
 
U.S. Plans
 
Non-U.S. Plans
 
Worldwide OPEB
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
Service cost
$
400

 
$
408

 
$
413

 
$
449

 
$
37

 
$
40

Interest cost
1,144

 
1,100

 
487

 
517

 
148

 
147

Expected return on assets
(2,050
)
 
(2,165
)
 
(1,012
)
 
(981
)
 
—

 
—

Amortization of prior service costs/(credits)
107

 
107

 
27

 
19

 
(89
)
 
(82
)
Net remeasurement (gain)/loss
—

 
(26
)
 
—

 
—

 
—

 
—

Separation programs/other
70

 
29

 
24

 
65

 
—

 
1

Settlements and curtailments
—

 
(15
)
 
—

 
—

 
—

 
—

Net periodic benefit cost/(income)
$
(329
)
 
$
(562
)
 
$
(61
)
 
$
69

 
$
96

 
$
106