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Retirement Benefits (Tables)
 6 Months Ended
Jun. 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 June 30 was as follows (in millions):
 
Second Quarter
 
Pension Benefits
 
 
 
 
 
U.S. Plans
 
Non-U.S. Plans
 
Worldwide OPEB
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
Service cost
$
134

 
$
136

 
$
125

 
$
151

 
$
12

 
$
13

Interest cost
381

 
366

 
173

 
173

 
49

 
49

Expected return on assets
(684
)
 
(722
)
 
(335
)
 
(329
)
 
—

 
—

Amortization of prior service costs/(credits)
35

 
35

 
9

 
7

 
(29
)
 
(28
)
Net remeasurement (gain)/loss
—

 
—

 
—

 
—

 
—

 
—

Separation programs/other
9

 
3

 
3

 
16

 
—

 
1

Settlements and curtailments
—

 
—

 
—

 
—

 
—

 
—

Net periodic benefit cost/(income)
$
(125
)
 
$
(182
)
 
$
(25
)
 
$
18

 
$
32

 
$
35

 
 
 
 
 
 
 
 
 
 
 
 
 
First Half
 
Pension Benefits
 
 
 
 
 
U.S. Plans
 
Non-U.S. Plans
 
Worldwide OPEB
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
Service cost
$
267

 
$
272

 
$
259

 
$
303

 
$
24

 
$
27

Interest cost
762

 
733

 
332

 
349

 
98

 
98

Expected return on assets
(1,367
)
 
(1,444
)
 
(665
)
 
(663
)
 
—

 
—

Amortization of prior service costs/(credits)
71

 
71

 
18

 
13

 
(59
)
 
(55
)
Net remeasurement (gain)/loss
—

 
(26
)
 
—

 
—

 
—

 
—

Separation programs/other
12

 
14

 
19

 
18

 
—

 
1

Settlements and curtailments
—

 
(15
)
 
—

 
—

 
—

 
—

Net periodic benefit cost/(income)
$
(255
)
 
$
(395
)
 
$
(37
)
 
$
20

 
$
63

 
$
71