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Retirement Benefits (Tables)
 6 Months Ended
Jun. 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 June 30 was as follows (in millions):
 
Second Quarter
 
Pension Benefits
 
 
 
 
 
U.S. Plans
 
Non-U.S. Plans
 
Worldwide OPEB
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
Service cost
$
127

 
$
134

 
$
124

 
$
125

 
$
12

 
$
12

Interest cost
381

 
381

 
202

 
173

 
49

 
49

Expected return on assets
(674
)
 
(684
)
 
(350
)
 
(335
)
 
—

 
—

Amortization of prior service costs/(credits)
43

 
35

 
9

 
9

 
(36
)
 
(29
)
Net remeasurement (gain)/loss
—

 
—

 
11

 
—

 
—

 
—

Separation programs/other
3

 
9

 
65

 
3

 
—

 
—

Net periodic benefit cost/(income)
$
(120
)
 
$
(125
)
 
$
61

 
$
(25
)
 
$
25

 
$
32

 
 
 
 
 
 
 
 
 
 
 
 
 
First Half
 
Pension Benefits
 
 
 
 
 
U.S. Plans
 
Non-U.S. Plans
 
Worldwide OPEB
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
Service cost
$
255

 
$
267

 
$
242

 
$
259

 
$
24

 
$
24

Interest cost
762

 
762

 
397

 
332

 
97

 
98

Expected return on assets
(1,347
)
 
(1,367
)
 
(689
)
 
(665
)
 
—

 
—

Amortization of prior service costs/(credits)
85

 
71

 
19

 
18

 
(71
)
 
(59
)
Net remeasurement (gain)/loss
—

 
—

 
11

 
—

 
—

 
—

Separation programs/other
3

 
12

 
72

 
19

 
—

 
—

Net periodic benefit cost/(income)
$
(242
)
 
$
(255
)
 
$
52

 
$
(37
)
 
$
50

 
$
63