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Retirement Benefits (Tables)
 3 Months Ended
Mar. 31, 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 March 31 was as follows (in millions):
 
First Quarter
 
Pension Benefits
 
 
 
 
 
U.S. Plans
 
Non-U.S. Plans
 
Worldwide OPEB
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
Service cost
$
133

 
$
136

 
$
134

 
$
152

 
$
12

 
$
14

Interest cost
381

 
367

 
159

 
176

 
49

 
49

Expected return on assets
(683
)
 
(722
)
 
(330
)
 
(334
)
 
—

 
—

Amortization of prior service costs/(credits)
36

 
36

 
9

 
6

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

 
(26
)
 
—

 
—

 
—

 
—

Separation programs/other
3

 
11

 
16

 
2

 
—

 
—

Settlements and curtailments
—

 
(15
)
 
—

 
—

 
—

 
—

Net periodic benefit cost/(income)
$
(130
)
 
$
(213
)
 
$
(12
)
 
$
2

 
$
31

 
$
36