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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2018
Pension Plans  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Components of Net Costs
Net periodic pension cost consisted of the following:
 
U.S. Plans
 
Non-U.S. Plans
 
For the Three Months Ended
June 30,
 
For the Three Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
 
(in millions)
Service cost
$
10

 
$
10

 
$
37

 
$
38

Interest cost
15

 
16

 
50

 
49

Expected return on plan assets
(22
)
 
(25
)
 
(114
)
 
(108
)
Amortization:
 
 
 
 
 
 
 
Net loss from experience differences
9

 
9

 
42

 
40

Prior service cost/(benefit)
—

 
—

 
(1
)
 
—

Settlement losses and other expenses
8

 
18

 
—

 
1

Net periodic pension cost
$
20

 
$
28

 
$
14

 
$
20


 
U.S. Plans
 
Non-U.S. Plans
 
For the Six Months Ended
June 30,
 
For the Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
 
(in millions)
Service cost
$
22

 
$
22

 
$
75

 
$
77

Interest cost
30

 
31

 
102

 
97

Expected return on plan assets
(44
)
 
(50
)
 
(231
)
 
(212
)
Amortization:
 
 
 
 
 
 
 
Net loss from experience differences
20

 
17

 
84

 
81

Prior service cost/(benefit)
1

 
1

 
(1
)
 
(1
)
Settlement losses and other expenses
15

 
21

 
—

 
2

Net periodic pension cost
$
44

 
$
42

 
$
29

 
$
44
Postretirement Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Components of Net Costs
Net periodic postretirement health care benefit consisted of the following:
 
For the Three Months Ended
June 30,
 
For the Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
 
(in millions)
Service cost
$
1

 
$
2

 
$
3

 
$
4

Interest cost
3

 
3

 
7

 
7

Amortization:
 
 
 
 
 
 
 
     Net loss from experience differences
3

 
4

 
7

 
7

     Prior service credit (1)
(9
)
 
(10
)
 
(19
)
 
(20
)
Net periodic postretirement health care benefit
$
(2
)
 
$
(1
)
 
$
(2
)
 
$
(2
)

(1)
Amortization of prior service credit included gains of $8 million for the three months ended June 30, 2018 and June 30, 2017 and $16 million for the six months ended June 30, 2018 and June 30, 2017 related to a change in the eligibility requirement and a change in benefits to Medicare-eligible participants.
Postemployment Benefit Plans  
Defined Benefit Plan Disclosure [Line Items]  
Schedule of Components of Net Costs
Net periodic postemployment cost consisted of the following:
 
For the Three Months Ended
June 30,
 
For the Six Months Ended
June 30,
 
2018
 
2017
 
2018
 
2017
 
(in millions)
Service cost
$
1

 
$
2

 
$
3

 
$
3

Interest cost
1

 
1

 
2

 
2

Amortization of net gains
—

 
(1
)
 
(1
)
 
(2
)
Net periodic postemployment cost
$
2

 
$
2

 
$
4

 
$
3