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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Schedule of components net (benefit) costs The following table shows the components of net (benefit) cost:
 
Pension Benefits
Other Postretirement and Postemployment Benefits
(in millions)
2018
2017
2018
2017
Three Months Ended September 30,
 
 
 
 
Service cost
$
—

$
—

$
21

$
22

Interest cost
195

213

32

35

Expected return on plan assets
(329
)
(286
)
(17
)
(17
)
Amortization of prior service credit
—

—

(7
)
(7
)
Recognized net actuarial loss
66

66

10

8

Settlements
—

—

—

—

Net (benefit) cost
$
(68
)
$
(7
)
$
39

$
41

 
 
 
 
 
Nine Months Ended September 30,
 
 
 
 
Service cost
$
—

$
—

$
64

$
66

Interest cost
586

639

95

105

Expected return on plan assets
(988
)
(858
)
(50
)
(51
)
Amortization of prior service credit
—

—

(20
)
(21
)
Recognized net actuarial loss
199

198

27

24

Settlements
4

—

—

—

Net (benefit) cost
$
(199
)
$
(21
)
$
116

$
123