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Employee Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2017
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)
2017
2016
2017
2016
Three Months Ended September 30,
 
 
 
 
Service cost
$
—

$
—

$
22

$
17

Interest cost
213

229

35

37

Expected return on plan assets
(286
)
(226
)
(17
)
(18
)
Amortization of prior service credit
—

—

(7
)
(7
)
Recognized net actuarial loss
66

59

8

6

Net (benefit) cost
$
(7
)
$
62

$
41

$
35

 
 
 
 
 
Nine Months Ended September 30,
 
 
 
 
Service cost
$
—

$
—

$
66

$
51

Interest cost
639

687

105

111

Expected return on plan assets
(858
)
(678
)
(51
)
(54
)
Amortization of prior service credit
—

—

(21
)
(21
)
Recognized net actuarial loss
198

177

24

18

Net (benefit) cost
$
(21
)
$
186

$
123

$
105