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Employee Benefit Plans (Tables)
 3 Months Ended
Mar. 31, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of 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 March 31,
 
 
 
 
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