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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2017
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit Cost (Income)
Net periodic benefit (income) cost consisted of the following: 
 
For the Nine Months Ended September 30,
 
For the Three Months Ended September 30,
 
Pension
 
Postretirement
 
Pension
 
Postretirement
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
(in millions)
Service cost
$
57

 
$
55

 
$
12

 
$
12

 
$
19

 
$
18

 
$
3

 
$
4

Interest cost
216

 
211

 
57

 
58

 
72

 
70

 
17

 
18

Expected return on plan assets
(451
)
 
(416
)
 
—

 
—

 
(151
)
 
(139
)
 
—

 
—

Amortization:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
147

 
130

 
19

 
19

 
49

 
43

 
3

 
3

Prior service cost (credit)
3

 
4

 
(28
)
 
(29
)
 
1

 
2

 
(9
)
 
(10
)
Termination and curtailment
—

 
20

 
—

 
—

 
—

 
—

 
—

 
—

Net periodic benefit
   (income) cost
$
(28
)
 
$
4

 
$
60

 
$
60

 
$
(10
)
 
$
(6
)
 
$
14

 
$
15