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Benefit Plans (Tables)
 9 Months Ended
Sep. 30, 2018
Retirement Benefits [Abstract]  
Schedule of Net Periodic Benefit (Income) Cost
Net periodic benefit cost (income) consisted of the following: 
 
For the Nine Months Ended September 30,
 
For the Three Months Ended September 30,
 
Pension
 
Postretirement
 
Pension
 
Postretirement
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
2018
 
2017
 
(in millions)
Service cost
$
61

 
$
57

 
$
13

 
$
12

 
$
20

 
$
19

 
$
4

 
$
3

Interest cost
207

 
216

 
52

 
57

 
69

 
72

 
15

 
17

Expected return on plan assets
(438
)
 
(451
)
 
(14
)
 
—

 
(146
)
 
(151
)
 
(5
)
 
—

Amortization:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
168

 
147

 
16

 
19

 
56

 
49

 
(1
)
 
3

Prior service cost (credit)
3

 
3

 
(31
)
 
(28
)
 
1

 
1

 
(10
)
 
(9
)
Net periodic benefit
cost (income)
$
1

 
$
(28
)
 
$
36

 
$
60

 
$
—

 
$
(10
)
 
$
3

 
$
14