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Benefit Plans (Tables)
 6 Months Ended
Jun. 30, 2017
Compensation and Retirement Disclosure [Abstract]  
Schedule of Net Periodic Benefit Cost (Income)
Net periodic benefit (income) cost consisted of the following: 
 
For the Six Months Ended June 30,
 
For the Three Months Ended June 30,
 
Pension
 
Postretirement
 
Pension
 
Postretirement
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
2017
 
2016
 
(in millions)
Service cost
$
38

 
$
37

 
$
9

 
$
8

 
$
19

 
$
19

 
$
5

 
$
4

Interest cost
144

 
141

 
40

 
40

 
72

 
70

 
20

 
19

Expected return on plan assets
(300
)
 
(277
)
 
—

 
—

 
(150
)
 
(139
)
 
—

 
—

Amortization:
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Net loss
98

 
87

 
16

 
16

 
48

 
43

 
8

 
9

Prior service cost (credit)
2

 
2

 
(19
)
 
(19
)
 
1

 
1

 
(10
)
 
(9
)
Termination and curtailment
—

 
20

 
—

 
—

 
—

 
—

 
—

 
—

Net periodic benefit (income) cost
$
(18
)
 
$
10

 
$
46

 
$
45

 
$
(10
)
 
$
(6
)
 
$
23

 
$
23