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Post-retirement and Similar Obligations (Tables)
 6 Months Ended
Jun. 30, 2019
Retirement Benefits [Abstract]  
Components of Net Periodic Pension and Postretirement Benefits
The components of net periodic benefit cost for pension benefits for the three and six months ended June 30, 2019 and 2018, respectively, consisted of:
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2019
 
2018
 
2019
 
2018
(Millions)
 
 
 
 
 
 

 
 

Service cost
 
$
10

 
$
11

 
$
20

 
$
22

Interest cost
 
32

 
32

 
65

 
64

Expected return on plan assets
 
(48
)
 
(50
)
 
(96
)
 
(100
)
Amortization of:
 
 
 
 
 
 
 
 
Prior service costs
 
(1
)
 
1

 
(1
)
 
1

Actuarial loss
 
27

 
37

 
57

 
75

Net Periodic Benefit Cost
 
$
20

 
$
31

 
$
45

 
$
62

The components of net periodic benefit cost for postretirement benefits for the three and six months ended June 30, 2019 and 2018, respectively, consisted of: 
 
 
Three Months Ended June 30,
 
Six Months Ended June 30,
 
 
2019
 
2018
 
2019
 
2018
(Millions)
 
 
 
 
 
 

 
 

Service cost
 
$
—

 
$
1

 
$
1

 
$
2

Interest cost
 
4

 
5

 
8

 
9

Expected return on plan assets
 
(2
)
 
(2
)
 
(4
)
 
(4
)
Amortization of:
 
 
 
 
 
 
 
 
Prior service costs
 
(2
)
 
(2
)
 
(4
)
 
(4
)
Actuarial loss
 
(1
)
 
2

 
(1
)
 
3

Net Periodic Benefit Cost
 
$
(1
)
 
$
4

 
$
—

 
$
6