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Post-retirement and Similar Obligations
 3 Months Ended
Mar. 31, 2020
Retirement Benefits [Abstract]  
Post-retirement and Similar Obligations Post-retirement and Similar Obligations
We made $10 million of pension contributions for the three months ended March 31, 2020. We expect to make additional contributions of $73 million for the remainder of 2020.
The components of net periodic benefit cost for pension benefits for the three months ended March 31, 2020 and 2019, respectively, consisted of:
 
 
Three Months Ended March 31,
 
 
2020
 
2019
(Millions)
 
 

 
 

Service cost
 
$
12

 
$
10

Interest cost
 
27

 
33

Expected return on plan assets
 
(50
)
 
(48
)
Amortization of:
 
 
 
 
Actuarial loss
 
31

 
30

Net Periodic Benefit Cost
 
$
20

 
$
25

The components of net periodic benefit cost for postretirement benefits for the three months ended March 31, 2020 and 2019, respectively, consisted of: 
 
 
Three Months Ended March 31,
 
 
2020
 
2019
(Millions)
 
 

 
 

Service cost
 
$
1

 
$
1

Interest cost
 
3

 
4

Expected return on plan assets
 
(2
)
 
(2
)
Amortization of:
 
 
 
 
Prior service costs
 
(2
)
 
(2
)
Net Periodic Benefit Cost
 
$
—

 
$
1