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Benefit Plans and Other Postretirement Benefits (Tables)
 3 Months Ended
Mar. 31, 2018
Retirement Benefits [Abstract]  
Components of Net Periodic Benefit Cost (Credit)
Components of Net Periodic Benefit Cost (Credit)
 
 
Three Months Ended March 31
 
 
2018
 
2017
 
2018
 
2017
(Millions of Dollars)
 
Pension Benefits
 
Postretirement Health
Care Benefits
Service cost
 
$
24

 
$
24

 
$
1

 
$
1

Interest cost (a)
 
33

 
36

 
5

 
6

Expected return on plan assets (a)
 
(52
)
 
(52
)
 
(6
)
 
(6
)
Amortization of prior service credit (a)
 
(1
)
 
—

 
(3
)
 
(3
)
Amortization of net loss (a)
 
27

 
26

 
2

 
1

Net periodic benefit cost (credit)
 
31

 
34

 
(1
)
 
(1
)
Costs not recognized due to the effects of regulation
 
—

 
(4
)
 
—

 
—

Net benefit cost (credit) recognized for financial reporting
 
$
31

 
$
30

 
$
(1
)
 
$
(1
)
 
 
 
 
 
 
 
 
 


(a)  
The components of net periodic cost other than the service cost component are included in the line item “other income, net” in the income statement or capitalized on the balance sheet as a regulatory asset.