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Other Income (Expense), Net
 12 Months Ended
Dec. 31, 2021
Income Statement [Abstract]  
Other Income (Expense), Net

17.  OTHER INCOME (EXPENSE), NET

Components of other income (expense), net are as follows:

 

Year Ended December 31,

 

2021

 

 

2020

 

 

2019

 

(millions)

 

    

 

 

 

 

 

 

 

 

 

Revenues from contracts with customers

 

$

—

 

 

$

1

 

 

$

4

 

Other income

 

 

11

 

 

 

13

 

 

 

19

 

Other expense

 

 

(18

)

 

 

(38

)

 

 

(57

)

Allowance for equity funds used during construction

 

 

5

 

 

 

1

 

 

 

1

 

Other expense, net

 

$

(2

)

 

$

(23

)

 

$

(33

)

 

 Non-service cost components of pension and other postretirement benefits are included in other expense.