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Other Income (Expense), Net (Tables)
 12 Months Ended
Dec. 31, 2019
Income Statement [Abstract]  
Components of Other Income (Expense), Net

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

 

Year Ended December 31,

 

2019

 

 

2018

 

 

2017

 

(millions)

 

 

 

 

 

 

 

 

 

 

 

 

Revenues from contracts with customers

 

$

4

 

 

$

5

 

 

$

—

 

Other income

 

 

19

 

 

 

141

 

 

 

45

 

Other expense

 

 

(57

)

 

 

(28

)

 

 

(32

)

Allowance for equity funds used during construction

 

 

1

 

 

 

11

 

 

 

15

 

Other income (expense), net

 

$

(33

)

 

$

129

 

 

$

28