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Schedule II - Valuation and Qualifying Accounts
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Schedule II - Valuation and Qualifying Accounts
Schedule II—Valuation and Qualifying Accounts
 
 
Balance,

 
 
 
 
 
Balance,

 
 
Beginning of

 
 
 
 
 
End of

(MILLIONS OF DOLLARS)
 
Period

 
Additions

 
Deductions

 
Period

Year Ended December 31, 2019
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
 
$
24

 
$
3

 
$
(6
)
 
$
21

 
 
 
 
 
 
 
 
 
Year Ended December 31, 2018
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
 
$
25

 
$
2

 
$
(3
)
 
$
24

 
 
 
 
 
 
 
 
 
Year Ended December 31, 2017
 
 
 
 
 
 
 
 
Allowance for doubtful accounts
 
$
30

 
$
3

 
$
(8
)
 
$
25