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Receivables, net (Tables)
 12 Months Ended
Dec. 31, 2020
Receivables [Abstract]  
Rollforward of Allowance for Doubtful Accounts

Activity in the allowance for doubtful accounts was as follows (in millions):

 

 

December 31,

 

 

 

2020

 

 

2019

 

 

2018

 

Allowance for doubtful accounts

 

 

 

 

 

 

 

 

 

 

 

 

Beginning balance

 

$

16

 

 

$

27

 

 

$

29

 

Cumulative effect of accounting change

 

 

6

 

 

 

—

 

 

 

—

 

Additions (deductions) charged to expenses

 

 

9

 

 

 

(2

)

 

 

2

 

Charge-offs and other

 

 

(3

)

 

 

(9

)

 

 

(4

)

Ending balance

 

$

28

 

 

$

16

 

 

$

27