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Accounts Receivable
 12 Months Ended
Dec. 31, 2019
Receivables [Abstract]  
Accounts Receivable Accounts Receivable
(In millions)
2019
 
2018
Accounts receivable
$
2,052

 
$
2,143

Allowance for doubtful accounts
(111
)
 
(113
)
 
$
1,941

 
$
2,030