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Related Party Transactions (Tables)
6 Months Ended
Jun. 30, 2019
Balance Sheet [Member]  
Related Party Transaction [Line Items]  
Schedule of Related Party Transactions [Table Text Block]
(In millions)
December 31, 2018
June 30, 2018
Accounts and notes receivable - net
$
1

$
1

Accounts payable
$
110

$
138