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Goodwill (Tables)
 6 Months Ended
Jun. 30, 2020
Goodwill and Intangible Assets Disclosure [Abstract]  
Goodwill Rollforward
June 30,
(In millions)20202019
Beginning balance as of January 1, gross$95  $97  
Less: accumulated impairments—  —  
Beginning balance, net95  97  
Dispositions —  (2) 
Impairment(95) —  
Ending balance as of June 30, net$—  $95