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Goodwill (Tables)
9 Months Ended
Sep. 30, 2019
Goodwill and Intangible Assets Disclosure [Abstract]  
Summary of Changes in Goodwill
A summary of changes in the Company’s goodwill during the nine months ended September 30, 2019 is as follows (in millions):

Goodwill, net
December 31, 2018$10,039  
Impairments(10,039) 
September 30, 2019$—