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Long-Lived Assets (Impairment held for sale) (Details)
$ / shares in Units, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
$ / shares
Long-Lived Assets  
Aggregate loss on impairment of assets held for sale $ 556
Loss associated with impairment, net of tax (per share) | $ / shares $ 0.90
Aggregate loss on impairment of assets held for sale, tax effect $ 0