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Deferred Charges and Other Assets
 12 Months Ended
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
DEFERRED CHARGES AND OTHER ASSETS
8.    DEFERRED CHARGES AND OTHER ASSETS

“Deferred charges and other assets, net” consisted of the following (in millions):
December 31,
20202019
Deferred turnaround and catalyst costs, net$1,703 $1,778 
Operating lease ROU assets, net (see Note 6)
1,204 1,329 
Investments in unconsolidated joint ventures972 942 
Income taxes receivable589 525 
Intangible assets, net248 283 
Goodwill260 260 
Other565 514 
Deferred charges and other assets, net$5,541 $5,631 

Amortization expense for deferred turnaround and catalyst costs and intangible assets was $748 million, $759 million, and $668 million for the years ended December 31, 2020, 2019, and 2018, respectively.