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Deferred Charges and Other Assets
 12 Months Ended
Dec. 31, 2023
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
DEFERRED CHARGES AND OTHER ASSETS
7.    DEFERRED CHARGES AND OTHER ASSETS

“Deferred charges and other assets, net” consisted of the following (in millions):
December 31,
20232022
Deferred turnaround and catalyst costs, net$2,382 $2,139 
Operating lease ROU assets, net (see Note 5)
1,136 1,114 
Investments in nonconsolidated joint ventures713 724 
Purchased compliance credits612 543 
Goodwill260 260 
Intangible assets, net183 202 
Income taxes receivable56 26 
Other1,284 863 
Deferred charges and other assets, net$6,626 $5,871 
Amortization expense for deferred turnaround and catalyst costs and intangible assets was $821 million, $745 million, and $695 million for the years ended December 31, 2023, 2022, and 2021, respectively.

The entire balance of goodwill is related to our Refining segment. See Note 17 for information on our reportable segments.