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Other Assets
 12 Months Ended
Dec. 31, 2020
Deferred Costs, Capitalized, Prepaid, and Other Assets Disclosure [Abstract]  
Other Assets Other Assets    
The components of other assets are as follows:
December 31,20202019
Other receivables from brokers, dealers, and clearing organizations$1,748 $235 
Receivables — interest, dividends, and other1,180 788 
Other investments (1)
1,019 633 
Operating lease ROU assets937 577 
Securities borrowed873 735 
Other securities owned at fair value687 718 
Customer contract receivables579 356 
Capitalized contract costs303 281 
Other457 264 
Total other assets$7,783 $4,587 
(1) Primarily CRA-related, including LIHTC investments; also includes investments in FHLB stock of $29 million and $35 million at December 31, 2020 and 2019, respectively, which can only be sold to the issuer at its par value. Any cash dividends received from investments in FHLB stock are recognized as interest revenue in the consolidated statements of income. During 2020, CSB and CSPB became members of the Federal Reserve and as a condition of membership, are required to hold Federal Reserve Stock. As such, other investments also includes investments in FRB stock of $191 million at December 31, 2020.

Capitalized contract costs
Capitalized contract costs relate to incremental costs of obtaining a contract with a customer, including sales commissions paid to employees for obtaining contracts with clients. These costs are amortized to expense on a straight-line basis over a period that is consistent with how the related revenue is recognized. Capitalized contract costs were $303 million and $281 million at December 31, 2020 and 2019, respectively. Amortization expense related to capitalized contract costs was $63 million and $55 million in 2020 and 2019, respectively, which was recorded in compensation and benefits expense on the consolidated statements of income.