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Clearing Operations (Schedule of Derivative Contracts) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2022
USD ($)
TWh
contract
Dec. 31, 2021
TWh
contract
Clearing Operations [Line Items]    
Market value of derivative contracts | $ $ 3,120  
Total number of cleared contracts (in contracts) | contract 86,516,863 81,846,168
Total volume in cleared power, in Terawatt hours (TWh) | TWh 413 813
Commodity and seafood options, futures and forwards    
Clearing Operations [Line Items]    
Market value of derivative contracts | $ $ 654  
Total number of cleared contracts (in contracts) | contract 288,142 536,252
Fixed-income options and futures    
Clearing Operations [Line Items]    
Market value of derivative contracts | $ $ 2,282  
Total number of cleared contracts (in contracts) | contract 21,992,124 23,140,918
Stock options and futures    
Clearing Operations [Line Items]    
Market value of derivative contracts | $ $ 141  
Total number of cleared contracts (in contracts) | contract 18,619,950 20,308,811
Index options and futures    
Clearing Operations [Line Items]    
Market value of derivative contracts | $ $ 43  
Total number of cleared contracts (in contracts) | contract 45,616,647 37,860,187