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Clearing Operations (Schedule of Derivative Contracts Outstanding) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2016
USD ($)
contract
TW
Dec. 31, 2015
contract
TW
Clearing Operations [Line Items]    
Market value of derivative contracts | $ $ 1,607  
Total Number of Cleared Contracts | contract 97,302,481 105,913,773
Total volume in cleared power, in Terawatt hours (TWh) | TW 1,658 1,496
Commodity and seafood options, futures and forwards    
Clearing Operations [Line Items]    
Market value of derivative contracts | $ $ 613  
Total Number of Cleared Contracts | contract 3,530,746 3,055,073
Fixed-income options and futures    
Clearing Operations [Line Items]    
Market value of derivative contracts | $ $ 727  
Total Number of Cleared Contracts | contract 14,639,065 19,631,917
Stock options and futures    
Clearing Operations [Line Items]    
Market value of derivative contracts | $ $ 151  
Total Number of Cleared Contracts | contract 28,496,143 33,455,560
Index options and futures    
Clearing Operations [Line Items]    
Market value of derivative contracts | $ $ 116  
Total Number of Cleared Contracts | contract 50,636,527 49,771,223