XML 52 R42.htm IDEA: XBRL DOCUMENT v3.21.2
Risk Management (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Dec. 31, 2020
Net gain or (loss) recognized in the statement of income offset by regulatory accounting $ 114 $ (63) $ 265 $ 22  
Derivative, Net Liability Position, Aggregate Fair Value 118   118    
Collateral Already Posted, Aggregate Fair Value 23   23    
Collateral cash requirement 112   112    
Purchased power and fuel 259 $ 292 $ 613 $ 554  
Deposit Liabilities, Description     110 million    
Credit Derivative, Collateral Held Directly or by Third Parties     20 million    
Derivative, Collateral, Right to Reclaim Cash 3   $ 3    
Deposits, Wholesale 102   102   $ 0
Deposits $ 8   $ 8