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Balance Sheet Components (Details)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Mar. 31, 2021
USD ($)
Dec. 31, 2020
USD ($)
Apr. 09, 2020
USD ($)
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]              
Accounts Receivable, Allowance for Credit Loss $ 22   $ 22   $ 20 $ 16  
Unbilled Receivables, Current 99   99     97  
Finite-Lived Intangible Assets, Accumulated Amortization 417   417     388  
Amortization of Intangible Assets 15 $ 16 30 $ 31      
Line of Credit Facility, Maximum Borrowing Capacity $ 600   $ 600        
Debt Instrument, Covenant Description     65.00%        
Ratio of Indebtedness to Net Capital 0.553   0.553        
Short-term debt $ 200   $ 200     150 $ 150
Line of Credit Facility, Remaining Borrowing Capacity 500   500        
Line of Credit Facility, Current Borrowing Capacity 220 500 220 500      
Letters of credit issued 69   69        
Authorized Short-Term Debt 900   900        
Long-term Debt, Current Maturities 20   20     $ 160  
Proceeds from Issuance of Long-term Debt     0 319      
Purchased power and fuel 185 $ 109 354 262      
Repayments of Long-term Debt     140 $ 98      
Letter of Credit [Member]              
SEC Schedule, 12-09, Valuation and Qualifying Accounts Disclosure [Line Items]              
Short-term debt $ 0   $ 0