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Asset Retirement Obligations (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Asset Retirement Obligation, Revision of Estimate $ (14) $ 17 $ 82
Asset Retirement Obligation, Accretion Expense 10 10 9
Asset Retirement Obligation, Liabilities Incurred $ 0 3 0
Document Period End Date Dec. 31, 2021    
Decommissioning Liability, Noncurrent $ 6    
Asset Retirement Obligation, Cash Paid to Settle 18 18 $ 9
Recorded Third-Party Environmental Recoveries, Amount 5 $ 5  
Asset Retirement Obligation, Liabilities Settled $ 6    
Asset Retirement Obligations, Significant Changes 12 million    
Environmental Costs Recognized, Recovery Credited to Expense $ 4    
Utility Plant [Domain]      
Asset Retirement Obligation, Accretion Expense 3    
Asset Retirement Obligation, Period Increase (Decrease) 23    
Non Utility [Member] [Member]      
Asset Retirement Obligation, Revision of Estimate 14    
Asset Retirement Obligation, Liabilities Incurred 3    
Asset Retirement Obligation, Period Increase (Decrease) $ 21