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Asset Retirement Obligations - EGTS - Asset Retirement Obligation by Type (Details) - USD ($)
$ in Millions
Dec. 31, 2022
Dec. 31, 2021
Asset Retirement Obligations By Type [Line Items]    
Regulatory liabilities $ 7,070 $ 6,960
EGTS    
Asset Retirement Obligations By Type [Line Items]    
Regulatory liabilities 518 507
Cost of removal | EGTS    
Asset Retirement Obligations By Type [Line Items]    
Regulatory liabilities $ 24 $ 16