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Estimates (Schedule Of Non-Cash Investing And Financing Activities) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
NON-CASH INVESTING ACTIVITIES:      
Accrued capital expenditures $ 604 $ 1,334 $ 1,030
Right-of-Use Assets Obtained in Exchange for Liabilities 42 68 0
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability 0 28  
Net losses from subsidiary common unit transactions 0 0 (126)
SUPPLEMENTAL CASH FLOW INFORMATION:      
Cash paid for interest, net of interest capitalized 2,092 1,932 1,870
Proceeds from Income Tax Refunds $ (64)    
Cash paid for income taxes (net of refunds)   $ 31 $ 508