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Estimates (Schedule Of Non-Cash Investing And Financing Activities) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
NON-CASH INVESTING ACTIVITIES:      
Accrued capital expenditures $ 1,334 $ 1,030 $ 1,060
Right-of-Use Assets Obtained in Exchange for Liabilities 68 0 0
Right-of-Use Asset Obtained in Exchange for Finance Lease Liability 28    
Contribution of assets from noncontrolling interests 0 0 988
Net losses from subsidiary common unit transactions 0 (126) (56)
SUPPLEMENTAL CASH FLOW INFORMATION:      
Cash paid for interest, net of interest capitalized 1,932 1,870 1,914
Cash paid for income taxes $ 31 $ 508 $ 50