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Estimates (Schedule Of Non-Cash Investing And Financing Activities) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
NON-CASH INVESTING ACTIVITIES:      
Accrued capital expenditures $ 1,060 $ 848 $ 910
Contribution of assets from noncontrolling interest 988 0 34
Net gains (losses) from subsidiary common unit transactions (56) 16 (526)
NON-CASH FINANCING ACTIVITIES:      
Units issued in Merger   236  
SUPPLEMENTAL CASH FLOW INFORMATION:      
Cash paid for interest, net of interest capitalized 1,914 1,922 1,800
Cash paid for (refund of) income taxes 50   72
Proceeds from Income Tax Refunds   (229)  
PennTex Acquisition [Member]      
NON-CASH FINANCING ACTIVITIES:      
Units issued in Merger   307 $ 0
Limited Partner [Member]      
NON-CASH FINANCING ACTIVITIES:      
Units issued in Merger   $ 0  
Limited Partner [Member] | PennTex Acquisition [Member]      
NON-CASH FINANCING ACTIVITIES:      
Units issued in Merger $ 0