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Supplemental Financial Statement Information Table - Balance Sheets (Details) - USD ($)
$ in Millions
Mar. 31, 2019
Jan. 01, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Cash and cash equivalents $ 529   $ 419 $ 547 $ 336
Accounts receivable from related companies 119   111    
Other current assets 299   350    
Total current assets 7,127   6,750    
Property, plant and equipment, net 67,317 $ 66,962 66,963    
Advances to and investments in unconsolidated affiliates 2,653   2,642    
Total assets 89,773   88,246    
Accounts payable 3,965   3,493    
Accounts payable to related companies 53   59    
Accrued and other current liabilities 2,367 2,917 2,918    
Total current liabilities 6,695   9,310    
Long-term debt, less current maturities 46,373 43,379 43,373    
Other non-current liabilities 1,154 $ 1,172 1,184    
Commitments and contingencies      
Common Unitholders 20,693   20,606    
General Partner (5)   (5)    
Accumulated other comprehensive loss (34)   (42)    
Total partners’ capital 20,654   20,559    
Total liabilities and equity 89,773   88,246    
Parent Company [Member]          
Cash and cash equivalents 13   2 $ 1 $ 1
Accounts receivable from related companies 0   65    
Other current assets 1   1    
Total current assets 14   68    
Property, plant and equipment, net 23   23    
Advances to and investments in unconsolidated affiliates 26,124   26,581    
Total assets 26,161   26,672    
Accounts payable 0   2    
Accounts payable to related companies 55   65    
Interest payable 88   76    
Accrued and other current liabilities 1   3    
Total current liabilities 144   146    
Long-term debt, less current maturities 132   5,519    
Long-term notes payable – related companies 5,229   445    
Other non-current liabilities 2   3    
Common Unitholders 20,693   20,606    
General Partner (5)   (5)    
Accumulated other comprehensive loss (34)   (42)    
Total partners’ capital 20,654   20,559    
Total liabilities and equity $ 26,161   $ 26,672