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Supplemental Financial Statement Information Table - Balance Sheets (Details) - USD ($)
$ in Millions
Mar. 31, 2018
Jan. 01, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Sep. 30, 2016
Dec. 31, 2015
Liabilities associated with assets held for sale $ 0   $ 75        
Cash and cash equivalents 547   336 $ 353 $ 467    
Accounts receivable, net 3,590   4,504        
Accounts receivable from related companies 93   53        
Other current assets 304 $ 303 295        
Total current assets 6,593   10,683        
Property, plant and equipment, net 61,975 61,088 61,088        
Advances to and investments in unconsolidated affiliates 2,701   2,705        
Intangible assets, net 5,936 6,016 6,116        
Goodwill 4,768   4,768        
Other non-current assets, net 936 925 886        
Total assets 82,909   86,246        
Accounts payable 3,704   4,685        
Accounts payable to related companies 53   31        
Accrued and other current liabilities 2,944   2,582        
Total current liabilities 7,261   7,897        
Long-term debt, less current maturities 41,779   43,671        
Other non-current liabilities 1,244 $ 1,218 1,217        
Commitments and contingencies          
General Partner (3)   (3)        
Common Unitholders (1,696)   (1,643)        
Series A Convertible Preferred Units 519   450        
Total partners’ capital (1,180)   (1,196)        
Total liabilities and equity 82,909   86,246        
Parent Company [Member]              
Cash and cash equivalents 1   1     $ 3 $ 2
Accounts receivable from related companies 103   65        
Other current assets 1   1        
Total current assets 105   67        
Property, plant and equipment, net 27   27        
Advances to and investments in unconsolidated affiliates 5,805   6,082        
Goodwill 9   9        
Other non-current assets, net 8   8        
Total assets 5,954   6,193        
Accounts payable to related companies 1   0        
Interest payable 78   66        
Accrued and other current liabilities 8   4        
Total current liabilities 87   70        
Long-term debt, less current maturities 6,386   6,700        
Long-term notes payable – related companies 658   617        
Other non-current liabilities 3   2        
Commitments and contingencies          
General Partner (3)   (3)        
Common Unitholders (1,696)   (1,643)        
Series A Convertible Preferred Units 519   450        
Total partners’ capital (1,180)   (1,196)        
Total liabilities and equity $ 5,954   $ 6,193