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Consolidated Statement Of Equity - USD ($)
$ in Millions
Total
General Partner [Member]
Limited Partner [Member]
Class D Units [Member]
Series A Convertible Preferred Units [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Noncontrolling Interest [Member]
PennTex Acquisition [Member]
PennTex Acquisition [Member]
General Partner [Member]
PennTex Acquisition [Member]
Limited Partner [Member]
PennTex Acquisition [Member]
Class D Units [Member]
PennTex Acquisition [Member]
Series A Convertible Preferred Units [Member]
PennTex Acquisition [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
PennTex Acquisition [Member]
Noncontrolling Interest [Member]
Sale of Bakken Pipeline interest [Member]
Sale of Bakken Pipeline interest [Member]
General Partner [Member]
Sale of Bakken Pipeline interest [Member]
Limited Partner [Member]
Sale of Bakken Pipeline interest [Member]
Class D Units [Member]
Sale of Bakken Pipeline interest [Member]
Series A Convertible Preferred Units [Member]
Sale of Bakken Pipeline interest [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Sale of Bakken Pipeline interest [Member]
Noncontrolling Interest [Member]
Sale of Rover Pipeline interest [Member]
Sale of Rover Pipeline interest [Member]
General Partner [Member]
Sale of Rover Pipeline interest [Member]
Limited Partner [Member]
Sale of Rover Pipeline interest [Member]
Class D Units [Member]
Sale of Rover Pipeline interest [Member]
Series A Convertible Preferred Units [Member]
Sale of Rover Pipeline interest [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Sale of Rover Pipeline interest [Member]
Noncontrolling Interest [Member]
Subsidiary units issued for cash [Member]
Subsidiary units issued for cash [Member]
General Partner [Member]
Subsidiary units issued for cash [Member]
Limited Partner [Member]
Subsidiary units issued for cash [Member]
Class D Units [Member]
Subsidiary units issued for cash [Member]
Series A Convertible Preferred Units [Member]
Subsidiary units issued for cash [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Subsidiary units issued for cash [Member]
Noncontrolling Interest [Member]
Subsidiary units issued in certain acquisitions [Member]
Subsidiary units issued in certain acquisitions [Member]
General Partner [Member]
Subsidiary units issued in certain acquisitions [Member]
Limited Partner [Member]
Subsidiary units issued in certain acquisitions [Member]
Class D Units [Member]
Subsidiary units issued in certain acquisitions [Member]
Series A Convertible Preferred Units [Member]
Subsidiary units issued in certain acquisitions [Member]
Accumulated Other Comprehensive Income (Loss) [Member]
Subsidiary units issued in certain acquisitions [Member]
Noncontrolling Interest [Member]
Balance at Dec. 31, 2014 [1] $ 22,301 $ (1) $ 648 $ 22 $ 0 $ (5) $ 21,637                                                                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                    
Distributions to partners (1,090) (3) (1,084) (3) 0 0 0                                                                      
Distributions to noncontrolling interest (2,335) 0 0 0 0 0 (2,335)                                                                      
Subsidiary unit transactions 3,889 1 (524) (1) 0 0 4,415                                                                      
Capital contributions received from noncontrolling interest 875 0 0 0 0 0 875                                                                      
Non-cash compensation expense, net of units tendered by employees for tax withholdings 70 0 0 8 0 0 62                                                                      
Other, net (149) 0 (118) 0 0 0 (31)                                                                      
Units repurchased under buyback program (1,064) 0 (1,064) 0 0 0 0                                                                      
Issuance of common units 0 0 7 (7) 0 0 0                                                                      
Acquisition and disposition of noncontrolling interest (65) 0 0 0 0 0 (65)                                                                      
Partners' Capital Account, Acquisitions               $ 0                                                                    
Other comprehensive income, net of tax 60 0 0 0 0 5 55                                                                      
Net income 1,061 [1] 3 1,183 3 0 0 (128)                                                                      
Balance at Dec. 31, 2015 [1] 23,553 (2) (952) 22 0 0 24,485                                                                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                    
Distributions to partners (1,022) (3) (1,019) 0 0 0 0                                                                      
Distributions to noncontrolling interest (2,795) 0 0 0 0 0 (2,795)                                                                      
Distributions reinvested 0 0 (173) 0 173 0 0                                                                      
Subsidiary unit transactions                                                         $ 2,559 $ 0 $ 0 $ 0 $ 0 $ 0 $ 2,559 $ 307 $ 0 $ 0 $ 0 $ 0 $ 0 $ 307
Capital contributions received from noncontrolling interest 236 0 0 0 0 0 236                                                                      
Non-cash compensation expense, net of units tendered by employees for tax withholdings 52 0 0 (22) 0 0 74                                                                      
Other, net 43 (1) 30 0 0 0 14                                                                      
Issuance of common units 37 0 39 (2) 0 0                                                                      
Acquisition and disposition of noncontrolling interest (779) 0 (779) 0 0 0 0                                                                      
Partners' Capital Account, Acquisitions (236) 0 0 0 0 0 236 (307)                                                                    
Other comprehensive income, net of tax 4 0 0 0 0 0 4                                                                      
Net income 0 [1],[2] 3 983 0 9 0 (995)                                                                      
Balance at Dec. 31, 2016 [1] 22,431 (3) (1,871) 0 180 0 24,125                                                                      
Increase (Decrease) in Stockholders' Equity [Roll Forward]                                                                                    
Distributions to partners (1,010) (2) (1,008) 0 0 0 0                                                                      
Distributions to noncontrolling interest (2,999) 0 0 0 0 0 (2,999)                                                                      
Distributions reinvested 0 0 234 0 (234) 0 0                                                                      
Partners' Capital Account, Sale of Units 568 0 568 0 0 0 0                                                                      
Subsidiary unit transactions 3,235 0 (55) 0 (1) 0 3,291                                                                      
Capital contributions received from noncontrolling interest 2,202 0 0 0 0 0 2,202                                                                      
Non-cash compensation expense, net of units tendered by employees for tax withholdings 86 0 0 0 0 0 86                                                                      
Other, net (92) 0 0 0 0 0 (92)                                                                      
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests               $ (280) $ 0 $ (2) $ 0 $ 0 $ 0 $ (278)                                                        
Acquisition and disposition of noncontrolling interest                             $ (2,000) $ 0 $ (42) $ 0 $ 0 $ 0 $ (1,958) $ (1,478) $ 0 $ (2) $ 0 $ 0 $ 0 $ (1,476)                            
Partners' Capital Account, Acquisitions                   $ 0                                                                
Other comprehensive income, net of tax (5) 0 0 0 0 0 (5)                                                                      
Net income 2,366 2 915 0 37 0 1,412                                                                      
Balance at Dec. 31, 2017 $ 29,980 $ (3) $ (1,643) $ 0 $ 450 $ 0 $ 31,176                                                                      
[1] * As adjusted. See Note 2.
[2] * As adjusted. See Note 2 and Note 3.