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Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 3,365 $ 2,366 $ 0
Reconciliation of net income to net cash provided by operating activities:      
Loss from discontinued operations 265 177 462
Depreciation, depletion and amortization 2,859 2,554 2,216
Deferred income taxes (7) (1,871) (177)
Inventory valuation adjustments 85 (24) (97)
Non-cash compensation expense 105 99 70
Impairment losses 431 1,039 1,040
Impairment of investments in unconsolidated affiliates 0 313 308
Gains on acquisitions 0 0 (83)
Losses on extinguishments of debt 112 89 0
Distributions On Unvested Unit Awards (38) (35) (29)
Distributions from unconsolidated affiliates 328 297 268
Equity in earnings of unconsolidated affiliates (344) (144) (270)
Other non-cash 56 (239) (207)
Net change in operating assets and liabilities, net of effects of acquisitions and deconsolidations 289 (192) (179)
Net cash provided by operating activities 7,506 4,429 3,322
INVESTING ACTIVITIES:      
Cash Acquired from Acquisition 461 0 0
Cash paid for acquisitions, net of cash received (429) (303) (330)
Capital expenditures, excluding allowance for equity funds used during construction (7,407) (8,444) (7,771)
Contributions in aid of construction costs 109 31 71
Contributions to unconsolidated affiliates (26) (268) (68)
Distributions from unconsolidated affiliates in excess of cumulative earnings 69 135 135
Proceeds from the sale of other assets 87 48 35
Change in restricted cash 0 0 14
Other 61 (3) 0
Net cash used in investing activities (7,075) (5,606) (8,982)
FINANCING ACTIVITIES:      
Proceeds from borrowings 29,001 31,608 25,785
Repayments of long-term debt (28,948) (31,268) (19,076)
Cash received from affiliate notes 0 (255) 266
Proceeds from Issuance of Common Limited Partners Units 0 568 0
Subsidiary units issued for cash 1,402 3,235 2,559
Distributions to partners (1,684) (1,010) (1,022)
Distributions to noncontrolling interests (3,117) (2,961) (2,766)
Distributions to redeemable noncontrolling interest (24) 0 0
Redemption of preferred units 0 (53) 0
Debt issuance costs (171) (131) (52)
Capital contributions from noncontrolling interest 649 1,214 236
Units repurchased under buyback program (24) 0 0
Other, net (166) 6 (3)
Net cash (used in) provided by financing activities (3,082) 953 5,927
Cash Provided by (Used in) Operating Activities, Discontinued Operations (484) 136 93
Cash Provided by (Used in) Investing Activities, Discontinued Operations 3,207 (38) (483)
Increase (Decrease) in Assets Held-for-sale 11 (5) 5
Net increase (decrease) in cash and cash equivalents of discontinued operations 2,734 93 (385)
Increase (decrease) in cash and cash equivalents 83 (131) (118)
Cash and cash equivalents, beginning of period 336 467 585
Cash and cash equivalents, end of period 419 336 467
Bakken Pipeline [Member]      
INVESTING ACTIVITIES:      
Proceeds from Divestiture of Interest in Joint Venture 0 2,000 0
Rover Pipeline LLC [Member]      
INVESTING ACTIVITIES:      
Proceeds from Divestiture of Interest in Joint Venture 0 1,478 0
PennTex [Member]      
INVESTING ACTIVITIES:      
Cash paid for acquisitions, net of cash received 0 280 0
Vitol Acquisition [Member]      
INVESTING ACTIVITIES:      
Cash paid for acquisitions, net of cash received 0 0 769
PennTex Acquisition [Member]      
INVESTING ACTIVITIES:      
Cash paid for acquisitions, net of cash received $ 0 $ 0 $ 299