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Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
CASH FLOWS FROM OPERATING ACTIVITIES:      
Net income $ 140 $ 4,825 $ 3,420
Reconciliation of net income to net cash provided by operating activities:      
Loss from discontinued operations 0 0 265
Depreciation, depletion and amortization 3,678 3,147 2,859
Deferred income taxes (210) (217) 7
Inventory valuation adjustments 82 (79) 85
Non-cash compensation expense 121 113 105
Impairment losses 2,880 74 431
Impairment of investments in unconsolidated affiliates 129 0 0
Losses on extinguishments of debt 75 18 112
Distributions On Unvested Unit Awards 41 38 38
Proceeds from Equity Method Investment, Distribution 220 290 328
Other non-cash 61 (182) (56)
Equity in earnings of unconsolidated affiliates (119) (302) (344)
Net change in operating assets and liabilities, net of effects of acquisitions and deconsolidations 47 (391) 234
Net Cash Provided by (Used in) Operating Activities, Continuing Operations 7,361 8,056 7,506
INVESTING ACTIVITIES:      
Cash received for sale of noncontrolling interest 0 93 0
Cash Acquired from Acquisition 0 0 461
Cash paid for acquisitions, net of cash received 0 (7) (429)
Capital expenditures, excluding allowance for equity funds used during construction (5,130) (5,960) (7,407)
Contributions in aid of construction costs 67 80 109
Contributions to unconsolidated affiliates (38) (523) (26)
Distributions from unconsolidated affiliates in excess of cumulative earnings 187 98 69
Proceeds from the sale of other assets 19 54 87
Other (3) 18 61
Net Cash Provided by (Used in) Investing Activities, Continuing Operations (4,898) (6,934) (7,075)
FINANCING ACTIVITIES:      
Proceeds from borrowings 24,440 22,583 29,001
Repayments of long-term debt (24,133) (20,101) (28,948)
Subsidiary units issued for cash 1,580 780 1,402
Distributions to partners (2,802) (3,054) (1,684)
Distributions to noncontrolling interests (1,651) (1,597) (3,117)
Payments of Ordinary Dividends, Preferred Stock and Preference Stock 49 53 24
Debt issuance costs (59) (117) (171)
Capital contributions from noncontrolling interests 222 348 649
Units repurchased under buyback program 0 (25) 0
Payments for Repurchase of Common Units by Subsidiary 0 0 24
Other, net 65 (14) (166)
Net cash used in financing activities (2,387) (1,250) (3,082)
Cash Provided by (Used in) Operating Activities, Discontinued Operations 0 0 (484)
Cash Provided by (Used in) Investing Activities, Discontinued Operations 0 0 3,207
Increase (Decrease) in Assets Held-for-sale 0 0 11
Net increase in cash and cash equivalents of discontinued operations 0 0 2,734
Increase (decrease) in cash and cash equivalents 76 (128) 83
Cash and cash equivalents, beginning of period 291 419 336
Cash and cash equivalents, end of period 367 291 419
SemGroup [Member]      
INVESTING ACTIVITIES:      
Cash paid for acquisitions, net of cash received $ 0 $ (787) $ 0