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Consolidated Statements Of Cash Flows - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
OPERATING ACTIVITIES    
Net income $ 489 $ 319
Reconciliation of net income to net cash provided by operating activities:    
Income (Loss) from Discontinued Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest 237 11
Depreciation and amortization 665 628
Deferred income taxes (12) 37
Amortization included in interest expense (4) (5)
Non-cash compensation expense 23 27
Losses on extinguishments of debt (106) (25)
Inventory valuation adjustments (25) 13
Distributions On Unvested Unit Awards (16) (9)
Equity in earnings of unconsolidated affiliates (79) (87)
Distributions from unconsolidated affiliates 61 46
Other non-cash (71) (59)
Net change in operating assets and liabilities, net of effects of acquisitions and deconsolidation 757 (185)
Net cash provided by operating activities 2,139 771
INVESTING ACTIVITIES    
Cash received from Bakken Pipeline Transaction 0 2,000
Cash paid for acquisitions, net of cash received (5) (330)
Capital expenditures (excluding allowance for equity funds used during construction) (1,737) (1,408)
Contributions in aid of construction costs 20 6
Contributions to unconsolidated affiliate 8 111
Distributions from unconsolidated affiliates in excess of cumulative earnings 26 90
Other 3 (3)
Net cash used in investing activities (1,701) 244
FINANCING ACTIVITIES    
Proceeds from borrowings 6,627 9,000
Repayments of long-term debt (8,541) (9,809)
Repayments of Related Party Debt 0 (268)
Payments for Repurchase of Common Stock (24) 0
Subsidiary units issued for cash 20 299
Units issued for cash 0 568
Distributions to partners (266) (251)
Debt issuance costs (117) (53)
Distributions to noncontrolling interests (893) (752)
Payments for Repurchase of Preferred Stock and Preference Stock 0 (53)
Capital contributions from noncontrolling interest 229 106
Other, net (2) 4
Net cash used in financing activities (2,967) (1,209)
Cash Provided by (Used in) Operating Activities, Discontinued Operations (485) 121
Cash Provided by (Used in) Investing Activities, Discontinued Operations 3,214 (40)
Increase (Decrease) in Assets Held-for-sale 11 (1)
Net Cash Provided by (Used in) Discontinued Operations 2,740 80
Increase (decrease) in cash and cash equivalents 211 (114)
Cash and cash equivalents, beginning of period 336 467
Cash and cash equivalents, end of period $ 547 $ 353