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Supplemental Financial Statement Information (Schedule Of Statements Of Cash Flows) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
OPERATING ACTIVITIES $ 7,506 $ 4,429 $ 3,322
Cash paid for Bakken Pipeline Transaction (429) (303) (330)
Proceeds from the sale of other assets 87 48 35
Contributions to unconsolidated affiliates 26 268 68
Capital expenditures (7,407) (8,444) (7,771)
Net cash used in investing activities (7,075) (5,606) (8,982)
Proceeds from borrowings 29,001 31,608 25,785
Repayments of long-term debt (28,948) (31,268) (19,076)
Distributions to partners (1,684) (1,010) (1,022)
Cash received from affiliate notes 0 (255) 266
Proceeds from Issuance of Common Limited Partners Units 0 568 0
Units repurchased under buyback program (24) 0 0
Debt issuance costs (171) (131) (52)
Net cash (used in) provided by financing activities (3,082) 953 5,927
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
Parent Company [Member]      
OPERATING ACTIVITIES 2,245 831 918
Contributions to unconsolidated affiliates 250 861 70
Capital expenditures 0 (1) (16)
Payments to Acquire Additional Interest in Subsidiaries 0 7 0
Net cash used in investing activities 53 (855) (86)
Proceeds from borrowings 463 2,219 225
Repayments of long-term debt (1,651) (1,881) (210)
Distributions to partners (1,684) (1,010) (1,022)
Cash received from affiliate notes 575 174 176
Proceeds from Issuance of Common Limited Partners Units 0 568 0
Debt issuance costs 0 (47) 0
Net cash (used in) provided by financing activities (2,297) 23 (831)
Increase (decrease) in cash and cash equivalents 1 (1) 1
Cash and cash equivalents, beginning of period 1 2 1
Cash and cash equivalents, end of period 2 1 2
Increase (Decrease) in Notes Payable, Related Parties $ 303 $ 0 $ 0