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Supplemental Financial Statement Information (Schedule Of Statements Of Cash Flows) (Details) - USD ($)
$ in Millions
 1 Months Ended 12 Months Ended
Aug. 31, 2017
Jan. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
NET CASH FLOWS PROVIDED BY OPERATING ACTIVITIES     $ 4,429 $ 3,322 [1] $ 2,979 [1]
Cash paid for Bakken Pipeline Transaction     (303) (1,398) [1] (777) [1]
Proceeds from the sale of other assets     48 35 [1] 14 [1]
Contributions to unconsolidated affiliates     268 68 [1] 45 [1]
Capital expenditures     (8,444) (7,771) [1] (9,073) [1]
Net cash used in investing activities     (5,606) (8,982) [1] (9,735) [1]
Proceeds from borrowings     31,608 25,785 [1] 26,455 [1]
Repayments of long-term debt     (31,268) (19,076) [1] (19,828) [1]
Distributions to partners     (1,010) (1,022) [1] (1,090) [1]
Cash received from affiliate notes     0 5,317 [1] 0 [1]
Redemption of Preferred Units   $ (53)      
Proceeds from Issuance of Common Limited Partners Units $ 997   568 0 [1] 0 [1]
Units repurchased under buyback program     0 0 [1] (1,064) [1]
Debt issuance costs     (131) (52) [1] (75) [1]
Net cash provided by financing activities     953 5,927 [1] 6,785 [1]
Decrease in cash and cash equivalents     (131) (118) [1] (254) [1]
Cash and cash equivalents, beginning of period [1]   467 467 585 839
Cash and cash equivalents, end of period     336 467 [1] 585 [1]
Parent Company [Member]          
NET CASH FLOWS PROVIDED BY OPERATING ACTIVITIES     831 918 1,103
Cash paid for Bakken Pipeline Transaction     0 0 (817)
Contributions to unconsolidated affiliates     861 70 0
Capital expenditures     (1) (16) (19)
Payments to Acquire Additional Interest in Subsidiaries     7 0 0
Net cash used in investing activities     (855) (86) (836)
Proceeds from borrowings     2,219 225 3,672
Repayments of long-term debt     (1,881) (210) (1,985)
Distributions to partners     (1,010) (1,022) (1,090)
Cash received from affiliate notes     174 176 210
Proceeds from Issuance of Common Limited Partners Units     568 0 0
Units repurchased under buyback program     0 0 (1,064)
Debt issuance costs     (47) 0 (11)
Net cash provided by financing activities     23 (831) (268)
Decrease in cash and cash equivalents     (1) 1 (1)
Cash and cash equivalents, beginning of period   $ 2 2 1 2
Cash and cash equivalents, end of period     $ 1 $ 2 $ 1
[1] * As adjusted. See Note 2.