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Supplemental Financial Statement Information (Schedule Of Statements Of Cash Flows) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
NET CASH FLOWS PROVIDED BY OPERATING ACTIVITIES $ 3,269 $ 2,905 $ 2,885
Cash paid for Bakken Pipeline Transaction (1,398) (777) (2,367)
Proceeds from the sale of other assets 35 14 54
Contributions to unconsolidated affiliates 68 45 334
Capital expenditures (7,719) (9,021) (5,369)
Net cash used in investing activities (8,930) (9,683) (6,868)
Proceeds from borrowings 25,785 26,455 18,375
Repayments of long-term debt (19,076) (19,828) (13,886)
Distributions to partners (1,022) (1,090) (821)
Cash received from affiliate notes 5,317 0 0
Units repurchased under buyback program 0 (1,064) (1,000)
Debt issuance costs (52) (75) (77)
Net cash provided by financing activities 5,927 6,785 3,877
Increase (decrease) in cash and cash equivalents (118) (255) 257
Cash and cash equivalents, beginning of period 581 836 579
Cash and cash equivalents, end of period 463 581 836
Parent Company [Member]      
NET CASH FLOWS PROVIDED BY OPERATING ACTIVITIES 918 1,103 816
Cash paid for Bakken Pipeline Transaction 0 (817) 0
Contributions to unconsolidated affiliates 70 0 118
Capital expenditures (16) (19) 0
Payments to Acquire Additional Interest in Subsidiaries 0 0 (800)
Net cash used in investing activities (86) (836) (918)
Proceeds from borrowings 225 3,672 3,020
Repayments of long-term debt (210) (1,985) (1,142)
Distributions to partners (1,022) (1,090) (821)
Cash received from affiliate notes 176 210 54
Units repurchased under buyback program 0 (1,064) (1,000)
Debt issuance costs 0 (11) (15)
Net cash provided by financing activities (831) (268) 96
Increase (decrease) in cash and cash equivalents 1 (1) (6)
Cash and cash equivalents, beginning of period 1 2 8
Cash and cash equivalents, end of period $ 2 $ 1 $ 2