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Supplemental Financial Statement Information Schedule Of Statements of Cash Flows (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
NET CASH FLOWS PROVIDED BY OPERATING ACTIVITIES $ 2,139 $ 771
Contributions to unconsolidated affiliate 8 111
Capital expenditures (1,737) (1,408)
Net cash provided by (used in) investing activities (1,701) 244
Proceeds from borrowings 6,627 9,000
Repayments of long-term debt (8,541) (9,809)
Proceeds from affiliate 229 106
Distributions to partners (266) (251)
Units issued for cash 0 568
Debt issuance costs (117) (53)
Net cash provided by (used in) financing activities (2,967) (1,209)
CHANGE 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
Parent Company [Member]    
Gain (Loss) on Disposition of Assets 300 0
NET CASH FLOWS PROVIDED BY OPERATING ACTIVITIES 241 251
Contributions to unconsolidated affiliate 0 860
Net cash provided by (used in) investing activities 300 (860)
Proceeds from borrowings 54 2,017
Repayments of long-term debt (370) (1,733)
Proceeds from affiliate 41 43
Distributions to partners (266) (251)
Units issued for cash 0 568
Debt issuance costs 0 (34)
Net cash provided by (used in) financing activities (541) 610
CHANGE IN CASH AND CASH EQUIVALENTS 0 $ 1
Cash and cash equivalents, beginning of period 1  
Cash and cash equivalents, end of period $ 1