Condensed Statements of Consolidated Cash Flows (anaudited) Condensed Statements of Consolidated Cash Flows (unaudited) - USD ($) $ in Millions	9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Cash Flows From (Used In) Operating Activities
Net earnings	$ 299	$ 242	[1]
Adjustments to Reconcile Net Earnings to Net Cash From Operating Activities [Abstract]
Depreciation and amortization expenses	178	139	[2]
(Gain) loss on asset disposals and impairments	(24)	3	[2]
Other operating activities	22	24	[2]
Changes in current assets and liabilities	56	11	[2]
Changes in noncurrent assets and liabilities	(12)	(5)	[2]
Net cash from operating activities	519	414	[2]
Cash Flows From (Used In) Investing Activities
Capital expenditures	(132)	(200)	[2]
Acquisitions	(673)	(30)	[2]
Proceeds from sale of assets	28	(4)	[2]
Net cash used in investing activities	(777)	(234)	[2]
Net Cash Provided by (Used in) Financing Activities [Abstract]
Borrowings under revolving credit agreements	309	761	[2]
Repayments under revolving credit agreements	(604)	(666)	[2]
Proceeds from debt offering	0	701	[2]
Repayments of term loan facility	0	(250)	[2]
Proceeds from issuance of common units, net of issuance costs	284	364	[2]
Proceeds from issuance of general partner units, net of issuance costs	6	0	[2]
Quarterly distributions to common unitholders	(300)	(234)	[2]
Quarterly distributions to general partner	(127)	(95)	[2]
Distributions in connection with acquisitions	(5)	(400)	[2]
Financing costs	0	(18)	[2]
Sponsor contributions of equity to the Predecessors	0	113	[2]
Capital contributions by affiliate	24	21	[2]
Other financing activities	(1)	4	[2]
Net cash from (used in) financing activities	(414)	301	[2]
Increase (Decrease) in Cash and Cash Equivalents	(672)	481	[2]
Cash and Cash Equivalents, Beginning of Period	688	16	[2]
Cash and Cash Equivalents, End of Period	$ 16	$ 497	[2]

[1] Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.

[2] Adjusted to include the historical results of the Predecessors. See Note 1 for further discussion.