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Revenue ASC 606 Cumulative Effect Adjustments (Details) - USD ($) $ in Millions	Mar. 31, 2018	Dec. 31, 2017
Inventories	$ 64	$ 65
Property, plant and equipment, net	13,291	12,187
Long-term deferred revenue	49	42
Common unitholders - public	6,832	9,827
Cumulative Adjusted 606 Balance
Inventories		66
Property, plant and equipment, net		12,184
Long-term deferred revenue		39
ASC 606
Long-term deferred revenue	8	7	[1]
ASC 606 | Inventories
Cumulative effect of new accounting principle in period of adoption		1
ASC 606 | Property, plant and equipment
Cumulative effect of new accounting principle in period of adoption		(3)
ASC 606 | Long-term deferred revenue
Cumulative effect of new accounting principle in period of adoption		(3)
Limited Partners Common Units | Public
Common unitholders - public	$ 8,385	8,379
Limited Partners Common Units | Public | Cumulative Adjusted 606 Balance
Common unitholders - public		8,380
Limited Partners Common Units | Public | ASC 606 | Equity
Cumulative effect of new accounting principle in period of adoption		$ 1
[1] Balance represents ASC 606 portion of each respective line items.

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Amount after tax of increase (decrease) to equity or (increase) decrease to net assets, resulting from the cumulative effect adjustment of a new accounting principle applied in the period of adoption.

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The amount of ownership interest of different classes of partners in limited partnership.

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