Summary Of Significant Accounting Policies (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2019 USD ($) segment gas_processing_plant	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Jan. 01, 2019 USD ($)
Other Ownership Interests [Line Items]
Present value of lease liabilities	$ 306			$ 325
Build-to-suit lease liability	327
Operating lease right-of-use assets	$ 280
Number of Gas Processing Plants | gas_processing_plant	11
Reportable operating segments | segment	1
Stock-based compensation awards general vesting period		3 years
Revenue	$ 9,671	$ 9,379
Allowances for doubtful accounts	$ 2
Pressure Pumping Assets
Other Ownership Interests [Line Items]
Board Designation Threshold Percent	5.00%
Pressure Pumping Assets | Pressure Pumping Assets
Other Ownership Interests [Line Items]
Shares acquired	16.00%
Minimum | Buildings
Other Ownership Interests [Line Items]
Estimated useful life	20 years
Minimum | Equipment, vehicles, furniture and fixtures and information technology
Other Ownership Interests [Line Items]
Estimated useful life	3 years
Minimum | Water infrastructure
Other Ownership Interests [Line Items]
Estimated useful life	3 years
Maximum | Buildings
Other Ownership Interests [Line Items]
Estimated useful life	39 years
Maximum | Equipment, vehicles, furniture and fixtures and information technology
Other Ownership Interests [Line Items]
Estimated useful life	10 years
Maximum | Water infrastructure
Other Ownership Interests [Line Items]
Estimated useful life	50 years
Natural Gas, Gathering, Transportation, Marketing and Processing [Member]
Other Ownership Interests [Line Items]
Third party expenses, processing plants and treating facilities	$ 43	36	$ 26
Revenue	$ 90	$ 78	$ 60
ASU 2016-02
Other Ownership Interests [Line Items]
Build-to-suit lease liability				$ (219)