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Estimates, Significant Accounting Policies and Balance Sheet Detail Estimates (Schedule of Accounting Change) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Jan. 01, 2018
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other current assets	$ 350	$ 295		$ 303
Increase (Decrease) in Operating Capital	289	(192)	$ (179)
Inventories	1,677	2,022
Noncontrolling interest	10,291	31,176		31,122
Property, Plant and Equipment, Net	66,963	61,088		61,088
Intangible assets, net	6,000	6,116		6,016
Other non-current assets, net	1,006	886		925
Other non-current liabilities	1,184	1,217		$ 1,218
Cost of Goods and Services Sold	41,658	30,966	23,693
Operating expenses	3,089	2,644	2,336
Depreciation, depletion and amortization	2,859	2,554	2,216
Previous Accounting Guidance [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other current assets	338
Noncontrolling interest	10,355
Property, Plant and Equipment, Net	66,963
Intangible assets, net	6,134
Other non-current assets, net	947
Other non-current liabilities	1,183
Cost of Goods and Services Sold	42,389
Operating Expenses	3,045
Depreciation, depletion and amortization	2,888
Accounting Standards Update 2014-09 [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Other current assets	12	8
Noncontrolling interest	(64)	(54)
Property, Plant and Equipment, Net	0	0
Intangible assets, net	(134)	(100)
Other non-current assets, net	59	39
Other non-current liabilities	1	1
Cost of Goods and Services Sold	(731)
Operating Expenses	44
Depreciation, depletion and amortization	(29)
Natural gas sales
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	4,452	4,172	3,619
Natural gas sales \| Previous Accounting Guidance [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	4,452
Natural gas sales \| Accounting Standards Update 2014-09 [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	0
NGL sales
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	9,109	6,972	4,841
NGL sales \| Previous Accounting Guidance [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	9,071
NGL sales \| Accounting Standards Update 2014-09 [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	38
Crude sales
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	14,415	10,706	7,205
Crude sales \| Previous Accounting Guidance [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	14,403
Crude sales \| Accounting Standards Update 2014-09 [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	12
Gathering, transportation and other fees
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	6,797	4,435	4,172
Gathering, transportation and other fees \| Previous Accounting Guidance [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	7,526
Gathering, transportation and other fees \| Accounting Standards Update 2014-09 [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(729)
Refined product sales
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	18,345	11,975	10,097
Refined product sales \| Previous Accounting Guidance [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	18,393
Refined product sales \| Accounting Standards Update 2014-09 [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	(48)
Other
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	969	$ 2,263	$ 1,858
Other \| Previous Accounting Guidance [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	968
Other \| Accounting Standards Update 2014-09 [Member]
Error Corrections and Prior Period Adjustments Restatement [Line Items]
Revenue from Contract with Customer, Including Assessed Tax	$ 1