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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 |  |  |

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