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Change in Accounting Principles (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Jan. 01, 2018 | Dec. 31, 2017 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Production and Operating Expenses |  | $ 1,367 | $ 1,222 | [1],[2] | $ 3,851 | $ 3,838 | [1],[2] |  |  |
Selling, General and Administrative Expense |  | 119 | 110 | [1],[2] | 336 | 302 | [1],[2] |  |  |
Exploration Expense |  | 103 | 73 | [1],[2] | 267 | 720 | [1],[2] |  |  |
Other Non Operating Expense |  | 10 | 77 | [1] | 350 | 421 | [1] |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Other accruals |  | 1,180 |  |  | 1,180 |  |  |  | $ 1,029 |
Total Current Liabilities |  | 7,401 |  |  | 7,401 |  |  |  | 9,397 |
Deferred Tax Liabilities, Noncurrent |  | 5,535 |  |  | 5,535 |  |  |  | 5,282 |
Deferred Credits and Other Liabilities |  | 1,330 |  |  | 1,330 |  |  |  | 1,269 |
Total Liabilities |  | 38,477 |  |  | 38,477 |  |  |  | 42,561 |
Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income , Net of Tax |  | (5,442) |  |  | (5,442) |  |  |  | (5,518) |
Retained Earnings (Accumulated Deficit) |  | 32,495 |  |  | 32,495 |  |  |  | 29,391 |
Stockholders' Equity Attributable to Parent |  | 31,950 |  |  | 31,950 |  |  |  | 30,607 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  | $ 32,079 | 30,712 |  | $ 32,079 | 30,712 |  |  | 30,801 | $ 35,226
Adjustments for New Accounting Pronouncement [Member] |  |  |  |  |  |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Other accruals |  |  |  |  |  |  |  | $ 1,133 | 1,029 |
Total Current Liabilities |  |  |  |  |  |  |  | 9,501 | 9,397 |
Deferred Tax Liabilities, Noncurrent |  |  |  |  |  |  |  | 5,251 | 5,282 |
Deferred Credits and Other Liabilities |  |  |  |  |  |  |  | 1,416 | 1,269 |
Total Liabilities |  |  |  |  |  |  |  | 42,781 | 42,561 |
Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income , Net of Tax |  |  |  |  |  |  |  | (5,460) | (5,518) |
Retained Earnings (Accumulated Deficit) |  |  |  |  |  |  |  | 29,113 | 29,391 |
Stockholders' Equity Attributable to Parent |  |  |  |  |  |  |  | 30,387 | 30,607 |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest |  |  |  |  |  |  |  | 30,581 | $ 30,801 |
ASU 2014-09 Revenue Recognition [Member] | Difference between Revenue Guidance in Effect before and after Topic 606 [Member] |  |  |  |  |  |  |  |  |  |
Liabilities [Abstract] |  |  |  |  |  |  |  |  |  |
Other accruals | [3] |  |  |  |  |  |  | 104 |  |
Total Current Liabilities | [3] |  |  |  |  |  |  | 104 |  |
Deferred Tax Liabilities, Noncurrent | [3] |  |  |  |  |  |  | (31) |  |
Deferred Credits and Other Liabilities | [3] |  |  |  |  |  |  | 147 |  |
Total Liabilities | [3] |  |  |  |  |  |  | 220 |  |
Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income , Net of Tax | [3] |  |  |  |  |  |  | 0 |  |
Retained Earnings (Accumulated Deficit) | [3] |  |  |  |  |  |  | (220) |  |
Stockholders' Equity Attributable to Parent | [3] |  |  |  |  |  |  | (220) |  |
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest | [3] |  |  |  |  |  |  | (220) |  |
ASU 2016-01 Accounting for Cenovus Shares [Member] | Restatement Adjustment [Member] |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income [Abstract] |  |  |  |  |  |  |  |  |  |
Accumulated Other Comprehensive Income , Net of Tax |  |  |  |  |  |  |  | 58 |  |
Retained Earnings (Accumulated Deficit) |  |  |  |  |  |  |  | $ (58) |  |
ASU 2017-07 Pension Costs [Member] |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Production and Operating Expenses |  |  | 1,222 |  |  | 3,838 |  |  |  |
Selling, General and Administrative Expense |  |  | 110 |  |  | 302 |  |  |  |
Exploration Expense |  |  | 73 |  |  | 720 |  |  |  |
Other Non Operating Expense |  |  | 77 |  |  | 421 |  |  |  |
ASU 2017-07 Pension Costs [Member] | Previously Reported [Member] |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Production and Operating Expenses |  |  | 1,224 |  |  | 3,849 |  |  |  |
Selling, General and Administrative Expense |  |  | 132 |  |  | 423 |  |  |  |
Exploration Expense |  |  | 75 |  |  | 724 |  |  |  |
Other Non Operating Expense |  |  | 51 |  |  | 285 |  |  |  |
ASU 2017-07 Pension Costs [Member] | Restatement Adjustment [Member] |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |
Production and Operating Expenses |  |  | (2) |  |  | (11) |  |  |  |
Selling, General and Administrative Expense |  |  | (22) |  |  | (121) |  |  |  |
Exploration Expense |  |  | (2) |  |  | (4) |  |  |  |
Other Non Operating Expense |  |  | $ 26 |  |  | $ 136 |  |  |  |
[1] | *Certain amounts have been reclassified to conform to the current-period presentation resulting from the adoption of ASU No. 2017-07.
[2] | See Note 2—Changes in Accounting Principles, for additional information.
[3] | For discussion of adjustments for ASU No. 2016-01 and ASC Topic 606, see Note ##NICE—Investment in Cenovus Energy and Note ##NSAOR—Sales and Other Operating Revenues, respectively.

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