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New Accounting Standard (Unaudited) Pension/Postretirement ASU (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Jun. 30, 2018 | Jun. 30, 2017
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Mineral Extraction Processing and Marketing Costs | $ 2,915 | $ 2,480 | $ 5,723 | $ 4,668
Cost of Revenue | 3,357 | 2,930 | 6,616 | 5,507
Selling, general and administrative expenses | 109 | 107 | 240 | 258
Mining exploration and research expenses | 24 | 19 | 45 | 33
Environmental obligations and shutdown costs | 59 | (21) | 68 | 4
Costs and Expenses | 3,504 | 3,025 | 6,913 | 5,769
Operating income (loss) | 1,664 | 686 | 3,123 | 1,283
Other Nonoperating Income (Expense) | $ 20 | (7) | $ 49 | 0
Scenario, Previously Reported [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Mineral Extraction Processing and Marketing Costs |  | 2,495 |  | 4,695
Cost of Revenue |  | 2,945 |  | 5,534
Selling, general and administrative expenses |  |  |  | 260
Mining exploration and research expenses |  |  |  | 34
Environmental obligations and shutdown costs |  | (19) |  | 8
Costs and Expenses |  | 3,042 |  | 5,803
Operating income (loss) |  | 669 |  | 1,249
Other Nonoperating Income (Expense) |  | 10 |  | 34
Accounting Standards Update 2017-05 [Member] | Restatement Adjustment [Member] |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |
Mineral Extraction Processing and Marketing Costs |  | (15) |  | (27)
Cost of Revenue |  | (15) |  | (27)
Selling, general and administrative expenses |  |  |  | (2)
Mining exploration and research expenses |  |  |  | (1)
Environmental obligations and shutdown costs |  | (2) |  | (4)
Costs and Expenses |  | (17) |  | (34)
Operating income (loss) |  | 17 |  | 34
Other Nonoperating Income (Expense) |  | $ (17) |  | $ (34)

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