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General Information (Unaudited) (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2020
General Information [Abstract] |  |
COVID Response, Employee Separation Charges | $ 196 | $ 224
COVID Response, Production and Delivery Charges | 153 | 173
COVID Response, Depreciation, Depletion, and Amortization | 21 | 29
COVID Response, Selling, General, and Administrative Expense | 15 | 15
COVID Response, Mining Exploration and Research Expense | $ 7 | $ 7

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