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