Non-Mineral Leases (Other Information) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Non-Mineral Leases [Abstract]
Operating cash flows from operating leases	$ 204	$ 232	$ 203
Operating cash flows from finance leases	6	11	27
Financing cash flows from finance leases	73	255	81
Right-of-use assets obtained in exchange for operating lease liabilities	174	250	499
Right-of-use assets obtained in exchange for finance lease liabilities	$ 447	$ 426	$ 26