Commitments and Contingencies, Variable Interest Entities (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Amount Reflected in Consolidated Balance Sheets [Abstract]
Current assets	$ 0	$ 0
Property, plant and equipment, net	1	1
Other noncurrent assets	0	0
Variable interest entity, consolidated, carrying amount, assets	1	1
Current liabilities	0	0
Mortgages and other long-term debt payable	1	1
Other noncurrent liabilities	0	0
Variable Interest Entity, Consolidated, Carrying Amount, Liabilities	$ 1	$ 1