Summary Of Business And Significant Accounting Policies (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Percentage of ownership retained		19.90%
Future net cash distribution	$ 1,400
Distribution to Sylvamo Corporation		$ 130	$ 0	$ 0
Related Party Transaction, Other Revenues from Transactions with Related Party		$ 185