Income Taxes (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Contingency [Line Items]
Deferred income tax provision (benefit) for the effect of changes in non-U.S. and U.S. state tax rates	$ (2)	$ (44)	$ (13)
Income tax payments, net of refunds	162	349	$ 388
Accrual for the payment of estimated interest and penalties associated with unrecognized tax benefits	17	21
Tax positions for which the ultimate benefits are highly certain, but for which there is uncertainty about the timing of such benefits	16
Forestlands, related installment sales, and investment in subsidiary	(1,400)	$ (1,407)
Undistributed earnings of foreign subsidiaries	2,300
Two Thousand And Six Financing Entities [Member]
Income Tax Contingency [Line Items]
Deferred tax liabilities, other	887
Two Thousand Seven Monetized Notes [Member]
Income Tax Contingency [Line Items]
Deferred tax liabilities, other	488
Two Thousand Seven Monetized Notes [Member]
Income Tax Contingency [Line Items]
Deferred tax liabilities, other	488
Secretariat of the Federal Revenue Bureau of Brazil [Member]
Income Tax Contingency [Line Items]
Income tax examination, estimate of possible loss	114
Income tax examination, penalties and interest Expense	$ 367