Variable Interest Entities (Narrative) (Details) a in Thousands, $ in Millions	1 Months Ended	3 Months Ended	12 Months Ended
	Oct. 31, 2007 USD ($) a	Dec. 31, 2021 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Dec. 31, 2021 USD ($)	Dec. 31, 2006 USD ($) a	Aug. 31, 2021 USD ($)	Dec. 31, 2007 USD ($)
Variable Interest Entity [Line Items]
Long-term debt			$ 5,455	$ 4,816
Long-term debt, fair value			5,500	5,200
Deferred Income Taxes			1,552	1,732
Deferred Income Taxes and Tax Credits			156	773	$ 291
Two Thousand Seven Monetized Notes [Member]
Variable Interest Entity [Line Items]
Forestlands average sales | a	1,550
Amount of consideration received	$ 2,400		$ 2,400
Letters of credit downgrade period of replacement			30 days
Notes receivable, fair value disclosure			$ 2,300	2,300
Long-term debt, fair value			2,100	2,100
Letters of credit issued			2,400
Long-term debt								$ 2,100
Two Thousand And Fifteen Financing Entities [Member]
Variable Interest Entity [Line Items]
Forestlands average sales | a						5,600
Amount of consideration received						$ 4,800
Financing Receivable, before Allowance for Credit Loss							$ 4,800
Long-term debt							$ 4,200
equity in variable interest entities attributable to parent		$ 630			630
Expected cash tax payment		$ 72
Tax Adjustments, Settlements, and Unusual Provisions			252
Income tax examination, penalties and interest Expense			58
Deferred Income Taxes			163
Income Tax Examination, Interest Accrued			30
Deferred Income Taxes and Tax Credits			0	$ 604	$ 0
Two Thousand Seven Monetized Notes [Member]
Variable Interest Entity [Line Items]
Deferred tax liabilities, other			$ 485