(Schedule of Deferred Tax Assets and Liabilities) (Details) - USD ($) $ in Millions		Dec. 31, 2021	Dec. 31, 2020
Income Tax Disclosure [Abstract]
Postretirement benefit accruals		$ 84	$ 91
Pension obligations		0	280
Tax credits		199	293
Net operating and capital loss carryforwards		661	563
Compensation reserves		184	170
Lease obligations		92	99
Environmental reserves		104	111
Other		189	191
Gross deferred income tax assets		1,513	1,798
Less: valuation allowance (a)	[1]	(708)	(681)
Net deferred income tax asset		805	1,117
Intangibles		(140)	(114)
Investments		(56)	(251)
Right of use assets		(92)	(99)
Pension obligations		(34)	0
Plants, properties and equipment		(1,776)	(1,826)
Forestlands, related installment sales, and investment in subsidiary		(1,279)	(1,351)
Gross deferred income tax liabilities		(3,377)	(3,641)
Net deferred income tax liability		$ (2,572)	$ (2,524)

[1] The net change in the total valuation allowance for the years ended December 31, 2021 and 2020 was a increase of $27 million and an decrease of $(6) million, respectively.