Financial Information By Industry Segment And Geographic Area (Operating Profit By Industry Segment) (Details) - USD ($) $ in Millions		3 Months Ended																12 Months Ended
		Dec. 31, 2017		Sep. 30, 2017		Jun. 30, 2017		Mar. 31, 2017		Dec. 31, 2016		Sep. 30, 2016		Jun. 30, 2016		Mar. 31, 2016		Dec. 31, 2017		Dec. 31, 2016		Dec. 31, 2015
Segment Reporting Information [Line Items]
Earnings (loss) from continuing operations before income taxes and equity earnings		$ 197	[1]	$ 457	[1]	$ (23)	[1]	$ 217	[1]	$ 244	[2]	$ 320	[2]	$ (76)	[2]	$ 307	[2]	$ 848	[1]	$ 795	[2]	$ 1,132
Interest expense, net																		(572)		(520)		(555)
Noncontrolling interests / equity earnings adjustment (b)	[3]																	(2)		1		8
Corporate items, net (a)	[4]																	91		121		96
Corporate special items, net (a)	[4]																	76		55		422
Non-operating pension expense		$ 386		$ 33		$ 34		$ 31		$ 37		$ 42		$ 487		$ 44		484		610		258
Operating Segments [Member]
Segment Reporting Information [Line Items]
Operating Profit																		2,069		2,102		2,471
Operating Segments [Member] | Industrial Packaging
Segment Reporting Information [Line Items]
Operating Profit																		1,547		1,741		1,938
Operating Segments [Member] | Global Cellulose Fibers
Segment Reporting Information [Line Items]
Operating Profit																		65		(179)		68
Operating Segments [Member] | Printing Papers
Segment Reporting Information [Line Items]
Operating Profit																		457		540		465
Corporate and other (c)
Segment Reporting Information [Line Items]
Interest expense, net																		$ 572		$ 520		$ 555

[1] Includes the following pre-tax charges (gains): 2017In millions Q1 Q2 Q3 Q4Gain on sale of investment in ArborGen $— $(14) $— $—Costs associated with the pulp business acquired in 2016 4 5 6 18Amortization of Weyerhaeuser inventory fair value step-up 14 — — —Holmen bargain purchase gain (6) — — —Abandoned property removal 2 5 7 6Kleen Products settlement — 354 — —Asia Foodservice sale — 9 — —Brazil Packaging wood supply accelerated amortization — — 10 —Debt extinguishment costs — — — 83Interest income on income tax refund claims — (4) — (1)Other items — (2) — —Non-operating pension expense 31 34 33 386Total $45 $387 $56 $492

[2] Includes the following pre-tax charges (gains): 2016In millions Q1 Q2 Q3 Q4Riegelwood mill conversion costs $9 $— $— $—India Packaging evaluation write-off — — 17 —Early debt extinguishment costs — — 29 —Write-off of certain regulatory pre-engineering costs — — 8 —Costs associated with the newly acquired pulp business — 5 7 19Asia Box impairment / restructuring 37 28 5 —Gain on sale of investment in Arizona Chemical (8) — — —Turkey mill closure — — — 7Amortization of Weyerhaeuser inventory fair value step-up — — — 19Non-operating pension expense 44 487 42 37Total $82 $520 $108 $82

[3] Operating profits for industry segments include each segment’s percentage share of the profits of subsidiaries included in that segment that are less than wholly-owned. The pre-tax noncontrolling interests and equity earnings for these subsidiaries is added here to present consolidated earnings from continuing operations before income taxes and equity earnings.

[4] Includes sales of $15 million in 2017, $42 million in 2016 and $931 million in 2015, operating profits (losses) of $0 million in 2017, $(2) million in 2016 and $(62) million in 2015, and corporate special items expense of $9 million in 2017, $9 million in 2016 and $184 million in 2015, from previously divested businesses