Commitments And Contingent Liabilities Commitments and Contingent Liabilities (Future Commitments Footnotes) (Details) $ in Billions	Dec. 31, 2016 USD ($)
Weyerhaeuser Pulp Business [Member]
Long-term Purchase Commitment [Line Items]
Unrecorded Unconditional Purchase Obligation	$ 1.1
2006 Transformation Plan and 2008 CPBR acquisition [Member]
Long-term Purchase Commitment [Line Items]
Unrecorded Unconditional Purchase Obligation	$ 2.0

Amount of the unrecorded obligation to transfer funds in the future for fixed or minimum amounts or quantities of goods or services at fixed or minimum prices (for example, as in take-or-pay contracts or throughput contracts).

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 440
-SubTopic 10
-Section 50
-Paragraph 4
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=73718637&loc=d3e25336-109308

Name:	us-gaap_UnrecordedUnconditionalPurchaseObligationBalanceSheetAmount
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant