Commitments And Contingent Liabilities (Narrative) (Details) $ in Millions	3 Months Ended	6 Months Ended	12 Months Ended
	Mar. 31, 2016 USD ($)	Jun. 30, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2015 USD ($)	Jun. 30, 2011 USD ($)
Loss Contingencies [Line Items]
Rent expense			$ 196	$ 157	$ 150
Accrual for environmental loss contingencies			128
Accrual for environmental loss contingencies, gross			138
Cass Lake Minnesota [Member]
Loss Contingencies [Line Items]
Accrual for environmental loss contingencies			49				$ 46
Kalamazoo River Superfund Site [Member]
Loss Contingencies [Line Items]
Loss contingency, damages sought, value	$ 37					$ 19
San Jacinto River Superfund Site [Member]
Loss Contingencies [Line Items]
Loss contingency, damages sought, value			$ 115
Harris County San Jacinto River Superfund Site [Member]
Loss Contingencies [Line Items]
Loss Contingency, Number of Plaintiffs			600
Georgia-Pacific Consumer Products LP, Fort James Corporation and Georgia Pacific LLC Cost Recovery Action [Member] | Kalamazoo River Superfund Site [Member]
Loss Contingencies [Line Items]
Loss contingency, damages sought, value			$ 79
Loss contingency, damages awarded, value			$ 50
Loss Contingencies, share of damages			15.00%
Ashley Furniture Lawsuit [Member]
Loss Contingencies [Line Items]
Loss contingency, number of defendants					10
Signature Industrial Services LLC et al. v. International Paper [Member]
Loss Contingencies [Line Items]
Disputed invoices, value			$ 1
Loss contingency, damages awarded, value		$ 125		$ 137