Commitments and Contingencies Loss Contingencies (Details) BRL in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2017 USD ($) defendant affiliate_corporations entity facility number_of_companies	Dec. 31, 2017 BRL	Dec. 31, 2016 USD ($)
Subcontract Relationship in MEA [Member]
Loss Contingencies [Line Items]
Provision for Doubtful Accounts	$ 20
Loss Contingency, Damages Sought, Value	$ 40
Fox River Site [Member]
Loss Contingencies [Line Items]
Portion Of Costs Below Threshold, Percentage	45.00%
Portion Of Costs Exceeding Threshold, Percentage	40.00%
Foreign Tax Authority [Member]
Loss Contingencies [Line Items]
Loss Contingency, Damages Sought, Value	$ 51	BRL 168
Kalamazoo River Site [Member]
Loss Contingencies [Line Items]
Total Corporation Plaintiffs | affiliate_corporations	3
Total Past Costs Being Tried	$ 50
Additional Companies Receiving General Notice Letters | number_of_companies	3
Total Additional Defendants | defendant	2
Fox River Site [Member]
Loss Contingencies [Line Items]
Number of Potentially Responsible Parties | entity	8
Number of Previously Owned Carbonless Copy Paper Manufacturing Facilities | facility	2
Threshold For Environmental Cleanup Costs	$ 75
Gross Loss Contingency Accrual	36		$ 58
Net Loss Contingency Accrual	35		27
Total Amount Received from Settlements with Insurance Carriers	$ 202
BAT And API Funding Obligation Under The Cost Sharing Agreement	50.00%
BAT And API Obligation Under The Cost Sharing Agreement	60.00%
Fox River Site [Member] | Fox River LLC [Member]
Loss Contingencies [Line Items]
Funding Remainder Other Current Asset	$ 0		$ 0
Minimum [Member] | Foreign Tax Authority [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	0
Maximum [Member] | Foreign Tax Authority [Member]
Loss Contingencies [Line Items]
Loss Contingency, Estimate of Possible Loss	$ 75