Divestitures (Narrative) (Details) ¥ in Millions, $ in Millions	3 Months Ended					12 Months Ended
	Sep. 30, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2017 CNY (¥)	Jun. 30, 2017 USD ($)	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Dec. 31, 2016 CNY (¥)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Discontinued operation, equity method investment retained after disposal, ownership interest after disposal						20.50%
Equity Method Investments, Fair Value Disclosure						$ 1,100
Net gain on transfer of North American Consumer Packaging business						(488)	$ 0	$ 0
Gain (loss) on disposition of business, net of taxes						40	0	0
Gain (Loss) on Sale of Assets and Asset Impairment Charges	$ (122)					(122)	(9)	(70)
Gain (loss) on sales of assets and asset impairment charges, net of tax						(81)
Net (gains) losses on sales and impairments of businesses						122	9	70
North American Consumer Packaging [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net gain on transfer of North American Consumer Packaging business						(488)
Gain (loss) on disposition of business, net of taxes						(364)
Cash provided by (used in) operating activities, discontinued operations						(25)	207	268
Cash provided by (used in) investing activities, discontinued operations						40	$ 111	114
Asia Foodservice [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of businesses			$ 18	¥ 129
Proceeds from sales of business, affiliate and productive assets | ¥				¥ 49
Number of locations sold			2	2
Proceeds from sale of notes receivable | ¥				¥ 80
Assets held-for-sale, long lived, fair value disclosure					$ 7
Impairment of long-lived assets to be disposed of					$ 9
IP Asia Packaging [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from divestiture of businesses								144	¥ 957
Impairment of long-lived assets to be disposed of								46
Severance costs								24
Income (loss) from individually significant component disposed of or held-for-sale, excluding discontinued operations, attributable to parent, before income tax								(83)
IP Asia Packaging [Member] | Xiamen Bridge Hexing Equity Investment Partnership Enterprise [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Noncash or part noncash acquisition, debt assumed								$ 55
Notes, loans and financing receivable, net, noncurrent						$ 0
Long-term Debt [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from issuance of debt		$ 660