Discontinued Operations - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	May 01, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Pre-tax gain on sale of a discontinued operation	$ 0	$ 0	$ 1,718
Industrial Packaging Business | Industrial Packaging Business
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Proceeds from sale of business				$ 3,200
Pre-tax gain on sale of a discontinued operation			1,700
After-tax gain on sale of discontinued operations			1,100
Effective income tax rate reconciliation, repatriation of foreign earnings, amount			175
Foreign earnings repatriated			$ 1,300