Discontinued Operations - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income before income taxes	$ 10		$ 1,806
Gain on discontinued operations, before tax		$ 0	1,719
Discontinued Operations, Disposed of by Sale [Member] | Industrial Packaging [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on discontinued operations, before tax			1,700
Gain on discontinued operations, after tax			1,100
Income tax expense related to repatriation of foreign earnings			175
Repatriation of foreign earnings			$ 1,300