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Discontinued Operations Discontinued Operations - Narrative (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Income before income taxes $ 1,724   $ 1,796
Gain on discontinued operations, before tax   $ 0 1,709
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     1,709
Gain on discontinued operations, after tax     1,100
Income Tax Expense (Benefit) On Foreign Earnings Repatriated     175
Repatriation of foreign earnings     $ 1,300