Income Tax (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended		9 Months Ended
	Sep. 18, 2015	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions		$ 792
Income Tax Expense (Benefit)		965	$ 858	$ 1,855	$ 1,916
Other expenses		4,533	$ 4,218	$ 12,665	$ 12,603
Income Tax Assessment, Income Taxes and Interest Paid	$ 444
Possible Change in Tax Assessment [Member]
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items]
Income Tax Expense (Benefit)		557
Other expenses		362
Net amount of other expense charge		$ 235