Segments (Segment reconciliations) (Details 3) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
Pre-tax Income from continuing operations
Income from continuing operations before income taxes	$ 3,001	$ 3,183	[1]
Total reportable segments | Total Segments
Pre-tax Income from continuing operations
Income from continuing operations before income taxes	4,066	4,031	[1],[2]
Pre-tax reconciliations items
Pre-tax Income from continuing operations
Amortization of acquired intangible assets	(170)	(194)	[1]
Acquisition-related charges	0	(8)	[1]
Non-operating retirement-related (costs)/income	(442)	(123)	[1]
Eliminations of internal transactions
Pre-tax Income from continuing operations
Income from continuing operations before income taxes	(406)	(524)	[1]
Unallocated corporate amounts
Pre-tax Income from continuing operations
Income from continuing operations before income taxes	$ (48)	$ 0	[1]

[1] Reclassified to reflect discontinued operation presentation.

[2] Reclassified to conform with 2015 presentation and to reflect discontinued operations presentation.