Retirement-Related Benefits (Details 1) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Retirement-Related Benefits:
Defined benefit and contribution pension plans - cost	$ 493	$ 398	$ 1,242	$ 872
Nonpension postretirement plans - cost	67	70	139	137
Total	$ 560	$ 468	$ 1,380	$ 1,009
Year-to-year percent change, defined benefit and contribution pension plans cost (as a percent)	23.80%		42.40%
Year-to-year percent change, Nonpension postretirement plans cost (as a percent)	(3.50%)		1.30%
Year-to-year percent change, total (as a percent)	19.70%		36.80%