Equity Activity (Details 2) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Accumulated Other Comprehensive Income (Loss) Net of Tax
Balance at the Beginning of the Period	$ (29,607)	$ (27,875)
Other comprehensive income before reclassifications	218	(343)
Amount reclassified from accumulated other comprehensive income	391	376
Total change for the period	608	33
Balance at the End of the Period	(28,998)	(27,842)
Net Unrealized Gains/(Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) Net of Tax
Balance at the Beginning of the Period	100	392
Other comprehensive income before reclassifications	(174)	401
Amount reclassified from accumulated other comprehensive income	(58)	(162)
Total change for the period	(232)	239
Balance at the End of the Period	133	631
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) Net of Tax
Balance at the Beginning of the Period	(3,463)	(1,742)
Other comprehensive income before reclassifications	505	(718)
Amount reclassified from accumulated other comprehensive income	0	0
Total change for the period	505	(718)
Balance at the End of the Period	(2,958)	(2,461)
Net Change Retirement-Related Benefit Plans
Accumulated Other Comprehensive Income (Loss) Net of Tax
Balance at the Beginning of the Period	(26,248)	(26,509)
Other comprehensive income before reclassifications	(91)	(46)
Amount reclassified from accumulated other comprehensive income	426	538
Total change for the period	335	492
Balance at the End of the Period	(25,913)	(26,017)
Net Unrealized Gains/(Losses) on Available-For-Sale Securities
Accumulated Other Comprehensive Income (Loss) Net of Tax
Balance at the Beginning of the Period	5	(15)
Other comprehensive income before reclassifications	(22)	20
Amount reclassified from accumulated other comprehensive income	23	0
Total change for the period	0	20
Balance at the End of the Period	$ 5	$ 5