Equity Activity: (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012
Accumulated Other Comprehensive Income (Loss) Net of Tax
Balance at the Beginning of the Period				$ (25,759)	$ (21,885)
Other comprehensive income before reclassifications				(1,067)	(252)
Amount reclassified from accumulated other comprehensive income				1,050	638
Total change for the period	(309)	[1]	(383)	(16)	387
Balance at the End of the Period	(25,774)		(21,498)	(25,774)	(21,498)
Net Unrealized Gains/(Losses) on Cash Flow Hedges
Accumulated Other Comprehensive Income (Loss) Net of Tax
Balance at the Beginning of the Period				(90)	71
Other comprehensive income before reclassifications				231	74
Amount reclassified from accumulated other comprehensive income				(63)	(91)
Total change for the period				168	(17)
Balance at the End of the Period	78		54	78	54
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) Net of Tax
Balance at the Beginning of the Period				1,733	1,767
Other comprehensive income before reclassifications				(1,448)	(385)
Amount reclassified from accumulated other comprehensive income				0	0
Total change for the period				(1,448)	(385)
Balance at the End of the Period	284		1,382	284	1,382
Net Change Retirement-Related Benefit Plans
Accumulated Other Comprehensive Income (Loss) Net of Tax
Balance at the Beginning of the Period				(27,406)	(23,737)
Other comprehensive income before reclassifications				150	41
Amount reclassified from accumulated other comprehensive income				1,115	739
Total change for the period				1,265	780
Balance at the End of the Period	(26,141)		(22,956)	(26,141)	(22,956)
Net Unrealized Gains/(Losses) on Available-For-Sale Securities
Accumulated Other Comprehensive Income (Loss) Net of Tax
Balance at the Beginning of the Period				4	13
Other comprehensive income before reclassifications				0	18
Amount reclassified from accumulated other comprehensive income				0	(10)
Total change for the period				0	9
Balance at the End of the Period	$ 4		$ 22	$ 4	$ 22

[1] Amounts may not add due to rounding.