Equity Activity - AOCI Rollforward (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Accumulated Other Comprehensive Income (Loss) (net of tax)
Balance at the Beginning of the Period			$ 14,424	$ 12,014
Other comprehensive income/(loss)	$ 394	$ 411	1,002	444
Balance at the End of the Period	15,889	13,837	15,889	13,837
Accumulated Other Comprehensive Income/(Loss)
Accumulated Other Comprehensive Income (Loss) (net of tax)
Balance at the Beginning of the Period			(29,607)	(27,875)
Other comprehensive income before reclassifications			135	(246)
Amount reclassified from accumulated other comprehensive income			867	690
Other comprehensive income/(loss)	394	411	1,002	444
Balance at the End of the Period	(28,604)	(27,432)	(28,604)	(27,432)
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	13	(127)	(160)	274
Amount reclassified from accumulated other comprehensive income			4	(368)
Other comprehensive income/(loss)	76	(333)	(156)	(94)
Balance at the End of the Period	(56)	298	(56)	298
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			351	(549)
Amount reclassified from accumulated other comprehensive income			0	0
Other comprehensive income/(loss)	(154)	169	351	(549)
Balance at the End of the Period	(3,112)	(2,292)	(3,112)	(2,292)
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			(34)	19
Amount reclassified from accumulated other comprehensive income			840	1,058
Other comprehensive income/(loss)	471	585	806	1,077
Balance at the End of the Period	(25,442)	(25,433)	(25,442)	(25,433)
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	1	(10)	(22)	10
Amount reclassified from accumulated other comprehensive income			23	0
Other comprehensive income/(loss)	1	(10)	1	10
Balance at the End of the Period	$ 6	$ (5)	$ 6	$ (5)