Changes in Accumulated Other Comprehensive Income (Loss) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Other comprehensive income from continuing operations, net of income taxes
Balance at the beginning of the period			$ (5,053)
Balance at the end of the period	$ (7,211)		(7,211)
Cumulative Foreign Currency Translation Adjustments
Other comprehensive income from continuing operations, net of income taxes
Balance at the beginning of the period	(3,643)	$ (675)	(2,924)	$ (718)
Impact of business dispositions			108
Other comprehensive income (loss) before reclassifications	(645)	(1,096)	(1,472)	(1,053)
Net current period comprehensive income	(645)	(1,096)	(1,472)	(1,053)
Balance at the end of the period	(4,288)	(1,771)	(4,288)	(1,771)
Net Actuarial Losses and Prior Service Costs and Credits
Other comprehensive income from continuing operations, net of income taxes
Balance at the beginning of the period	(2,157)	(1,284)	(2,229)	(1,312)
Impact of business dispositions			19
Amounts reclassified from accumulated other comprehensive income	26	16	79	44
Net current period comprehensive income	26	16	79	44
Balance at the end of the period	(2,131)	(1,268)	(2,131)	(1,268)
Cumulative Unrealized Gains (Losses) on Marketable Equity Securities
Other comprehensive income from continuing operations, net of income taxes
Balance at the beginning of the period	696	9	1	13
Other comprehensive income (loss) before reclassifications	(1,596)	2	(763)	4
Amounts reclassified from accumulated other comprehensive income		(10)	(138)	(16)
Net current period comprehensive income	(1,596)	(8)	(901)	(12)
Balance at the end of the period	(900)	1	(900)	1
Cumulative Gains on Derivative Instruments Designated as Cash Flow Hedges
Other comprehensive income from continuing operations, net of income taxes
Balance at the beginning of the period	100	(2)	99	5
Other comprehensive income (loss) before reclassifications	41	67	89	66
Amounts reclassified from accumulated other comprehensive income	(33)	(2)	(80)	(8)
Net current period comprehensive income	8	65	9	58
Balance at the end of the period	$ 108	$ 63	$ 108	$ 63