Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014	Dec. 31, 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	(5,607)		(5,053)
Cumulative Foreign Currency Translation Adjustments
Other comprehensive income from continuing operations, net of income taxes
Balance at the beginning of the period	(2,924)	(718)
Impact of business dispositions	108
Other comprehensive (loss) income before reclassifications	(911)	62
Net current period comprehensive( loss) income	(911)	62
Balance at the end of the period	(3,727)	(656)
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	(2,229)	(1,312)
Impact of business dispositions	19
Amounts reclassified from accumulated other comprehensive income	31	16
Net current period comprehensive( loss) income	31	16
Balance at the end of the period	(2,179)	(1,296)
Cumulative Unrealized Gains on Marketable Equity Securities
Other comprehensive income from continuing operations, net of income taxes
Balance at the beginning of the period	1	13
Other comprehensive (loss) income before reclassifications	173	1
Amounts reclassified from accumulated other comprehensive income		(1)
Net current period comprehensive( loss) income	173
Balance at the end of the period	174	13
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	99	5
Other comprehensive (loss) income before reclassifications	43	(1)
Amounts reclassified from accumulated other comprehensive income	(17)	1
Net current period comprehensive( loss) income	26
Balance at the end of the period	$ 125	$ 5