Shareholders' Equity (Accumulated other comprehensive income) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended									3 Months Ended
	Mar. 31, 2014		Mar. 31, 2013		Mar. 31, 2014 Currency Translation Adjustments [Member]	Mar. 31, 2013 Currency Translation Adjustments [Member]	Mar. 31, 2014 Unrealized Gains and Losses on Certain Investments [Member]	Mar. 31, 2013 Unrealized Gains and Losses on Certain Investments [Member]	Dec. 31, 2012 Unrealized Gains and Losses on Certain Investments [Member]	Mar. 31, 2014 Unrealized Gains and Losses on Derivative Instruments [Member]	Mar. 31, 2013 Unrealized Gains and Losses on Derivative Instruments [Member]	Mar. 31, 2014 Defined Benefit Pension Plans and Other Postretirement Benefits [Member]		Mar. 31, 2013 Defined Benefit Pension Plans and Other Postretirement Benefits [Member]
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (9,894)	[1]	$ (17,416)	[1]	$ 150	$ 214	$ (8)	$ (8)	$ (8)	$ (6)	$ 86	$ (10,030)		$ (17,708)
OCI before reclassifications	628	[1]	(17)	[1]	17	(23)	2			(11)	(26)	620		32
Amounts reclassified from AOCI	383	[1]	392	[1]						5	2	378	[2]	390	[2]
Net current period Other comprehensive income/(loss)	1,011	[1]	375	[1]	17	(23)	2			(6)	(24)	998		422
Ending Balance	(8,883)	[1]	(17,041)	[1]	167	191	(6)	(8)	(8)	(12)	62	(9,032)		(17,286)
Settlements, curtailments and amortization of actuarial gains/losses included in net periodic pension cost, net of tax of ($207) and ($220)	372		387
Settlements, curtailments and amortization of actuarial gains/losses included in net periodic pension cost, tax	$ (207)		$ (220)

[1] Net of tax.

[2] Primarily relates to settlements, curtailments and amortization of actuarial gains/losses for the three months ended March 31, 2014 and 2013 totaling $372 and $387 (net of tax of ($207) and ($220)) which is included in the net periodic pension cost of which a portion is allocated to production as inventoried costs.