Shareholders' Equity (Schedule of changes in AOCI by component) (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended			6 Months Ended			3 Months Ended	6 Months Ended				3 Months Ended	6 Months Ended	3 Months Ended		6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013		Jun. 30, 2012	Jun. 30, 2013 Accumulated Translation Adjustment [Member]	Jun. 30, 2013 Accumulated Translation Adjustment [Member]	Jun. 30, 2013 Unrealized Gains and Losses on Certain Investments	Mar. 31, 2013 Unrealized Gains and Losses on Certain Investments	Dec. 31, 2012 Unrealized Gains and Losses on Certain Investments	Jun. 30, 2013 Unrealized Gains and Losses on Derivative Instruments	Jun. 30, 2013 Unrealized Gains and Losses on Derivative Instruments	Jun. 30, 2013 Defined Benefit Pension Plans and Other Postretirement Benefits		Jun. 30, 2013 Defined Benefit Pension Plans and Other Postretirement Benefits
Accumulated Other Comprehensive Income (Loss) [Line Items]
Beginning Balance	$ (17,041)	[1]		$ (17,416)	[1]		$ 191	$ 214	$ (8)	$ (8)	$ (8)	$ 62	$ 86	$ (17,286)		$ (17,708)
OCI before reclassifications	(127)	[1]		(144)	[1]		(65)	(88)				(63)	(89)	1		33
Amounts reclassified from AOCI	374	[1]		766	[1]							(5)	(3)	379	[2]	769	[2]
Net current period OCI	247	[1]		622	[1]		(65)	(88)				(68)	(92)	380		802
Balance June 30, 2013	(16,794)	[1]		(16,794)	[1]		126	126	(8)	(8)	(8)	(6)	(6)	(16,906)		(16,906)
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Net of Tax	377		327	755		653
Other Comprehensive Income (Loss), Reclassification, Pension and Other Postretirement Benefit Plans, Net Gain (Loss) Recognized in Net Periodic Benefit Cost, Tax	$ 216		$ 187	$ 431		$ 375

[1] Net of tax.

[2] Primarily relates to amortization of actuarial gains/losses for the six and three months ended June 30, 2013 totaling $755 and $377 (net of tax of $431 and $216) which is included in the net periodic pension cost of which a portion is allocated to production as inventoried costs.