Property, Plant and Equipment (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013	Dec. 31, 2013
Property, Plant and Equipment [Abstract]
Original cost	$ 112,580		$ 112,580		$ 116,470
Less accumulated depreciation and amortization	(47,120)		(47,120)		(47,643)
Property, plant and equipment - net	65,460		65,460		68,827
Depreciation and amortization	$ 2,494	$ 2,577	$ 6,995	$ 7,152