Property, Plant And Equipment (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Property, Plant And Equipment [Abstract]
Depreciation expense	$ 1,119	$ 1,096	$ 1,066
Interest capitalized	57	48	90
Rental expense for leased properties	270	269	273
Minimum rental payments under capital leases aggregated	197
Minimum rental payments under operating leases with initial or remaining terms of one year or more	1,311
Sublease payments under operating lease	4
Non-cancellable future rentals due from customers for equipment on operating leases	105
Accounts payable related to purchases of property, plant and equipment	$ 200	$ 265