Leases And Commitments (Narrative) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009
Leases And Commitments [Abstract]
Future minimum rental payments for operating leases in 2012	$ 195
Future minimum rental payments for operating leases in 2013	156
Future minimum rental payments for operating leases in 2014	124
Future minimum rental payments for operating leases in 2015	95
Future minimum rental payments for operating leases in 2016	76
Future minimum rental payments for operating leases, thereafter	134
Rent expense for operating leases	$ 210	$ 146	$ 132
Warranty period terms minimum, days	90