Leases And Commitments (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Future minimum rental payments for operating leases, due within a year	$ 205
Future minimum rental payments for operating leases, due in two years	165
Future minimum rental payments for operating leases, due in three years	125
Future minimum rental payments for operating leases, due in four years	97
Future minimum rental payments for operating leases, due in five years	74
Future minimum rental payments for operating leases, due thereafter	112
Rent expense for operating leases	$ 261	$ 226	$ 243
Maximum
Lessee leasing arrangements, operating leases, term of contract (in years)	20 years
Minimum
Warranty period terms minimum	90 days