Goodwill And Other Intangibles (Amortized Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets [Line Items]
Gross Cost	$ 2,229	$ 1,906
Accumulated Amortization	792	632
Net Carrying Amount	1,437	1,274
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Gross Cost	1,970	1,672
Accumulated Amortization	639	518
Net Carrying Amount	1,331	1,154
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Cost	259	234
Accumulated Amortization	153	114
Net Carrying Amount	$ 106	$ 120