Goodwill And Other Intangibles (Amortized Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Finite-Lived Intangible Assets [Line Items]
Gross Cost	$ 1,594	$ 1,457
Accumulated Amortization	468	421
Net Carrying Amount	1,126	1,036
Customer Lists
Finite-Lived Intangible Assets [Line Items]
Gross Cost	1,390	1,281
Accumulated Amortization	392	347
Net Carrying Amount	998	934
Other Intangible Assets
Finite-Lived Intangible Assets [Line Items]
Gross Cost	204	176
Accumulated Amortization	76	74
Net Carrying Amount	$ 128	$ 102