Goodwill and Other Intangibles (Amortized Intangible Assets) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Gross Cost	$ 3,874	$ 2,229
Accumulated Amortization	1,100	792
Net Carrying Amount	2,774	1,437
Customer relationships
Finite-Lived Intangible Assets [Line Items]
Gross Cost	3,494	1,970
Accumulated Amortization	897	639
Net Carrying Amount	2,597	1,331
Other
Finite-Lived Intangible Assets [Line Items]
Gross Cost	380	259
Accumulated Amortization	203	153
Net Carrying Amount	$ 177	$ 106