Goodwill and Intangible Assets, Net Definite-lived and Indefinite-lived Intangible Assets Table (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017
Definite-lived intangible assets:
Gross Carrying Amount	$ 712	$ 731
Accumulated Amortization	(273)	(249)
Net Carrying Value	439	482
Indefinite-lived intangible assets	62	62
Intangible assets, net	501	544
Customer relationships
Definite-lived intangible assets:
Gross Carrying Amount	396	397
Accumulated Amortization	(134)	(115)
Net Carrying Value	262	282
Other
Definite-lived intangible assets:
Gross Carrying Amount	316	334
Accumulated Amortization	(139)	(134)
Net Carrying Value	$ 177	$ 200