Goodwill and Other Intangible Assets (Details 2) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Intangible assets
Impairment of Intangible Assets (Excluding Goodwill)	$ 5
Carrying amount of indefinite-lived intangible assets	641	$ 646
Carrying amount of indefinite-lived intangible assets - trade names	69	69
Gross Carrying Amount	608	567
Accumulated Amortization	(495)	(451)
Net Carrying Amount	113	116
Definite-lived intangible assets acquired during the year, amount assigned	$ 35
Definite-lived intangible assets acquired during the year, weighted-average amortization period	5 years 6 months
Aggregate amortization expense for definite-lived intangible assets	$ 37	30	$ 27
Estimated intangible amortization expense for next five years:
2020	28
2021	25
2022	21
2023	18
2024	6
Customer relationships [Member]
Intangible assets
Gross Carrying Amount	192	184
Accumulated Amortization	(146)	(134)
Net Carrying Amount	46	50
Contracts [Member]
Intangible assets
Gross Carrying Amount	219	215
Accumulated Amortization	(202)	(193)
Net Carrying Amount	17	22
Other [Member]
Intangible assets
Gross Carrying Amount	197	168
Accumulated Amortization	(147)	(124)
Net Carrying Amount	$ 50	$ 44