Fair Value of Financial Assets and Liabilities - Nonrecurring (Details) - Fair Value, Nonrecurring [Member] - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Carrying Amount [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	$ 1,596	$ 1,464
Business Combination, Contingent Consideration, Liability	4	4
Fair Value [Member]
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Long-term debt	1,373	1,449
Business Combination, Contingent Consideration, Liability	$ 4	$ 4