Description of the Business and Summary of Significant Accounting Policies (Details) shares in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019 shares	Jun. 30, 2018 shares	Jun. 30, 2019 Segment shares	Jun. 30, 2018 shares
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Number of business segments | Segment			4
Stock Options
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	2	3	2	3
Restricted Stock Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Anti-dilutive securities (in shares)	3	3	3	3