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Employee Stock-based Compensation Plans - Employee Purchases and Aggregate Cost (Details) - Employee Stock Puchase Program - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Equity, Class of Treasury Stock [Line Items]
Employee share purchases (in shares)	0.5	0.6	0.6
Aggregate cost	$ 17	$ 15	$ 13

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Number of shares issued during the period as a result of an employee stock purchase plan.

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