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Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions	Oct. 07, 2019	Oct. 01, 2019	Oct. 15, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018
Subsequent Event [Line Items]
Goodwill				$ 240			$ 240
Dividends declared, amount per common share				$ 0.17	$ 0.17	$ 0.17	$ 0.15	$ 0.15	$ 0.13	$ 0.13
Subsequent event
Subsequent Event [Line Items]
Payments to Acquire Businesses, Gross		$ 190
Intangible Assets, Net (Including Goodwill)		$ 170
Dividends Payable, Date Declared	Oct. 07, 2019
Dividends declared, amount per common share	$ 0.17		$ 0.17
Dividends Payable, Date to be Paid	Nov. 15, 2019
Dividends Payable, Date of Record	Nov. 01, 2019
Corporate and Other
Subsequent Event [Line Items]
Goodwill				$ 193			$ 193