Subsequent Events (Details) - USD ($) $ in Millions	Sep. 30, 2019	Aug. 01, 2019	Jun. 30, 2019
Subsequent Event [Line Items]
Stock Repurchase Program, Authorized Amount			$ 1,700
Subsequent Event [Member]
Subsequent Event [Line Items]
Stock Repurchase Program, Authorized Amount		$ 100
Five And One Over Four Senior Notes [Member] | Senior Notes [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount			$ 400
Five And One Over Four Senior Notes [Member] | Senior Notes [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Face Amount	$ 400
Five And One Over Two Senior Notes [Member] | Senior Notes [Member] | Subsequent Event [Member]
Subsequent Event [Line Items]
Debt Instrument, Repurchase Amount	$ 400