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Debt (Details) - USD ($)
$ in Millions
Sep. 13, 2017
Mar. 06, 2017
3.375% due 2028    
Debt    
Face amount $ 300  
Interest rate (as a percent) 3.375%  
Net proceeds from issuance $ 298  
3.65% due 2027    
Debt    
Face amount   $ 350
Interest rate (as a percent)   3.65%
Net proceeds from issuance   $ 347