Shareholders' Equity (Narrative) (Details) - USD ($)						1 Months Ended					3 Months Ended		6 Months Ended		35 Months Ended
	Jul. 23, 2019	Oct. 08, 2018	Aug. 02, 2018	Oct. 30, 2017	Jul. 29, 2016	Aug. 31, 2019	May 31, 2019	Apr. 30, 2019	Mar. 31, 2019	Feb. 28, 2019	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jul. 31, 2018
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, repurchased cost											$ 28,100,000	$ 35,000,000.0	$ 48,100,000	$ 105,000,000.0
Quarterly dividends declared								$ 0.175		$ 0.175
Dividends declared							$ 0.175		$ 0.175		$ 0.175		$ 0.175
Dividends payable, date to be paid, year and month							2019-05		2019-03
Subsequent Event [Member]
Equity Class Of Treasury Stock [Line Items]
Quarterly dividends declared	$ 0.175
Scenario Forecast [Member]
Equity Class Of Treasury Stock [Line Items]
Dividends declared						$ 0.175
Dividends payable, date to be paid, year and month						2019-08
Accelerated Share Repurchase [Member] | Deutsche Bank AG [Member]
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, expiration date													Oct. 08, 2018
Pre payment of repurchase program			$ 150,000,000.0
Repurchase program, Shares			1,766,004
Accelerated share repurchase remaining shares returned		389,825
Common Stock
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, expiration date					Jul. 31, 2018
Stock repurchase program, additional authorized amount				$ 250,000,000.0												$ 300,000,000.0
Shares repurchase program, extended expiration date				Oct. 31, 2020
Shares repurchase program, shares repurchased											316,005	620,569	647,691	1,785,816
Common Stock | Share Repurchase Program Excluding ASR [Member]
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, shares repurchased													600,000
Shares repurchase program, repurchased cost													$ 48,100,000
Shares repurchase program, average price per share													$ 74.24
Common Stock | Share Repurchase Program Including ASR [Member]
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, shares repurchased															8,300,000
Shares repurchase program, repurchased cost															$ 478,700,000
Shares repurchase program, average price per share															$ 57.42
Common Stock | Maximum [Member]
Equity Class Of Treasury Stock [Line Items]
Shares repurchase program, authorized amount					$ 150,000,000.0											$ 700,000,000.0