Summary of Significant Accounting Policies (Basic and Diluted Income) (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss) Available to Common Stockholders, Basic	$ 24,252	$ 76,434	$ 449,380	$ 65,244	$ (3,011)	$ 61,533	$ 127,688	$ 18,683	$ 615,310	$ 204,893	$ 153,044
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic									(3,081)	(2,588)	(2,678)
Net Income Loss Attributable To Common Stockholders Basic									612,229	202,305	150,366
Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted									3,081	0	0
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable									6,404	2,627	2,094
Net Income (Loss) Available to Common Stockholders, Diluted									$ 621,714	$ 204,932	$ 152,460
Weighted Average Number of Shares Outstanding, Basic	345,267	345,256	345,098	344,597	342,853	341,165	331,753	327,106	345,057	335,777	322,133
Weighted Average Limited Partnership Units Outstanding, Basic									3,582	4,308	4,392
Weighted Average Number Diluted Shares Outstanding Adjustment									3,558	361	187
Weighted Average Number of Shares Outstanding, Diluted	349,532	352,150	349,161	348,653	342,853	345,826	336,414	331,716	352,197	340,446	326,712
Duke Realty Limited Partnership [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss) Available to Common Stockholders, Basic	$ 24,444	$ 77,185	$ 454,142	$ 65,943	$ (3,122)	$ 62,328	$ 129,381	$ 18,933	$ 621,714	$ 207,520	$ 155,138
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic									(3,081)	(2,588)	(2,678)
Net Income Loss Attributable To Common Unitholders Basic									618,633	204,932	152,460
Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted									3,081	0	0
Diluted Net Income Loss Attributable To Common Unitholders									$ 621,714	$ 204,932	$ 152,460
Weighted Average Number of Shares Outstanding, Basic	348,769	348,760	348,728	348,292	346,934	345,545	336,139	331,493	348,639	340,085	326,525
Weighted Average Number Diluted Shares Outstanding Adjustment									3,558	361	187
Weighted Average Number of Shares Outstanding, Diluted	349,532	352,150	349,161	348,653	346,934	345,826	336,414	331,716	352,197	340,446	326,712