Summary of Significant Accounting Policies (Basic and Diluted Income) (Details) - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net Income (Loss) Available to Common Stockholders, Basic	$ 852,895	$ 299,915	$ 428,972
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic	(1,356)	(1,447)	(1,487)
Net Income Loss Attributable To Common Stockholders Basic	851,539	298,468	427,485
Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted	1,356	0	1,487
Noncontrolling Interest in Net Income (Loss) Operating Partnerships, Redeemable	8,354	2,663	3,678
Net Income (Loss) Available to Common Stockholders, Diluted	$ 861,249	$ 301,131	$ 432,650
Weighted Average Number of Shares Outstanding, Basic	377,673	370,057	362,234
Weighted Average Limited Partnership Units Outstanding, Basic	3,708	3,303	3,118
Weighted Average Number Diluted Shares Outstanding Adjustment	2,095	796	1,987
Weighted Average Number of Shares Outstanding, Diluted	383,476	374,156	367,339
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	$ 861,249	$ 302,578	$ 432,650
Participating Securities, Distributed and Undistributed Earnings (Loss), Basic	(1,356)	(1,447)	(1,487)
Net Income Loss Attributable To Common Unitholders Basic	859,893	301,131	431,163
Participating Securities, Distributed and Undistributed Earnings (Loss), Diluted	1,356	0	1,487
Diluted Net Income Loss Attributable To Common Unitholders	$ 861,249	$ 301,131	$ 432,650
Weighted Average Number of Shares Outstanding, Basic	381,381	373,360	365,352
Weighted Average Number Diluted Shares Outstanding Adjustment	2,095	796	1,987
Weighted Average Number of Shares Outstanding, Diluted	383,476	374,156	367,339