Net Income (Loss) Per Common Share Reconciling the Components of Basic and Diluted Net Income (Loss) per Common Share (Details) - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to common shareholders	$ 494,817	$ 71,823	$ 749,996	$ 131,099
Less: dividends on participating securities	(298)	(352)	(1,033)	(1,064)
Basic net income attributable to common shareholders	494,519	71,471	748,963	130,035
Add back dividends on dilutive participating securities	298	0	1,033	0
Noncontrolling interest in earnings of common unitholders	4,848	638	7,347	1,164
Diluted net income attributable to common shareholders	$ 499,665	$ 72,109	$ 757,343	$ 131,199
Weighted average number of common shares/units outstanding, Basic	379,220	371,082	376,323	369,375
Weighted average Limited Partner Units outstanding	3,761	3,330	3,702	3,296
Other potential dilutive shares/units	1,643	422	1,786	420
Weighted average number of common shares/units and potential dilutive securities	384,624	374,834	381,811	373,091
Duke Realty Limited Partnership [Member]
Earnings Per Share, Basic, by Common Class, Including Two Class Method [Line Items]
Net income attributable to common shareholders	$ 499,665	$ 72,461	$ 757,343	$ 132,263
Less: dividends on participating securities	(298)	(352)	(1,033)	(1,064)
Basic net income attributable to common unitholders	499,367	72,109	756,310	131,199
Add back dividends on dilutive participating securities	298	0	1,033	0
Diluted net income attributable to common unitholders	$ 499,665	$ 72,109	$ 757,343	$ 131,199
Weighted average number of common shares/units outstanding, Basic	382,981	374,412	380,025	372,671
Other potential dilutive shares/units	1,643	422	1,786	420
Weighted average number of common shares/units and potential dilutive securities	384,624	374,834	381,811	373,091