Digital Realty Trust (DLR) 10-Q 10 May 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	May 06, 2019
Entity Information [Line Items]
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Registrant Name	Digital Realty Trust, Inc.
Entity Central Index Key	0001297996
Current Fiscal Year End Date	--12-31
Entity Filer Category	Large Accelerated Filer
Entity Small Business	false
Entity Emerging Growth	false
Entity Common Stock, Shares Outstanding		208,282,930
Digital Realty Trust, L.P.
Entity Information [Line Items]
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Amendment Flag	false
Entity Registrant Name	Digital Realty Trust, L.P.
Entity Central Index Key	0001494877
Entity Filer Category	Non-accelerated Filer
Entity Small Business	false
Entity Emerging Growth	false

CONDENSED CONSOLIDATED BALANCE

CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Properties:
Land	$ 864,990	$ 859,113
Acquired ground leases	10,619	10,575
Buildings and improvements	15,510,434	15,610,992
Tenant improvements	602,278	574,336
Total investments in operating properties	16,988,321	17,055,016
Accumulated depreciation and amortization	(4,124,002)	(3,935,267)
Net investments in operating properties	12,864,319	13,119,749
Construction in progress and space held for development	1,584,328	1,621,928
Land held for future development	163,081	162,941
Net investments in properties	14,611,728	14,904,618
Investments in unconsolidated joint ventures	930,326	175,108
Net investments in real estate	15,542,054	15,079,726
Operating lease right-of-use assets	660,586
Cash and cash equivalents	123,879	126,700
Accounts and other receivables, net of allowance for doubtful accounts of $16,910 and $11,554 as of March 31, 2019 and December 31, 2018, respectively	328,009	299,621
Deferred rent	479,640	463,248
Acquired above-market leases, net	106,044	119,759
Goodwill	3,358,463	4,348,007
Acquired in-place lease value, deferred leasing costs and intangibles, net	2,580,624	3,144,395
Other assets	162,768	185,239
Total assets	23,342,067	23,766,695
LIABILITIES AND EQUITY
Unsecured senior notes, net	8,523,462	7,589,126
Secured debt, including premiums	105,493	685,714
Operating lease liabilities	725,470
Accounts payable and other accrued liabilities	922,571	1,164,509
Accrued dividends and distributions	0	217,241
Acquired below-market leases, net	192,667	200,113
Security deposits and prepaid rents	221,526	209,311
Total liabilities	12,341,890	12,892,653
Redeemable noncontrolling interests – operating partnership	17,678	15,832
Commitments and contingencies
Stockholders’ Equity:
Preferred stock/units	1,452,983	1,249,560
Common Stock: $0.01 par value per share, 315,000,000 shares authorized, 208,214,139 and 206,425,656 shares issued and outstanding as of March 31, 2019 and December 31, 2018, respectively	2,066	2,051
Partners’ capital:
Additional paid-in capital	11,492,766	11,355,751
Accumulated dividends in excess of earnings	(2,767,708)	(2,633,071)
Accumulated other comprehensive loss, net	(91,699)	(115,647)
Total stockholders’ equity	10,088,408	9,858,644
Noncontrolling Interests:
Noncontrolling interests in operating partnership	772,931	906,510
Noncontrolling interests in consolidated joint ventures	121,160	93,056
Total noncontrolling interests	894,091	999,566
Total equity	10,982,499	10,858,210
Total liabilities and equity/capital	23,342,067	23,766,695
Digital Realty Trust, L.P.
Properties:
Land	864,990	859,113
Acquired ground leases	10,619	10,575
Buildings and improvements	15,510,434	15,610,992
Tenant improvements	602,278	574,336
Total investments in operating properties	16,988,321	17,055,016
Accumulated depreciation and amortization	(4,124,002)	(3,935,267)
Net investments in operating properties	12,864,319	13,119,749
Construction in progress and space held for development	1,584,328	1,621,928
Land held for future development	163,081	162,941
Net investments in properties	14,611,728	14,904,618
Investments in unconsolidated joint ventures	930,326	175,108
Net investments in real estate	15,542,054	15,079,726
Operating lease right-of-use assets	660,586
Cash and cash equivalents	123,879	126,700
Accounts and other receivables, net of allowance for doubtful accounts of $16,910 and $11,554 as of March 31, 2019 and December 31, 2018, respectively	328,009	299,621
Deferred rent	479,640	463,248
Acquired above-market leases, net	106,044	119,759
Goodwill	3,358,463	4,348,007
Acquired in-place lease value, deferred leasing costs and intangibles, net	2,580,624	3,144,395
Other assets	162,768	185,239
Total assets	23,342,067	23,766,695
LIABILITIES AND EQUITY
Unsecured senior notes, net	8,523,462	7,589,126
Secured debt, including premiums	105,493	685,714
Operating lease liabilities	725,470
Accounts payable and other accrued liabilities	922,571	1,164,509
Accrued dividends and distributions	0	217,241
Acquired below-market leases, net	192,667	200,113
Security deposits and prepaid rents	221,526	209,311
Total liabilities	12,341,890	12,892,653
Redeemable noncontrolling interests – operating partnership	17,678	15,832
Commitments and contingencies
Stockholders’ Equity:
Preferred stock/units	1,452,983	1,249,560
Partners’ capital:
Common units, 208,214,139 and 206,425,656 units issued and outstanding as of March 31, 2019 and December 31, 2018, respectively	8,727,124	8,724,731
Limited Partners, 9,473,459 and 10,580,884 units issued and outstanding as of March 31, 2019 and December 31, 2018, respectively	776,614	911,256
Accumulated other comprehensive loss, net	(95,382)	(120,393)
Total partners’ capital	10,861,339	10,765,154
Noncontrolling Interests:
Noncontrolling interests in consolidated joint ventures	121,160	93,056
Total capital	10,982,499	10,858,210
Total liabilities and equity/capital	23,342,067	23,766,695
Global revolving credit facilities
LIABILITIES AND EQUITY
Line of credit	842,975	1,647,735
Global revolving credit facilities | Digital Realty Trust, L.P.
LIABILITIES AND EQUITY
Line of credit	842,975	1,647,735
Unsecured term loans, net
LIABILITIES AND EQUITY
Line of credit	807,726	1,178,904
Unsecured term loans, net | Digital Realty Trust, L.P.
LIABILITIES AND EQUITY
Line of credit	$ 807,726	$ 1,178,904

CONDENSED CONSOLIDATED BALANC_2

CONDENSED CONSOLIDATED BALANCE SHEETS (unaudited) (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounts and other receivables, net of allowance for doubtful accounts	$ 16,910	$ 11,554
Preferred stock, par value (in dollars per share/unit)	$ 0.01	$ 0.01
Preferred stock, authorized (shares)	110,000,000	110,000,000
Preferred stock, issued (shares)	59,050,000	50,650,000
Preferred stock, outstanding (shares)	59,050,000	50,650,000
Common stock, par value (in dollars per share/unit)	$ 0.01	$ 0.01
Common stock, authorized (shares)	315,000,000	315,000,000
Common stock, shares, issued (shares)	208,214,139	206,425,656
Common stock, shares, outstanding (shares)	208,214,139	206,425,656
Digital Realty Trust, L.P.
Accounts and other receivables, net of allowance for doubtful accounts	$ 16,910,000	$ 11,554,000
Preferred units, issued (units)	59,050,000	50,650,000
Preferred units, outstanding (units)	59,050,000	50,650,000
Common units, issued (units)	208,214,139	206,425,656
Common units, outstanding (units)	208,214,139	206,425,656
Limited Partners' units, issued (units)	9,473,459	10,580,884
Limited Partners' units outstanding (units)	9,473,459	10,580,884

CONDENSED CONSOLIDATED INCOME S

CONDENSED CONSOLIDATED INCOME STATEMENTS (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Operating Revenues:
Total operating revenues	$ 814,515	$ 744,368
Operating Expenses:
Rental property operating and maintenance	254,954	225,640
Property taxes and insurance	40,306	38,994
Depreciation and amortization	311,486	294,789
General and administrative	53,459	36,523
Transactions and integration	2,494	4,178
Impairment of investments in real estate	5,351	0
Other	4,922	431
Total operating expenses	672,972	600,555
Operating income	141,543	143,813
Other Income (Expenses):
Equity in earnings of unconsolidated joint ventures	9,217	7,410
Gain on deconsolidation / sale of properties, net	67,497	39,273
Interest and other income (expense), net	21,444	(42)
Interest expense	(101,552)	(76,985)
Tax expense	(4,266)	(3,374)
Loss from early extinguishment of debt	(12,886)	0
Net income	120,997	110,095
Net income attributable to noncontrolling interests	(4,185)	(3,468)
Net income attributable to Digital Realty Trust, Inc./Digital Realty Trust, L.P.	116,812	106,627
Preferred stock dividends, including undeclared dividends	(20,943)	(20,329)
Net income available to common stock/unitholders	$ 95,869	$ 86,298
Net income per share/unit available to common stockholders/unitholders:
Basic (in dollars per share/unit)	$ 0.46	$ 0.42
Diluted (in dollars per share/unit)	$ 0.46	$ 0.42
Weighted average common shares/units outstanding:
Basic (shares/units)	207,809,383	205,714,173
Diluted (shares/units)	208,526,249	206,507,476
Digital Realty Trust, L.P.
Operating Revenues:
Total operating revenues	$ 814,515	$ 744,368
Operating Expenses:
Rental property operating and maintenance	254,954	225,640
Property taxes and insurance	40,306	38,994
Depreciation and amortization	311,486	294,789
General and administrative	53,459	36,523
Transactions and integration	2,494	4,178
Impairment of investments in real estate	5,351	0
Other	4,922	431
Total operating expenses	672,972	600,555
Operating income	141,543	143,813
Other Income (Expenses):
Equity in earnings of unconsolidated joint ventures	9,217	7,410
Gain on deconsolidation / sale of properties, net	67,497	39,273
Interest and other income (expense), net	21,444	(42)
Interest expense	(101,552)	(76,985)
Tax expense	(4,266)	(3,374)
Loss from early extinguishment of debt	(12,886)	0
Net income	120,997	110,095
Net income attributable to noncontrolling interests	115	12
Net income attributable to Digital Realty Trust, Inc./Digital Realty Trust, L.P.	121,112	110,107
Preferred stock dividends, including undeclared dividends	(20,943)	(20,329)
Net income available to common stock/unitholders	$ 100,169	$ 89,778
Net income per share/unit available to common stockholders/unitholders:
Basic (in dollars per share/unit)	$ 0.46	$ 0.42
Diluted (in dollars per share/unit)	$ 0.46	$ 0.42
Weighted average common shares/units outstanding:
Basic (shares/units)	217,039,295	214,009,460
Diluted (shares/units)	217,756,161	214,802,763
Rental and other services
Operating Revenues:
Total operating revenues	$ 812,030	$ 592,298
Rental and other services | Digital Realty Trust, L.P.
Operating Revenues:
Total operating revenues	812,030	592,298
Tenant reimbursements
Operating Revenues:
Total operating revenues	0	150,079
Tenant reimbursements | Digital Realty Trust, L.P.
Operating Revenues:
Total operating revenues	0	150,079
Fee income and other
Operating Revenues:
Total operating revenues	2,485	1,991
Fee income and other | Digital Realty Trust, L.P.
Operating Revenues:
Total operating revenues	$ 2,485	$ 1,991

CONDENSED CONSOLIDATED STATEMEN

CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Net income	$ 120,997	$ 110,095
Other comprehensive income (loss):
Foreign currency translation adjustments	9,193	(3,743)
Reclassification of foreign currency translation adjustment due to deconsolidation of Ascenty	21,687	0
(Decrease) increase in fair value of interest rate swaps and foreign currency hedges	(3,775)	8,616
Reclassification to interest expense from interest rate swaps	(2,094)	(235)
Comprehensive income	146,008	114,733
Comprehensive income attributable to noncontrolling interests	(5,249)	(3,648)
Comprehensive income attributable to Digital Realty Trust, Inc./Digital Realty Trust, L.P.	140,759	111,085
Digital Realty Trust, L.P.
Net income	120,997	110,095
Other comprehensive income (loss):
Foreign currency translation adjustments	9,193	(3,743)
Reclassification of foreign currency translation adjustment due to deconsolidation of Ascenty	21,687	0
(Decrease) increase in fair value of interest rate swaps and foreign currency hedges	(3,775)	8,616
Reclassification to interest expense from interest rate swaps	(2,094)	(235)
Comprehensive income	146,008	114,733
Comprehensive income attributable to noncontrolling interests	115	12
Comprehensive income attributable to Digital Realty Trust, Inc./Digital Realty Trust, L.P.	$ 146,123	$ 114,745

CONDENSED CONSOLIDATED STATEM_2

CONDENSED CONSOLIDATED STATEMENTS OF EQUITY (unaudited) - USD ($) $ in Thousands	Total	Interest Rate Swap	Redeemable Noncontrolling Interests -- Operating Partnership	Preferred Stock	Common Stock	Additional Paid-in Capital	Accumulated Dividends in Excess of Earnings	Accumulated Other Comprehensive Loss, Net	Accumulated Other Comprehensive Loss, NetInterest Rate Swap	Total Stockholders’ Equity	Total Stockholders’ EquityInterest Rate Swap	Noncontrolling Interests in Operating Partnership	Noncontrolling Interests in Operating PartnershipInterest Rate Swap	Noncontrolling Interests in Consolidated Joint Ventures	Total Noncontrolling Interests	Total Noncontrolling InterestsInterest Rate Swap
Beginning balance at Dec. 31, 2017	$ 11,049,450		$ 53,902	$ 1,249,560	$ 2,044	$ 11,261,461	$ (2,055,552)	$ (108,432)		$ 10,349,081		$ 698,126		$ 2,243	$ 700,369
Beginning balance (shares) at Dec. 31, 2017					205,470,300
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of common units to common stock					$ 2	15,199				15,201		(15,201)			(15,201)
Conversion of common units to common stock (shares)					168,367
Issuance of unvested restricted stock, net of forfeitures (shares)					251,187
Issuance of common stock, net of offering costs	(12)					(12)				(12)
Shares issued under employee stock purchase plan	2,509					2,509				2,509
Shares issued under employee stock purchase plan (shares)					31,893
Shares repurchased and retired to satisfy tax withholding upon vesting	(4,718)				$ (1)	(4,717)				(4,718)
Shares repurchased and retired to satisfy tax withholding upon vesting (shares)					(46,833)
Amortization of share-based compensation	7,515					7,515				7,515
Reclassification of vested share-based awards						(2,497)				(2,497)		2,497			2,497
Adjustment to redeemable noncontrolling interests—operating partnership	4,031		(4,031)			4,031				4,031
Dividends declared on preferred stock	(20,329)						(20,329)			(20,329)
Dividends and distributions on common stock and common and incentive units	(216,697)		0				(208,015)			(208,015)		(8,682)			(8,682)
Contributions from noncontrolling interests in consolidated joint ventures, net of distributions	62													62	62
Net income	110,095		0				106,627			106,627		3,480		(12)	3,468
Other comprehensive loss—foreign currency translation adjustments	(3,743)							(3,598)		(3,598)		(145)			(145)
Other comprehensive income—fair value of interest rate swaps	8,616	$ 8,616							$ 8,282		$ 8,282		$ 334			$ 334
Other comprehensive loss—reclassification of accumulated other comprehensive income to interest expense	(235)							(226)		(226)		(9)			(9)
Ending balance at Mar. 31, 2018	10,936,544		49,871	1,249,560	$ 2,045	11,283,489	(2,177,269)	(103,974)		10,253,851		680,400		2,293	682,693
Ending balance (shares) at Mar. 31, 2018					205,874,914
Beginning balance at Dec. 31, 2018	10,858,210		15,832	1,249,560	$ 2,051	11,355,751	(2,633,071)	(115,647)		9,858,644		906,510		93,056	999,566
Beginning balance (shares) at Dec. 31, 2018					206,425,656
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Conversion of common units to common stock					$ 15	135,994				136,009		(136,009)			(136,009)
Conversion of common units to common stock (shares)					1,517,876
Issuance of unvested restricted stock, net of forfeitures (shares)					245,373
Issuance of common stock, net of offering costs	(375)					(375)				(375)
Shares issued under employee stock purchase plan	2,259					2,259				2,259
Shares issued under employee stock purchase plan (shares)					25,234
Issuance of series K preferred stock, net of offering costs	203,423			203,423						203,423
Amortization of share-based compensation	8,400					8,400				8,400
Reclassification of vested share-based awards						(7,320)				(7,320)		7,320			7,320
Adjustment to redeemable noncontrolling interests—operating partnership	(1,943)		1,943			(1,943)				(1,943)
Dividends declared on preferred stock	(20,329)						(20,329)			(20,329)
Dividends and distributions on common stock and common and incentive units	(234,983)		(169)				(224,802)			(224,802)		(10,181)			(10,181)
Contributions from noncontrolling interests in consolidated joint ventures, net of distributions	28,219													28,219	28,219
Net income	120,925		72				116,812			116,812		4,228		(115)	4,113
Other comprehensive loss—foreign currency translation adjustments	30,880							29,567		29,567		1,313			1,313
Other comprehensive income—fair value of interest rate swaps	(3,775)	$ (3,775)							$ (3,614)		$ (3,614)		$ (161)			$ (161)
Other comprehensive loss—reclassification of accumulated other comprehensive income to interest expense	(2,094)							(2,005)		(2,005)		(89)			(89)
Ending balance at Mar. 31, 2019	$ 10,982,499		$ 17,678	$ 1,452,983	$ 2,066	$ 11,492,766	$ (2,767,708)	$ (91,699)		$ 10,088,408		$ 772,931		$ 121,160	$ 894,091
Ending balance (shares) at Mar. 31, 2019					208,214,139

CONDENSED CONSOLIDATED STATEM_3

CONDENSED CONSOLIDATED STATEMENT OF CAPITAL (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance (units)	206,425,656
Conversion of limited partner common units to general partner common units	$ 136,009	$ 15,201
Units issued in connection with employee stock purchase plan	2,259	2,509
Units repurchased and retired to satisfy tax withholding upon vesting		(4,718)
Issuance of series K preferred units, net of offering costs	203,423
Amortization of share-based compensation	8,400	7,515
Cumulative effect adjustment from adoption of new accounting standard			$ (6,318)
Net income	120,925	110,095
Other comprehensive loss—foreign currency translation adjustments	30,880	(3,743)
Other comprehensive income—fair value of interest rate swaps	(3,775)	8,616
Other comprehensive loss—reclassification of accumulated other comprehensive income to interest expense	$ (2,094)	(235)
Ending balance (units)	208,214,139
Digital Realty Trust, L.P.
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	$ 10,858,210	11,049,450
Issuance of common units, net of offering costs	(375)	(12)
Units issued in connection with employee stock purchase plan	2,259	2,509
Units repurchased and retired to satisfy tax withholding upon vesting		(4,718)
Issuance of series K preferred units, net of offering costs	203,423
Amortization of share-based compensation	8,400	7,515
Adjustment to redeemable partnership units	(1,943)	4,031
Distributions	(255,312)	(237,026)
Contributions from noncontrolling interests in consolidated joint ventures, net of distributions	28,219	62
Cumulative effect adjustment from adoption of new accounting standard			(6,318)
Net income	120,925	110,095
Other comprehensive loss—foreign currency translation adjustments	30,880	(3,743)
Other comprehensive income—fair value of interest rate swaps	(3,775)	8,616
Other comprehensive loss—reclassification of accumulated other comprehensive income to interest expense	(2,094)	(235)
Ending balance	10,982,499	10,936,544
Redeemable Limited Partner Common Units | Digital Realty Trust, L.P.
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	15,832	53,902
Adjustment to redeemable partnership units	1,943	(4,031)
Distributions	(169)	0
Net income	72	0
Ending balance	17,678	49,871
Accumulated Other Comprehensive Loss | Digital Realty Trust, L.P.
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	(120,393)	(112,885)
Other comprehensive loss—foreign currency translation adjustments	30,880	(3,743)
Other comprehensive loss—reclassification of accumulated other comprehensive income to interest expense	(2,094)	(235)
Ending balance	(95,382)	(108,247)
Noncontrolling Interests in Consolidated Joint Ventures | Digital Realty Trust, L.P.
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	93,056	2,243
Contributions from noncontrolling interests in consolidated joint ventures, net of distributions	28,219	62
Net income	(115)	(12)
Ending balance	121,160	2,293
General Partner | Preferred Units | Digital Realty Trust, L.P.
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	$ 1,249,560	$ 1,249,560
Beginning balance (units)	50,650,000	50,650,000
Issuance of series K preferred units, net of offering costs (in shares)	8,400,000
Issuance of series K preferred units, net of offering costs	$ 203,423
Distributions	(20,329)	$ (20,329)
Net income	20,329	20,329
Ending balance	$ 1,452,983	$ 1,249,560
Ending balance (units)	59,050,000	50,650,000
General Partner | Common Units | Digital Realty Trust, L.P.
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	$ 8,724,731	$ 9,207,953
Beginning balance (units)	206,425,656	205,470,300
Conversion of limited partner common units to general partner common units	$ 136,009	$ 15,201
Conversion of limited partner common units to general partner common units (units)	1,517,876	168,367
Issuance of unvested restricted common units (units)	245,373	251,187
Issuance of common units, net of offering costs	$ (375)	$ (12)
Units issued in connection with employee stock purchase plan	$ 2,259	2,509
Units repurchased and retired to satisfy tax withholding upon vesting		$ (4,718)
Units repurchased and retired to satisfy tax withholding upon vesting (units)		(46,833)
Units issued in connection with employee stock purchase plan (units)	25,234	31,893
Amortization of share-based compensation	$ 8,400	$ 7,515
Reclassification of vested share-based awards	(7,320)	(2,497)
Adjustment to redeemable partnership units	(1,943)	4,031
Distributions	(224,802)	(208,015)
Cumulative effect adjustment from adoption of new accounting standard			$ (6,318)
Net income	96,483	86,298
Ending balance	$ 8,727,124	$ 9,108,265
Ending balance (units)	208,214,139	205,874,914
Limited Partners | Common Units | Digital Realty Trust, L.P.
Increase (Decrease) in Partners' Capital [Roll Forward]
Beginning balance	$ 911,256	$ 702,579
Beginning balance (units)	10,580,884	8,489,095
Conversion of limited partner common units to general partner common units	$ (136,009)	$ (15,201)
Conversion of limited partner common units to general partner common units (units)	(1,517,876)	(168,367)
Issuance of common units, net of forfeitures (units)	410,451	415,760
Reclassification of vested share-based awards	$ 7,320	$ 2,497
Adjustment to redeemable partnership units	0	0
Distributions	(10,181)	(8,682)
Net income	4,228	3,480
Ending balance	$ 776,614	$ 684,673
Ending balance (units)	9,473,459	8,736,488
Interest Rate Swap
Increase (Decrease) in Partners' Capital [Roll Forward]
Other comprehensive income—fair value of interest rate swaps	$ (3,775)	$ 8,616
Interest Rate Swap | Digital Realty Trust, L.P.
Increase (Decrease) in Partners' Capital [Roll Forward]
Other comprehensive income—fair value of interest rate swaps	(3,775)	8,616
Interest Rate Swap | Accumulated Other Comprehensive Loss | Digital Realty Trust, L.P.
Increase (Decrease) in Partners' Capital [Roll Forward]
Other comprehensive income—fair value of interest rate swaps	$ (3,775)	$ 8,616

CONDENSED CONSOLIDATED STATEM_4

CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash flows from operating activities:
Net income	$ 120,997	$ 110,095
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on deconsolidation / sale of properties, net	(67,497)	(39,273)
Unrealized gain on equity investment	(2,405)	0
Impairment of investments in real estate	5,351	0
Equity in earnings of unconsolidated joint ventures	(9,217)	(7,410)
Distributions from unconsolidated joint ventures	5,667	5,270
Write-off due to early lease terminations	4,922	431
Depreciation and amortization of buildings and improvements, tenant improvements and acquired ground leases	207,552	186,431
Amortization of acquired in-place lease value and deferred leasing costs	103,934	108,358
Amortization of share-based compensation	7,592	5,872
Non-cash amortization of terminated swaps	262	301
Allowance for (recovery of) doubtful accounts	6,093	(494)
Amortization of deferred financing costs	4,493	3,060
Loss on early extinguishment of debt	1,808	0
Amortization of debt discount/premium	737	851
Amortization of acquired above-market leases and acquired below-market leases, net	6,210	6,660
Changes in assets and liabilities:
Accounts and other receivables	(50,256)	(30,250)
Deferred rent	(13,426)	(10,454)
Deferred leasing costs	(8,032)	(4,613)
Other assets	(35,123)	(1,750)
Accounts payable and other accrued liabilities	49,576	(83,206)
Security deposits and prepaid rents	11,462	(12,889)
Net cash provided by operating activities	350,700	236,990
Cash flows from investing activities:
Improvements to investments in real estate	(389,266)	(289,840)
Acquisitions of real estate	(9,083)	0
Proceeds from sale of properties, net of sales costs	0	137,175
Proceeds from the Ascenty joint venture transaction	702,439	0
Deconsolidation of Ascenty cash	(97,081)	0
Contributions to unconsolidated joint ventures	(25,049)	(81)
Prepaid construction costs and other investments	(8,040)	(26,602)
Improvement advances to tenants	(24,878)	(11,627)
Collection of improvement advances to tenants	16,649	13,691
Net cash provided by (used in) investing activities	165,691	(177,284)
Cash flows from financing activities:
Borrowings on global revolving credit facility	1,346,495	579,685
Repayments on global revolving credit facility	(2,144,075)	(183,467)
Repayments on unsecured term loans	(375,000)	0
Borrowings on unsecured senior notes	1,427,159	0
Repayments on unsecured senior notes	(500,000)	0
Principal payments on mortgage loans	(156)	(192)
Payment of loan fees and costs	(7,793)	(294)
Premium paid for early extinguishment of debt	(11,078)	0
Capital contributions from noncontrolling interests in consolidated joint ventures, net	28,219	62
Taxes paid related to net settlement of stock-based compensation awards	0	(4,718)
Proceeds from common and preferred stock offerings, net	203,048	(12)
Proceeds from equity plans	2,259	2,509
Payment of dividends/distributions to preferred stockholders/unitholders	(20,329)	(20,329)
Payment of dividends/distributions to common stockholders/unitholders and distributions to noncontrolling interests in operating partnership	(452,393)	(416,458)
Net cash used in financing activities	(503,644)	(43,214)
Net increase in cash, cash equivalents and restricted cash	12,747	16,492
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(13,960)	27
Cash, cash equivalents and restricted cash at beginning of period	135,222	13,181
Cash, cash equivalents and restricted cash at end of period	134,009	29,700
Supplemental disclosure of cash flow information:
Cash paid for interest, net of amounts capitalized	104,073	78,728
Cash paid for income taxes	3,253	4,272
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	27,910
Supplementary disclosure of noncash operating activities:
Right-of-use assets obtained in exchange for new operating lease liabilities	689,917
Supplementary disclosure of noncash investing and financing activities:
Change in net assets related to foreign currency translation adjustments	30,880	(3,743)
(Decrease) increase in other assets related to change in fair value of interest rate swaps	(3,775)	8,616
Decrease to goodwill and deferred tax liability (classified within accounts payable and other accrued liabilities)	(9,436)	0
Noncontrolling interests in operating partnership converted to shares of common stock	136,009	15,201
Accrual for additions to investments in real estate and tenant improvement advances included in accounts payable and accrued expenses	196,462	177,812
Addition to leasehold improvements pursuant to capital lease obligation	0	73,873
Deconsolidation of Ascenty:
Investment in unconsolidated joint ventures	930,326
Investment in real estate	(15,542,054)
Account receivables	(328,009)
Acquired in-place lease value, deferred leasing costs and intangibles	(2,580,624)
Goodwill	(3,358,463)
Other assets	(162,768)
Secured debt	105,493
Accounts payable and other accrued liabilities	922,571
Accumulated other comprehensive loss, net	(91,699)
Deconsolidation of Ascenty cash	(97,081)	0
Digital Realty Trust, L.P.
Cash flows from operating activities:
Net income	120,997	110,095
Adjustments to reconcile net income to net cash provided by operating activities:
Gain on deconsolidation / sale of properties, net	(67,497)	(39,273)
Unrealized gain on equity investment	(2,405)	0
Impairment of investments in real estate	5,351	0
Equity in earnings of unconsolidated joint ventures	(9,217)	(7,410)
Distributions from unconsolidated joint ventures	5,667	5,270
Write-off due to early lease terminations	4,922	431
Depreciation and amortization of buildings and improvements, tenant improvements and acquired ground leases	207,552	186,431
Amortization of acquired in-place lease value and deferred leasing costs	103,934	108,358
Amortization of share-based compensation	7,592	5,872
Non-cash amortization of terminated swaps	262	301
Allowance for (recovery of) doubtful accounts	6,093	(494)
Amortization of deferred financing costs	4,493	3,060
Loss on early extinguishment of debt	1,808	0
Amortization of debt discount/premium	737	851
Amortization of acquired above-market leases and acquired below-market leases, net	6,210	6,660
Changes in assets and liabilities:
Accounts and other receivables	(50,256)	(30,250)
Deferred rent	(13,426)	(10,454)
Deferred leasing costs	(8,032)	(4,613)
Other assets	(35,123)	(1,750)
Accounts payable and other accrued liabilities	49,576	(83,206)
Security deposits and prepaid rents	11,462	(12,889)
Net cash provided by operating activities	350,700	236,990
Cash flows from investing activities:
Improvements to investments in real estate	(389,266)	(289,840)
Acquisitions of real estate	(9,083)	0
Proceeds from sale of properties, net of sales costs	0	137,175
Proceeds from the Ascenty joint venture transaction	702,439	0
Deconsolidation of Ascenty cash	(97,081)	0
Contributions to unconsolidated joint ventures	(25,049)	(81)
Prepaid construction costs and other investments	(8,040)	(26,602)
Improvement advances to tenants	(24,878)	(11,627)
Collection of improvement advances to tenants	16,649	13,691
Net cash provided by (used in) investing activities	165,691	(177,284)
Cash flows from financing activities:
Borrowings on global revolving credit facility	1,346,495	579,685
Repayments on global revolving credit facility	(2,144,075)	(183,467)
Repayments on unsecured term loans	(375,000)	0
Borrowings on unsecured senior notes	1,427,159	0
Repayments on unsecured senior notes	(500,000)	0
Principal payments on mortgage loans	(156)	(192)
Payment of loan fees and costs	(7,793)	(294)
Premium paid for early extinguishment of debt	(11,078)	0
Capital contributions from noncontrolling interests in consolidated joint ventures, net	28,219	62
Taxes paid related to net settlement of stock-based compensation awards	0	(4,718)
General partner contributions, net	205,307	2,497
Payment of dividends/distributions to preferred stockholders/unitholders	(20,329)	(20,329)
Payment of dividends/distributions to common stockholders/unitholders and distributions to noncontrolling interests in operating partnership	(452,393)	(416,458)
Net cash used in financing activities	(503,644)	(43,214)
Net increase in cash, cash equivalents and restricted cash	12,747	16,492
Effect of exchange rate changes on cash, cash equivalents and restricted cash	(13,960)	27
Cash, cash equivalents and restricted cash at beginning of period	135,222	13,181
Cash, cash equivalents and restricted cash at end of period	134,009	29,700
Supplemental disclosure of cash flow information:
Cash paid for interest, net of amounts capitalized	104,073	78,728
Cash paid for income taxes	3,253	4,272
Cash paid for amounts included in the measurement of lease liabilities:
Operating cash flows from operating leases	27,910	0
Supplementary disclosure of noncash operating activities:
Right-of-use assets obtained in exchange for new operating lease liabilities	689,917	0
Supplementary disclosure of noncash investing and financing activities:
Change in net assets related to foreign currency translation adjustments	30,880	(3,743)
(Decrease) increase in other assets related to change in fair value of interest rate swaps	(3,775)	8,616
Decrease to goodwill and deferred tax liability (classified within accounts payable and other accrued liabilities)	(9,436)	0
Accrual for additions to investments in real estate and tenant improvement advances included in accounts payable and accrued expenses	196,462	177,812
Addition to leasehold improvements pursuant to capital lease obligation	0	73,873
Deconsolidation of Ascenty:
Investment in unconsolidated joint ventures	930,326
Investment in real estate	(15,542,054)
Account receivables	(328,009)
Acquired in-place lease value, deferred leasing costs and intangibles	(2,580,624)
Goodwill	(3,358,463)
Other assets	(162,768)
Secured debt	105,493
Accounts payable and other accrued liabilities	922,571
Accumulated other comprehensive loss, net	(95,382)
Deconsolidation of Ascenty cash	(97,081)	$ 0
Ascenty Acquisition
Cash flows from investing activities:
Deconsolidation of Ascenty cash	(97,081)
Deconsolidation of Ascenty:
Investment in real estate	(362,951)
Account receivables	(24,977)
Acquired in-place lease value, deferred leasing costs and intangibles	(480,128)
Goodwill	(967,189)
Other assets	(31,099)
Secured debt	571,873
Accounts payable and other accrued liabilities	72,449
Accumulated other comprehensive loss, net	(21,687)
Deconsolidation of Ascenty cash	(97,081)
Net carrying value of Ascenty assets and liabilities deconsolidated	(1,340,790)
Ascenty Acquisition | Digital Realty Trust, L.P.
Cash flows from investing activities:
Deconsolidation of Ascenty cash	(97,081)
Deconsolidation of Ascenty:
Investment in unconsolidated joint ventures	0
Investment in real estate	(362,951)
Account receivables	(24,977)
Acquired in-place lease value, deferred leasing costs and intangibles	(480,128)
Goodwill	(967,189)
Other assets	(31,099)
Secured debt	571,873
Accounts payable and other accrued liabilities	72,449
Accumulated other comprehensive loss, net	(21,687)
Deconsolidation of Ascenty cash	(97,081)
Net carrying value of Ascenty assets and liabilities deconsolidated	$ (1,340,790)

Organization and Description of

Organization and Description of Business	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Organization and Description of Business	Organization and Description of Business Digital Realty Trust, Inc. through its controlling interest in Digital Realty Trust, L.P. (the Operating Partnership) and the subsidiaries of the Operating Partnership (collectively, we, our, us or the Company) is a leading global provider of data center, colocation and interconnection solutions for customers across a variety of industry verticals ranging from cloud and information technology services, communications and social networking to financial services, manufacturing, energy, healthcare, and consumer products. The Operating Partnership, a Maryland limited partnership, is the entity through which Digital Realty Trust, Inc., a Maryland corporation, conducts its business of owning, acquiring, developing and operating data centers. Digital Realty Trust, Inc. operates as a REIT for federal income tax purposes. A summary of our data center portfolio as of March 31, 2019 and December 31, 2018 is as follows: Data Centers As of March 31, 2019 As of December 31, 2018 Region Operating Unconsolidated Joint Ventures Total Operating Unconsolidated Joint Ventures Total United States 131 14 145 131 14 145 Europe 38 — 38 38 — 38 Latin America — 17 17 16 — 16 Asia 3 4 7 3 4 7 Australia 5 — 5 5 — 5 Canada 3 — 3 3 — 3 Total 180 35 215 196 18 214 On December 20, 2018, the Operating Partnership and Stellar Participações Ltda., a Brazilian subsidiary of the Operating Partnership, completed the acquisition of Ascenty, a leading data center provider in Brazil, for cash and equity consideration of approximately $2.0 billion , including cash purchased. We refer to this transaction as the Ascenty Acquisition. In March 2019, we formed a joint venture with Brookfield Infrastructure, an affiliate of Brookfield Asset Management, one of the largest owners and operators of infrastructure assets globally. Brookfield invested approximately $700 million in exchange for approximately 49% of the total equity interests in the joint venture which owns and operates Ascenty. A subsidiary of the Operating Partnership retained the remaining equity interest in the Ascenty joint venture. The power to control the Ascenty joint venture is shared equally between the Operating Partnership and Brookfield and as a result of losing control, the Operating Partnership deconsolidated Ascenty on March 29, 2019. See note 5 for additional information. We are diversified in major metropolitan areas where data center and technology customers are concentrated, including the Atlanta, Boston, Chicago, Dallas, Los Angeles, New York, Northern Virginia, Phoenix, San Francisco, Seattle, Silicon Valley and Toronto metropolitan areas in North America, the Amsterdam, Dublin, Frankfurt, London and Paris metropolitan areas in Europe, the Fortaleza, Rio de Janeiro and São Paulo metropolitan areas in Latin America, and the Hong Kong, Melbourne, Osaka, Singapore, Sydney, and Tokyo metropolitan areas in the Asia Pacific region. The portfolio consists of data centers, Internet gateway facilities and office and other non-data center space. The Operating Partnership was formed on July 21, 2004 in anticipation of Digital Realty Trust, Inc.’s initial public offering (IPO) on November 3, 2004 and commenced operations on that date. As of March 31, 2019 , Digital Realty Trust, Inc. owned a 95.6% common interest and a 100.0% preferred interest in the Operating Partnership. As of December 31, 2018 , Digital Realty Trust, Inc. owned a 95.1% common interest and a 100.0% preferred interest in the Operating Partnership. As sole general partner of the Operating Partnership, Digital Realty Trust, Inc. has the full, exclusive and complete responsibility for the Operating Partnership’s day-to-day management and control. The limited partners of the Operating Partnership do not have rights to replace Digital Realty Trust, Inc. as the general partner nor do they have participating rights, although they do have certain protective rights. As used in these Notes: “DFT” refers to DuPont Fabros Technology, Inc.; “DFT Merger” refers to the Company’s acquisition of DuPont Fabros Technology, Inc.; “DFT Operating Partnership” refers to DuPont Fabros Technology, L.P.; “European Portfolio Acquisition” refers to the Company’s acquisition of a portfolio of eight data centers in Europe; and “Telx Acquisition” refers to the Company’s acquisition of Telx Holdings, Inc.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	Summary of Significant Accounting Policies (a) Principles of Consolidation and Basis of Presentation The accompanying interim condensed consolidated financial statements include all of the accounts of Digital Realty Trust, Inc., the Operating Partnership and their subsidiaries. Intercompany balances and transactions have been eliminated. The accompanying interim condensed consolidated financial statements are unaudited, but have been prepared in accordance with U.S. generally accepted accounting principles (U.S. GAAP) for interim financial information and in compliance with the rules and regulations of the U.S. Securities and Exchange Commission. Accordingly, they do not include all of the disclosures required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments necessary for a fair presentation have been included. All such adjustments are considered to be of a normal recurring nature, except as otherwise indicated. The results of operations for the interim periods are not necessarily indicative of the results to be obtained for the full fiscal year. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our annual report on Form 10-K for the year ended December 31, 2018 . The notes to the condensed consolidated financial statements of Digital Realty Trust, Inc. and the Operating Partnership have been combined to provide the following benefits: • enhancing investors’ understanding of the Company and the Operating Partnership by enabling investors to view the business as a whole in the same manner as management views and operates the business; • eliminating duplicative disclosure and providing a more streamlined and readable presentation since a substantial portion of the disclosure applies to both the Company and the Operating Partnership; and • creating time and cost efficiencies through the preparation of one set of notes instead of two separate sets of notes. There are few differences between the Company and the Operating Partnership, which are reflected in these condensed consolidated financial statements. We believe it is important to understand the differences between the Company and the Operating Partnership in the context of how we operate as an interrelated consolidated company. Digital Realty Trust, Inc.’s only material asset is its ownership of partnership interests of the Operating Partnership. As a result, Digital Realty Trust, Inc. generally does not conduct business itself, other than acting as the sole general partner of the Operating Partnership, issuing public securities from time to time and guaranteeing certain unsecured debt of the Operating Partnership and certain of its subsidiaries and affiliates. Digital Realty Trust, Inc. itself has not issued any indebtedness but guarantees the unsecured debt of the Operating Partnership and certain of its subsidiaries and affiliates, as disclosed in these notes. The Operating Partnership holds substantially all the assets of the Company and holds the ownership interests in the Company’s joint ventures. The Operating Partnership conducts the operations of the business and is structured as a partnership with no publicly traded equity. Except for net proceeds from public equity issuances by Digital Realty Trust, Inc., which are generally contributed to the Operating Partnership in exchange for partnership units, the Operating Partnership generally generates the capital required by the Company’s business primarily through the Operating Partnership’s operations, by the Operating Partnership’s or its affiliates’ direct or indirect incurrence of indebtedness or through the issuance of partnership units. The presentation of noncontrolling interests in operating partnership, stockholders’ equity and partners’ capital are the main areas of difference between the condensed consolidated financial statements of Digital Realty Trust, Inc. and those of the Operating Partnership. The common limited partnership interests held by the limited partners in the Operating Partnership are presented as limited partners’ capital within partners’ capital in the Operating Partnership’s condensed consolidated financial statements and as noncontrolling interests in operating partnership within equity in Digital Realty Trust, Inc.’s condensed consolidated financial statements. The common and preferred partnership interests held by Digital Realty Trust, Inc. in the Operating Partnership are presented as general partner’s capital within partners’ capital in the Operating Partnership’s condensed consolidated financial statements and as preferred stock, common stock, additional paid-in capital and accumulated dividends in excess of earnings within stockholders’ equity in Digital Realty Trust, Inc.’s condensed consolidated financial statements. The differences in the presentations between stockholders’ equity and partners’ capital result from the differences in the equity issued at the Digital Realty Trust, Inc. and the Operating Partnership levels. To help investors understand the significant differences between the Company and the Operating Partnership, these consolidated financial statements present the following separate sections for each of the Company and the Operating Partnership: • condensed consolidated face financial statements; and • the following notes to the condensed consolidated financial statements: • "Debt of the Company" and "Debt of the Operating Partnership"; • "Income per Share" and "Income per Unit"; and • "Equity and Accumulated Other Comprehensive Loss, Net of the Company" and "Capital and Accumulated Other Comprehensive Loss of the Operating Partnership". In the sections that combine disclosure of Digital Realty Trust, Inc. and the Operating Partnership, these notes refer to actions or holdings as being actions or holdings of the Company. Although the Operating Partnership is generally the entity that enters into contracts and joint ventures and holds assets and debt, reference to the Company is appropriate because the business is one enterprise and the Company generally operates the business through the Operating Partnership. (b) Cash Equivalents For the purpose of the condensed consolidated statements of cash flows, we consider short-term investments with original maturities of 90 days or less to be cash equivalents. As of March 31, 2019 , cash equivalents consist of investments in money market instruments. (c) Investments in Unconsolidated Joint Ventures The Company’s investments in unconsolidated joint ventures are accounted for using the equity method, whereby our investment is increased for capital contributed and our share of the joint venture's net income and decreased by distributions we receive and our share of any losses of the joint ventures. We do not record losses of the joint ventures in excess of our investment balances unless we are liable for the obligations of the joint venture or are otherwise committed to provide financial support to the joint venture. Likewise, and as long as we have no explicit or implicit obligations to the joint venture, we will suspend equity method accounting to the extent that cash distributions exceed our investment balances until those unrecorded earnings exceed the excess distributions previously recognized in income. In this case, we will apply cost accounting concepts which tie income recognition to the receipt of cash. Cost basis accounting concepts will apply until earnings exceed the excess distributions previously recognized in income. We amortize the difference between the cost of our investments in the joint ventures and the book value of the underlying equity into income on a straight-line basis consistent with the lives of the underlying assets. The amortization of this difference was immaterial for the three months ended March 31, 2019 and 2018 , respectively. (d) Impairment of Long-Lived and Finite-Lived Intangible Assets We review each of our properties for indicators that its carrying amount may not be recoverable. Examples of such indicators may include a significant decrease in the market price of the property, a change in the expected holding period for the property, a significant adverse change in how the property is being used or expected to be used based on the underwriting at the time of acquisition, an accumulation of costs significantly in excess of the amount originally expected for the acquisition or development of the property, or a history of operating or cash flow losses of the property. When such impairment indicators exist, we review an estimate of the future undiscounted net cash flows (excluding interest charges) expected to result from the real estate investment’s use and eventual disposition and compare that estimate to the carrying value of the property. We consider factors such as future operating income, trends and prospects, as well as the effects of leasing demand, competition and other factors. If our future undiscounted net cash flow evaluation indicates that we are unable to recover the carrying value of a real estate investment, an impairment loss is recorded to the extent that the carrying value exceeds the estimated fair value of the property. These losses have a direct impact on our net income because recording an impairment loss results in an immediate negative adjustment to net income. The evaluation of anticipated cash flows is highly subjective and is based in part on assumptions regarding future occupancy, rental rates and capital requirements that could differ materially from actual results in future periods. Since cash flows on properties considered to be long-lived assets to be held and used are considered on an undiscounted basis to determine whether the carrying value of a property is recoverable, our strategy of holding properties over the long-term directly decreases the likelihood of their carrying values not being recoverable and therefore requiring the recording of an impairment loss. If our strategy changes or market conditions otherwise dictate an earlier sale date, an impairment loss may be recognized and such loss could be material. If we determine that the asset fails the recoverability test, the affected assets must be reduced to their fair value. We generally estimate the fair value of rental properties utilizing a discounted cash flow analysis that includes projections of future revenues, expenses and capital improvement costs that a market participant would use based on the highest and best use of the asset, which is similar to the income approach that is commonly utilized by appraisers. In certain cases, we may supplement this analysis by obtaining outside broker opinions of value. In considering whether to classify a property as held for sale, the Company considers whether: (i) management has committed to a plan to sell the property; (ii) the property is available for immediate sale in its present condition; (iii) the Company has initiated a program to locate a buyer; (iv) the Company believes that the sale of the property is probable; (v) the Company is actively marketing the property for sale at a price that is reasonable in relation to its current value; and (vi) actions required for the Company to complete the plan indicate that it is unlikely that any significant changes will be made to the plan. If all the above criteria are met, the Company classifies the property as held for sale. Upon being classified as held for sale, the Company ceases all depreciation and amortization related to the property and it is recorded at the lower of its carrying amount or fair value less cost to sell. The assets and related liabilities of the property are classified separately on the condensed consolidated balance sheets for the most recent reporting period. Only those assets held for sale that constitute a strategic shift that has or will have a major effect on our operations are classified as discontinued operations. To date we have had no property dispositions or assets classified as held for sale that would meet the definition of discontinued operations. If impairment indicators arise with respect to intangible assets with finite useful lives, we evaluate impairment by comparing the carrying amount of the asset to the estimated future undiscounted net cash flows expected to be generated by the asset. If estimated future undiscounted net cash flows are less than the carrying amount of the asset, then we estimate the fair value of the asset and compare the estimated fair value to the intangible asset’s carrying value. We recognize any shortfall from carrying value as an impairment loss in the current period. (e) Capitalization of Costs Direct and indirect project costs that are clearly associated with the development of properties are capitalized as incurred. Project costs include all costs directly associated with the development of a property, including construction costs, interest, property taxes, insurance, legal fees and costs of personnel working on the project. Indirect costs that do not clearly relate to the projects under development are not capitalized and are charged to expense as incurred. Capitalization of costs begins when the activities necessary to get the development project ready for its intended use begins, which include costs incurred before the beginning of construction. Capitalization of costs ceases when the development project is substantially complete and ready for its intended use. Determining when a development project commences and when it is substantially complete and ready for its intended use involves a degree of judgment. We generally consider a development project to be substantially complete and ready for its intended use upon receipt of a certificate of occupancy. If and when development of a property is suspended pursuant to a formal change in the planned use of the property, we will evaluate whether the accumulated costs exceed the estimated value of the project and write off the amount of any such excess accumulated costs. For a development project that is suspended for reasons other than a formal change in the planned use of such property, the accumulated project costs are evaluated for impairment consistent with our impairment policies for long-lived assets. During the development period, all costs including the associated land are classified to construction in progress and space held for development. Upon completion of the development period for a project, accumulated construction in progress costs including the land related to a project are allocated to the specific components of a project that are benefited. Construction in progress and space held for development includes the cost of land, the cost of construction of buildings, improvements and fixed equipment, and costs for design and engineering. Other costs, such as interest, legal, property taxes and corporate project supervision, which can be directly associated with the project during construction, are also included in construction in progress and space held for development. Land held for development includes parcels of land owned by the Company, upon which the Company intends to develop and own data centers, but has yet to commence development. We have reclassified certain items in the December 31, 2018 condensed consolidated balance sheet to conform to the current presentation as follows (in thousands): December 31, 2018 As Previously Reported Adjustments As Revised Land $ 1,509,764 $ (650,651 ) $ 859,113 Building and improvements 16,745,210 (1,134,218 ) 15,610,992 Construction in progress and space held for development — 1,621,928 1,621,928 Land held for future development — 162,941 162,941 During the three months ended March 31, 2019 and 2018 , we capitalized interest of approximately $10.9 million and $7.4 million , respectively. We capitalized amounts relating to compensation and other overhead expense of employees direct and incremental to construction activities of approximately $10.7 million and $10.1 million during the three months ended March 31, 2019 and 2018 , respectively. (f) Goodwill Goodwill represents the excess of the purchase price over the fair value of net tangible and intangible assets acquired and tangible and intangible liabilities assumed in a business combination. Goodwill is not amortized. We perform an annual impairment test for goodwill and between annual tests, we evaluate goodwill for impairment whenever events or changes in circumstances occur that would more likely than not reduce the fair value of a reporting unit below its carrying value. In our impairment tests of goodwill, we first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying value. If based on this assessment, we determine that the fair value of the reporting unit is not less than its carrying value, then performing the additional two-step impairment test is unnecessary. If our qualitative assessment indicates that goodwill impairment is more likely than not, we perform a two-step impairment test. We test goodwill for impairment under the two-step impairment test by first comparing the book value of net assets including goodwill to the fair value of the reporting unit. If the fair value is determined to be less than the book value of the net assets, including goodwill, a second step is performed to compute the amount of impairment as the difference between the implied fair value of goodwill and its carrying value. We estimate the fair value of the reporting unit using discounted cash flows. If the carrying value of goodwill exceeds its implied fair value, an impairment charge is recognized. We have not recognized any goodwill impairments since our inception. Since some of the goodwill is denominated in foreign currencies, changes to the goodwill balance occur over time due to changes in foreign exchange rates. The following is a summary of goodwill activity for the three months ended March 31, 2019 (in thousands): Balance as of December 31, 2018 Deconsolidation Goodwill Adjustments (1) Impact of Change in Foreign Exchange Rates Balance as of March 31, 2019 Merger / Portfolio Acquisition Telx Acquisition $ 330,845 $ — $ — $ — $ 330,845 European Portfolio Acquisition 442,349 — (9,436 ) 2,559 435,472 DFT Merger 2,592,146 — — — 2,592,146 Ascenty Acquisition 982,667 (982,667 ) — — — Total $ 4,348,007 $ (982,667 ) $ (9,436 ) $ 2,559 $ 3,358,463 (1) As a result of a subsequent change to an acquired deferred tax liability that would not have impacted consideration paid, goodwill was adjusted. (g) Leases We lease real estate, including corporate and regional offices, data center, and land, along with IT equipment. When we receive substantially all economic benefits from and direct use of specified property, plant and equipment, we account for those transactions as leases under ASU No. 2016-02 Leases (Topic 842). See note 2(t) for further discussion regarding the adoption of Topic 842 on January 1, 2019. We have elected the practical expedient within Topic 842 to not separate lease and non-lease components within lease transactions for all asset classes within our existing lease portfolio and, therefore, account for non-lease components combined with related lease components under Topic 842. For transactions involving leases of buildings and land, we have also elected to not separate land components from leases of specified property, plant, and equipment, as it was determined to have no effect on lease classification for any lease component, and the amounts recognized for land lease components would not have been material. Additionally, we have elected the short-term lease exception for all classes of assets, and do not apply the recognition and measurement requirements for leases of 12 months or less, and recognize lease payments for short-term leases as expense either straight-line over the lease term or as incurred depending on whether the lease payments are fixed or variable. These elections are applied consistently for all leases. When discount rates implicit in leases cannot be readily determined, we use the applicable incremental borrowing rate at lease commencement to perform lease classification tests on lease components and to measure lease liabilities and right-of-use assets. We assigned a collateralized interest rate to each lease based on the term and the currency in which each lease is denominated. To the extent there are leases in foreign countries, rates were adjusted based on local yields in those particular markets. Further, we apply the “bright-line” thresholds within Topic 840 for lease classification for all classes of assets. (h) Share-Based Compensation The Company measures all share-based compensation awards at fair value on the date they are granted to employees and directors, and recognizes compensation cost, net of forfeitures, over the requisite service period for awards with only a service condition. The estimated fair value of the long-term incentive units and Class D units (discussed in Note 14) granted by us is being amortized on a straight-line basis over the expected service period. The fair value of share-based compensation awards that contain a market condition is measured using a Monte Carlo simulation method and not adjusted based on actual achievement of the market condition. (i) Assets and Liabilities Measured at Fair Value Fair value under U.S. GAAP is a market-based measurement, not an entity-specific measurement. Therefore, our fair value measurements are determined based on the assumptions that market participants would use in pricing the asset or liability. As a basis for considering market participant assumptions in fair-value measurements, we use a fair-value hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity (observable inputs that are classified within Levels 1 and 2 of the hierarchy) and the reporting entity’s own assumptions about market participant assumptions (unobservable inputs classified within Level 3 of the hierarchy). Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access. Level 2 inputs are inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. Level 2 inputs may include quoted prices for similar assets and liabilities in active markets, as well as inputs that are observable for the asset or liability (other than quoted prices), such as interest rates, foreign exchange rates, and yield curves that are observable at commonly quoted intervals. Level 3 inputs are unobservable inputs for the asset or (j) Derivative Instruments Derivative financial instruments are employed to manage risks, including foreign currency and interest rate exposures and are not used for trading or speculative purposes. As part of the Company’s risk management program, a variety of financial instruments, such as interest rate swaps and foreign exchange contracts, may be used to mitigate interest rate exposure and foreign currency exposure. The Company recognizes all derivative instruments in the balance sheet at fair value. Changes in the fair value of derivatives are recognized periodically either in earnings or in stockholders’ equity as a component of accumulated other comprehensive income (loss), depending on whether the derivative financial instrument is undesignated or qualifies for hedge accounting, and if so, whether it represents a fair value, cash flow, or net investment hedge. Gains and losses on derivatives designated as cash flow hedges, to the extent they are included in the assessment of effectiveness, are recorded in other comprehensive income (loss) and subsequently reclassified to earnings to offset the impact of the hedged items when they occur. In the event it becomes probable the forecasted transaction to which a cash flow hedge relates will not occur, the derivative would be terminated and the amount in other comprehensive income (loss) would be recognized in earnings. Changes in the fair value of derivatives that are designated and qualify as a hedge of the net investment in foreign operations, to the extent they are included in the assessment of effectiveness, are reported in other comprehensive income (loss) and are deferred until disposal of the underlying assets. Gains and losses representing components excluded from the assessment of effectiveness for cash flow and fair value hedges are recognized in earnings on a straight-line basis in the same caption as the hedged item over the term of the hedge. Gains and losses representing components excluded from the assessment of effectiveness for net investment hedges are recognized in earnings on a straight-line basis over the term of the hedge. The net interest paid or received on interest rate swaps is recognized as interest expense. Gains and losses resulting from the early termination of interest rate swap agreements are deferred and amortized as adjustments to interest expense over the remaining period of the debt originally covered by the terminated swap. See Note 15 for further discussion on derivative instruments. (k) Income Taxes Digital Realty Trust, Inc. has elected to be treated as a real estate investment trust (a “REIT”) for federal income tax purposes. As a REIT, Digital Realty Trust, Inc. generally is not required to pay federal corporate income tax to the extent taxable income is currently distributed to its stockholders. If Digital Realty Trust, Inc. fails to qualify as a REIT in any taxable year, it will be subject to federal income tax (including any applicable alternative minimum tax for taxable years prior to 2018) on its taxable income. The Company is subject to foreign, state and local income taxes in the jurisdictions in which it conducts business. The Company’s taxable REIT subsidiaries are subject to federal, state and foreign income taxes to the extent there is taxable income. Accordingly, the Company recognizes current and deferred income taxes for its taxable REIT subsidiaries, including federal, state and non-U.S. jurisdictions, as appropriate. We assess our significant tax positions in accordance with U.S. GAAP for all open tax years and determine whether we have any material unrecognized liabilities from uncertain tax benefits. If a tax position is not considered “more-likely-than-not” to be sustained solely on its technical merits, no benefits of the tax position are to be recognized (for financial statement purposes). As of March 31, 2019 and December 31, 2018 , we had no assets or liabilities for uncertain tax positions. We classify interest and penalties from significant uncertain tax positions as interest expense and operating expense, respectively, in our condensed consolidated income statements. For the three months ended March 31, 2019 and 2018 , we had no such interest or penalties. The tax year 2015 and thereafter remain open to examination by the major taxing jurisdictions with which the Company files tax returns. See Note 11 for further discussion on income taxes. (l) Presentation of Transactional-based Taxes We account for transactional-based taxes, such as value added tax, or VAT, for our international properties on a net basis. (m) Redeemable Noncontrolling Interests Redeemable noncontrolling interests include amounts related to partnership units issued by consolidated subsidiaries of the Company in which redemption for equity is outside the control of the Company. Partnership units which are determined to be contingently redeemable for cash under the Financial Accounting Standards Board’s "Distinguishing Liabilities from Equity" guidance are classified as redeemable noncontrolling interests and presented in the mezzanine section between total liabilities and stockholder’s equity on the Company’s condensed consolidated balance sheets. The amounts of consolidated net income attributable to the Company and to the noncontrolling interests are presented on the Company’s condensed consolidated income statements. (n) Revenue Recognition The majority of our revenue is derived from lease arrangements, which we account for in accordance with Topic 842 commencing on January 1, 2019 and “Leases (Topic 840)” prior to 2019. We account for the non-lease components within our lease arrangements, as well as other sources of revenue, in accordance with “Revenue from Contracts with Customers (Topic 606)”. Revenue recognized as a result of applying Topic 842 and 840 was 99% and 97% and Topic 606 was less than 1% and 3% of total operating revenue for the three months ended March 31, 2019 and 2018, respectively. Our leases are classified as operating leases and minimum rents are recognized on a straight-line basis over the terms of the leases, which may span multiple years. The excess of rents recognized over amounts contractually due pursuant to the underlying leases is included in deferred rent in the accompanying condensed consolidated balance sheets and contractually due but unpaid rents are included in accounts and other receivables. Tenant reimbursements for real estate taxes, common area maintenance, and other recoverable costs under our leases are recognized in the period that the expenses are incurred. Lease termination fees are recognized over the remaining term of the lease, effective as of the date the lease modification is finalized, assuming collection is not considered doubtful. As discussed above, we recognize amortization of the value of acquired above or below-market tenant leases as a reduction of rental revenue in the case of above-market leases or an increase to rental revenue in the case of below-market leases. Interconnection services are included in rental and other services on the condensed consolidated income statements and are generally provided on a month-to-month, one-year or multi-year term. Interconnection services include port and cross-connect services. Port services are typically sold on a one-year or multi-year term and revenue is recognized on a recurring monthly basis (straight-line). The Company bills customers on a monthly basis and recognizes the revenue over the period the service is provided. Revenue for cross-connect installations is generally recognized in the period the cross-connect is installed. Interconnection services that are not specific to a particular space are accounted for under Topic 606 and have terms that are generally one year or less. Occasionally, customers engage the Company for certain services. The nature of these services historically involves property management and construction management. The proper revenue recognition of these services can be different, depending on whether the arrangements are service revenue or contractor type revenue. Service revenues are typically recognized on an equal monthly basis based on the minimum fee to be earned. The monthly amounts could be adjusted depending on if certain performance milestones are met. Fee income arises primarily from contractual management agreements with entities in which we have a noncontrolling interest. The management fees are recognized as earned under the respective agreements. Management and other fee income related to partially owned noncontrolled entities are recognized to the extent attributable to the unaffiliated interest. We make subjective estimates as to when our revenue is earned and the collectability of our accounts receivable related to minimum rent, deferred rent, expense reimbursements, lease termination fees and other income. We specifically analyze accounts receivable and historical bad debts, customer concentrations, customer creditworthiness and current economic trends when evaluating the adequacy of the allowance for bad debts. These estimates have a direct impact on our net revenue because a higher bad debt allowance would result in lower net revenue, and recognizing rental revenue as earned in one period versus another would result in higher or lower net revenue for a particular period. (o) Transaction and Integration Expense Transaction and integration expense includes business combination expenses, other business development expenses and other expenses to integrate newly acquired investments, which are expensed as incurred. Transaction expenses include closing costs, broker commissions and other professional fees, including legal and accounting fees related to business combinations or acquisitions that were not consumma

Real Estate

Real Estate	3 Months Ended
	Mar. 31, 2019
Real Estate [Abstract]
Real Estate	Real Estate Acquisitions We acquired the following real estate during the three months ended March 31, 2019 : Location Market Date Acquired Amount (in millions) Dulles World Park (1) Northern Virginia Feb 25, 2019 $ 9.0 (1) Represents currently vacant land which is not included in our operating property count. Purchase price excludes capitalized closing costs.

Investments in Unconsolidated J

Investments in Unconsolidated Joint Ventures	3 Months Ended
	Mar. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]
Investments in Unconsolidated Joint Ventures	Investments in Unconsolidated Joint Ventures As of March 31, 2019 and December 31, 2018 , our investments in unconsolidated joint ventures accounted for under the equity method of accounting presented in our condensed consolidated balance sheets consist of the following (in thousands): Joint Venture Metropolitan Area % Ownership March 31, 2019 December 31, 2018 Ascenty (1) Brazil / Chile 51% (2) $ 743,083 $ — Chun Choi Hong Kong 50% 96,988 96,094 Digital MC Osaka / Tokyo 50% 77,845 66,835 Other 12,410 12,179 Total $ 930,326 $ 175,108 (1) Our maximum exposure to loss related to this unconsolidated variable interest entity (VIE) is limited to our equity investment in this VIE. (2) Includes an approximate 2% ownership interest by a non-controlling interest in our entity that holds the investment in the Ascenty joint venture, which has a carrying value of approximately $25.0 million . The debt of our unconsolidated joint ventures generally are non-recourse to us, except for customary exceptions pertaining to such matters as intentional misuse of funds, environmental conditions, and material misrepresentations. Ascenty Joint Venture We completed the acquisition of Ascenty on December 20, 2018 for total cash and equity consideration of approximately $2.0 billion , including approximately $116.0 million of assumed cash and cash equivalents. The transaction was initially funded with $600.0 million of proceeds from a non-recourse, five -year secured term loan; the issuance of approximately $254 million of Operating Partnership common units in exchange for the substantial majority of the Ascenty management's equity interests; and approximately $1.0 billion of unsecured corporate borrowings. On March 29, 2019, we formed a joint venture with Brookfield Infrastructure, an affiliate of Brookfield Asset Management. Brookfield invested approximately $700 million in exchange for approximately 49% of the total equity interests and a subsidiary of the Operating Partnership retained the remaining 51% equity interests in the joint venture which owns and operates Ascenty. The governing documents related to the Ascenty joint venture provide Brookfield and the Company shared power to direct the activities of the Ascenty joint venture that most significantly impact the Ascenty joint venture's economic performance. As a result of the formation of the joint venture, the Company determined that the joint venture is a variable interest entity (VIE) since the Ascenty joint venture's equity investment at risk is not sufficient to finance the Ascenty joint venture's ongoing data center development activities without additional subordinated financial support. The Company concluded that it is not the primary beneficiary because power is shared and it does not have substantive kick-out rights to obtain control and deconsolidated Ascenty. We recognized a gain of approximately $67.5 million (net of the accumulated foreign currency translation loss related to Ascenty) on the deconsolidation and subsequent recognition of our subsidiary's 51% equity investment in the Ascenty joint venture at its estimated fair value of $727 million on March 29, 2019. The fair value of the Company’s retained equity investment is based on Level 2 measurements within the fair value hierarchy based on the cash price paid by Brookfield for their 49% interest. The gain was calculated based on the: (i) the sum of the cash proceeds of $702 million received from Brookfield for its 49% interest and the estimated fair value of $727 million for our 51% retained interest less (ii) the carrying value of the Ascenty assets and liabilities deconsolidated as of March 29, 2019. The gain related to the remeasurement of the Company's retained equity interests to fair value was approximately $89.2 million . The reported gain of $67.5 million was net of a foreign currency translation loss of approximately $21.7 million previously included in accumulated other comprehensive loss, net, which accumulated during the period the Company consolidated Ascenty and translated the Ascenty into the Company's functional currency. The Company has no other subsidiaries or businesses with the Brazilian Real as its functional currency and therefore, the deconsolidation of Ascenty resulted in the reclassification out of accumulated other comprehensive loss into a component of income from continuing operations in the condensed consolidated income statement. The Ascenty deconsolidation did not meet the criteria to be presented as a discontinued operation in accordance with ASC 205-20, Presentation of Financial Statements Discontinued Operations, because the deconsolidation of Ascenty does not represent a strategic shift in nor has a major effect on the Company's operations, as defined by ASC 205-20.

Leases

Leases	3 Months Ended
	Mar. 31, 2019
Leases [Abstract]
Leases	Leases We lease space at certain of our data centers from third parties, primarily data centers acquired as part of the Telx Acquisition and European Portfolio Acquisition, and certain equipment under noncancelable lease agreements. Leases for our data centers expire at various dates through 2034. As of March 31, 2019, certain of our data centers, primarily in Europe, are subject to ground leases. The termination dates of these ground leases range from 2024 to 2982. In addition, our corporate headquarters along with several regional office locations are subject to leases with termination dates ranging from 2019 to 2027. The leases may contain renewal and/or early termination options that are not reasonably certain of exercise as of March 31, 2019 . Also, the leases generally require us to make fixed rental payments that increase at defined intervals during the term of the lease plus pay our share of common area, real estate and utility expenses as incurred. The leases neither contain residual value guarantees nor impose material restrictions or covenants on us. Further, the leases have been classified and accounted for as either operating or finance leases. Supplemental balance sheet information related to leases as of March 31, 2019 was as follows (in thousands): Balance Sheet Classification Balance as of March 31, 2019 Assets: Operating lease assets Operating lease right-of-use assets $ 660,586 Finance lease assets Buildings and improvements 124,371 Total leased assets $ 784,957 Liabilities: Operating lease liabilities Operating lease liabilities $ 725,470 Finance lease liabilities Accounts payable and other accrued liabilities 167,764 Total lease liabilities $ 893,234 The components of lease expense for the three months ended March 31, 2019 were as follows (in thousands): Lease cost Income Statement Classification Three Months Ended March 31, 2019 Finance lease cost: Amortization of right-of-use assets Depreciation and amortization $ 1,227 Interest on lease liabilities Interest expense 1,646 Operating lease cost Rental property operating and maintenance 23,114 Total lease cost $ 25,987 As of March 31, 2019, the weighted average remaining lease term for our operating leases and finance leases was 13 years and 25 years , respectively. We do not include renewal options in the lease term for calculating the lease liability unless we are reasonably certain we will exercise the option or the lessor has the sole ability to exercise the option. The weighted average incremental borrowing rate was 4.1% for operating leases and 3.9% for finance leases at March 31, 2019 . We assigned a collateralized interest rate to each lease based on the term of the lease and the currency in which the lease is denominated. The minimum commitment under operating leases, excluding fully prepaid ground leases, as of December 31, 2018 was as follows (in thousands): 2019 $ 84,712 2020 87,396 2021 86,212 2022 81,976 2023 80,707 Thereafter 539,047 Total $ 960,050 Future minimum lease payments and their present value for property under capital lease obligations as of December 31, 2018, are as follows (in thousands): 2019 $ 11,657 2020 13,108 2021 13,207 2022 13,706 2023 14,219 Thereafter 285,774 351,671 Less amount representing interest (137,827 ) Present value $ 213,844 Maturities of lease liabilities as of March 31, 2019 were as follows (in thousands): Operating lease liabilities Finance lease liabilities Remainder of 2019 $ 62,313 $ 5,351 2020 84,415 8,823 2021 83,181 8,868 2022 79,187 9,332 2023 78,382 9,788 Thereafter 548,011 234,658 Total undiscounted future cash flows 935,489 276,820 Less: Imputed interest (210,019 ) (109,056 ) Present value of undiscounted future cash flows $ 725,470 $ 167,764 Lessor accounting We recognized revenue from our lease agreements aggregating $3.0 billion for the year ended December 31, 2018. This revenue consisted primarily of rental revenues and tenant recoveries for the year ended December 31, 2018, aggregating $2.1 billion and $0.6 billion , respectively. Prior to January 1, 2019, we recognized rental revenue from our operating leases on a straight-line basis over the respective lease terms. We commenced recognition of rental revenue at the date the property was ready for its intended use and the tenant took possession of, or controlled the physical use of, the property. Prior to January 1, 2019, we considered tenant recoveries related to payments of real estate taxes, insurance, utilities, repairs and maintenance, common area expenses, and other operating expenses as lease components. We recognized these tenant recoveries as revenue when services were rendered in an amount equal to the related operating expenses incurred that were recoverable under the terms of the applicable lease and classified as tenant reimbursements revenue. Effective January 1, 2019 Under the new lease ASUs, each lease agreement is evaluated to identify the lease and nonlease components at lease inception. The total consideration in the lease agreement is allocated to the lease and nonlease components based on their relative stand-alone selling prices. The new lease ASUs govern the recognition of revenue for lease components, and revenue related to nonlease components is subject to the revenue recognition ASU. Tenant recoveries for utilities, repairs and maintenance, and common area expenses are considered nonlease components. If a lessee makes payments for taxes and insurance directly to a third party on behalf of a lessor, lessors are required to exclude them from variable payments and from recognition in the lessors’ income statements. Otherwise, tenant recoveries for taxes and insurance are classified as additional lease revenue recognized by the lessor on a gross basis in their income statements. On January 1, 2019, we adopted the practical expedient that allowed us to not separate expenses reimbursed by our customers (“rental recoveries”) from the associated rental revenue if certain criteria were met. We assessed these criteria and concluded that the timing and pattern of transfer for rental revenue and the associated rental recoveries are the same and as our leases qualify as operating leases, we accounted for and presented rental revenue and rental recoveries as a single component under rental and other services in our condensed consolidated income statements for the three months ended March 31, 2019. Costs to execute leases The new lease ASUs require that lessors and lessees capitalize, as initial direct costs, only incremental costs of a lease that would not have been incurred if the lease had not been obtained. Effective January 1, 2019, costs that we incur to negotiate or arrange a lease regardless of its outcome, such as fixed employee compensation, tax, or legal advice to negotiate lease terms, and costs related to advertising or soliciting potential tenants will be expensed as incurred. We estimate that approximately $37 million of initial direct costs that were capitalized in 2018 would have been expensed if the new lease ASUs that are effective on January 1, 2019 had been in effect during 2018. Future expenses as a result of the change in the accounting for initial direct costs will depend on the future events that are not yet known; therefore, the ultimate impact on initial direct leasing costs from the adoption of the lease ASUs might differ from our estimate. Under the package of practical expedients that we elected on January 1, 2019, we were not required to reassess whether initial direct leasing costs capitalized prior to the adoption of the new lease ASUs in connection with the leases that commenced prior to January 1, 2019, qualify for capitalization under the new lease ASUs. Therefore, we continue to amortize these initial direct leasing costs. We lease our operating properties to customers under agreements that are classified as operating leases. We recognize the total minimum lease payments provided for under the leases on a straight-line basis over the lease term if we determine that it is probable that substantially all of the lease payments will be collected over the lease term. Otherwise, rental revenue is recognized based on the amount contractually due. Generally, under the terms of our leases, the majority of our rental expenses, including common area maintenance, real estate taxes and insurance, are recovered from our customers. We record amounts reimbursed by customers in the period that the applicable expenses are incurred, which is generally ratably throughout the term of the lease. The reimbursements are recognized in rental and other services revenue in the condensed consolidated income statements as we are the primary obligor with respect to purchasing and selecting goods and services from third-party vendors and bearing the associated credit risk. The following table summarizes the minimum lease payments due from our customers on leases with lease periods greater than one year for space in our operating properties, prestabilized development properties and leases of land subject to ground leases at March 31, 2019 (in thousands): Operating leases Remainder of 2019 $ 1,761,276 2020 1,949,524 2021 1,714,577 2022 1,411,271 2023 1,211,576 Thereafter 4,400,329 Total $ 12,448,553 These amounts do not reflect future rental revenues from the renewal or replacement of existing leases unless we are reasonably certain we will exercise the option or the lessor has the sole ability to exercise the option. We exclude reimbursements of operating expenses and rental increases that are not fixed.
Leases	Leases We lease space at certain of our data centers from third parties, primarily data centers acquired as part of the Telx Acquisition and European Portfolio Acquisition, and certain equipment under noncancelable lease agreements. Leases for our data centers expire at various dates through 2034. As of March 31, 2019, certain of our data centers, primarily in Europe, are subject to ground leases. The termination dates of these ground leases range from 2024 to 2982. In addition, our corporate headquarters along with several regional office locations are subject to leases with termination dates ranging from 2019 to 2027. The leases may contain renewal and/or early termination options that are not reasonably certain of exercise as of March 31, 2019 . Also, the leases generally require us to make fixed rental payments that increase at defined intervals during the term of the lease plus pay our share of common area, real estate and utility expenses as incurred. The leases neither contain residual value guarantees nor impose material restrictions or covenants on us. Further, the leases have been classified and accounted for as either operating or finance leases. Supplemental balance sheet information related to leases as of March 31, 2019 was as follows (in thousands): Balance Sheet Classification Balance as of March 31, 2019 Assets: Operating lease assets Operating lease right-of-use assets $ 660,586 Finance lease assets Buildings and improvements 124,371 Total leased assets $ 784,957 Liabilities: Operating lease liabilities Operating lease liabilities $ 725,470 Finance lease liabilities Accounts payable and other accrued liabilities 167,764 Total lease liabilities $ 893,234 The components of lease expense for the three months ended March 31, 2019 were as follows (in thousands): Lease cost Income Statement Classification Three Months Ended March 31, 2019 Finance lease cost: Amortization of right-of-use assets Depreciation and amortization $ 1,227 Interest on lease liabilities Interest expense 1,646 Operating lease cost Rental property operating and maintenance 23,114 Total lease cost $ 25,987 As of March 31, 2019, the weighted average remaining lease term for our operating leases and finance leases was 13 years and 25 years , respectively. We do not include renewal options in the lease term for calculating the lease liability unless we are reasonably certain we will exercise the option or the lessor has the sole ability to exercise the option. The weighted average incremental borrowing rate was 4.1% for operating leases and 3.9% for finance leases at March 31, 2019 . We assigned a collateralized interest rate to each lease based on the term of the lease and the currency in which the lease is denominated. The minimum commitment under operating leases, excluding fully prepaid ground leases, as of December 31, 2018 was as follows (in thousands): 2019 $ 84,712 2020 87,396 2021 86,212 2022 81,976 2023 80,707 Thereafter 539,047 Total $ 960,050 Future minimum lease payments and their present value for property under capital lease obligations as of December 31, 2018, are as follows (in thousands): 2019 $ 11,657 2020 13,108 2021 13,207 2022 13,706 2023 14,219 Thereafter 285,774 351,671 Less amount representing interest (137,827 ) Present value $ 213,844 Maturities of lease liabilities as of March 31, 2019 were as follows (in thousands): Operating lease liabilities Finance lease liabilities Remainder of 2019 $ 62,313 $ 5,351 2020 84,415 8,823 2021 83,181 8,868 2022 79,187 9,332 2023 78,382 9,788 Thereafter 548,011 234,658 Total undiscounted future cash flows 935,489 276,820 Less: Imputed interest (210,019 ) (109,056 ) Present value of undiscounted future cash flows $ 725,470 $ 167,764 Lessor accounting We recognized revenue from our lease agreements aggregating $3.0 billion for the year ended December 31, 2018. This revenue consisted primarily of rental revenues and tenant recoveries for the year ended December 31, 2018, aggregating $2.1 billion and $0.6 billion , respectively. Prior to January 1, 2019, we recognized rental revenue from our operating leases on a straight-line basis over the respective lease terms. We commenced recognition of rental revenue at the date the property was ready for its intended use and the tenant took possession of, or controlled the physical use of, the property. Prior to January 1, 2019, we considered tenant recoveries related to payments of real estate taxes, insurance, utilities, repairs and maintenance, common area expenses, and other operating expenses as lease components. We recognized these tenant recoveries as revenue when services were rendered in an amount equal to the related operating expenses incurred that were recoverable under the terms of the applicable lease and classified as tenant reimbursements revenue. Effective January 1, 2019 Under the new lease ASUs, each lease agreement is evaluated to identify the lease and nonlease components at lease inception. The total consideration in the lease agreement is allocated to the lease and nonlease components based on their relative stand-alone selling prices. The new lease ASUs govern the recognition of revenue for lease components, and revenue related to nonlease components is subject to the revenue recognition ASU. Tenant recoveries for utilities, repairs and maintenance, and common area expenses are considered nonlease components. If a lessee makes payments for taxes and insurance directly to a third party on behalf of a lessor, lessors are required to exclude them from variable payments and from recognition in the lessors’ income statements. Otherwise, tenant recoveries for taxes and insurance are classified as additional lease revenue recognized by the lessor on a gross basis in their income statements. On January 1, 2019, we adopted the practical expedient that allowed us to not separate expenses reimbursed by our customers (“rental recoveries”) from the associated rental revenue if certain criteria were met. We assessed these criteria and concluded that the timing and pattern of transfer for rental revenue and the associated rental recoveries are the same and as our leases qualify as operating leases, we accounted for and presented rental revenue and rental recoveries as a single component under rental and other services in our condensed consolidated income statements for the three months ended March 31, 2019. Costs to execute leases The new lease ASUs require that lessors and lessees capitalize, as initial direct costs, only incremental costs of a lease that would not have been incurred if the lease had not been obtained. Effective January 1, 2019, costs that we incur to negotiate or arrange a lease regardless of its outcome, such as fixed employee compensation, tax, or legal advice to negotiate lease terms, and costs related to advertising or soliciting potential tenants will be expensed as incurred. We estimate that approximately $37 million of initial direct costs that were capitalized in 2018 would have been expensed if the new lease ASUs that are effective on January 1, 2019 had been in effect during 2018. Future expenses as a result of the change in the accounting for initial direct costs will depend on the future events that are not yet known; therefore, the ultimate impact on initial direct leasing costs from the adoption of the lease ASUs might differ from our estimate. Under the package of practical expedients that we elected on January 1, 2019, we were not required to reassess whether initial direct leasing costs capitalized prior to the adoption of the new lease ASUs in connection with the leases that commenced prior to January 1, 2019, qualify for capitalization under the new lease ASUs. Therefore, we continue to amortize these initial direct leasing costs. We lease our operating properties to customers under agreements that are classified as operating leases. We recognize the total minimum lease payments provided for under the leases on a straight-line basis over the lease term if we determine that it is probable that substantially all of the lease payments will be collected over the lease term. Otherwise, rental revenue is recognized based on the amount contractually due. Generally, under the terms of our leases, the majority of our rental expenses, including common area maintenance, real estate taxes and insurance, are recovered from our customers. We record amounts reimbursed by customers in the period that the applicable expenses are incurred, which is generally ratably throughout the term of the lease. The reimbursements are recognized in rental and other services revenue in the condensed consolidated income statements as we are the primary obligor with respect to purchasing and selecting goods and services from third-party vendors and bearing the associated credit risk. The following table summarizes the minimum lease payments due from our customers on leases with lease periods greater than one year for space in our operating properties, prestabilized development properties and leases of land subject to ground leases at March 31, 2019 (in thousands): Operating leases Remainder of 2019 $ 1,761,276 2020 1,949,524 2021 1,714,577 2022 1,411,271 2023 1,211,576 Thereafter 4,400,329 Total $ 12,448,553 These amounts do not reflect future rental revenues from the renewal or replacement of existing leases unless we are reasonably certain we will exercise the option or the lessor has the sole ability to exercise the option. We exclude reimbursements of operating expenses and rental increases that are not fixed.
Leases	Leases We lease space at certain of our data centers from third parties, primarily data centers acquired as part of the Telx Acquisition and European Portfolio Acquisition, and certain equipment under noncancelable lease agreements. Leases for our data centers expire at various dates through 2034. As of March 31, 2019, certain of our data centers, primarily in Europe, are subject to ground leases. The termination dates of these ground leases range from 2024 to 2982. In addition, our corporate headquarters along with several regional office locations are subject to leases with termination dates ranging from 2019 to 2027. The leases may contain renewal and/or early termination options that are not reasonably certain of exercise as of March 31, 2019 . Also, the leases generally require us to make fixed rental payments that increase at defined intervals during the term of the lease plus pay our share of common area, real estate and utility expenses as incurred. The leases neither contain residual value guarantees nor impose material restrictions or covenants on us. Further, the leases have been classified and accounted for as either operating or finance leases. Supplemental balance sheet information related to leases as of March 31, 2019 was as follows (in thousands): Balance Sheet Classification Balance as of March 31, 2019 Assets: Operating lease assets Operating lease right-of-use assets $ 660,586 Finance lease assets Buildings and improvements 124,371 Total leased assets $ 784,957 Liabilities: Operating lease liabilities Operating lease liabilities $ 725,470 Finance lease liabilities Accounts payable and other accrued liabilities 167,764 Total lease liabilities $ 893,234 The components of lease expense for the three months ended March 31, 2019 were as follows (in thousands): Lease cost Income Statement Classification Three Months Ended March 31, 2019 Finance lease cost: Amortization of right-of-use assets Depreciation and amortization $ 1,227 Interest on lease liabilities Interest expense 1,646 Operating lease cost Rental property operating and maintenance 23,114 Total lease cost $ 25,987 As of March 31, 2019, the weighted average remaining lease term for our operating leases and finance leases was 13 years and 25 years , respectively. We do not include renewal options in the lease term for calculating the lease liability unless we are reasonably certain we will exercise the option or the lessor has the sole ability to exercise the option. The weighted average incremental borrowing rate was 4.1% for operating leases and 3.9% for finance leases at March 31, 2019 . We assigned a collateralized interest rate to each lease based on the term of the lease and the currency in which the lease is denominated. The minimum commitment under operating leases, excluding fully prepaid ground leases, as of December 31, 2018 was as follows (in thousands): 2019 $ 84,712 2020 87,396 2021 86,212 2022 81,976 2023 80,707 Thereafter 539,047 Total $ 960,050 Future minimum lease payments and their present value for property under capital lease obligations as of December 31, 2018, are as follows (in thousands): 2019 $ 11,657 2020 13,108 2021 13,207 2022 13,706 2023 14,219 Thereafter 285,774 351,671 Less amount representing interest (137,827 ) Present value $ 213,844 Maturities of lease liabilities as of March 31, 2019 were as follows (in thousands): Operating lease liabilities Finance lease liabilities Remainder of 2019 $ 62,313 $ 5,351 2020 84,415 8,823 2021 83,181 8,868 2022 79,187 9,332 2023 78,382 9,788 Thereafter 548,011 234,658 Total undiscounted future cash flows 935,489 276,820 Less: Imputed interest (210,019 ) (109,056 ) Present value of undiscounted future cash flows $ 725,470 $ 167,764 Lessor accounting We recognized revenue from our lease agreements aggregating $3.0 billion for the year ended December 31, 2018. This revenue consisted primarily of rental revenues and tenant recoveries for the year ended December 31, 2018, aggregating $2.1 billion and $0.6 billion , respectively. Prior to January 1, 2019, we recognized rental revenue from our operating leases on a straight-line basis over the respective lease terms. We commenced recognition of rental revenue at the date the property was ready for its intended use and the tenant took possession of, or controlled the physical use of, the property. Prior to January 1, 2019, we considered tenant recoveries related to payments of real estate taxes, insurance, utilities, repairs and maintenance, common area expenses, and other operating expenses as lease components. We recognized these tenant recoveries as revenue when services were rendered in an amount equal to the related operating expenses incurred that were recoverable under the terms of the applicable lease and classified as tenant reimbursements revenue. Effective January 1, 2019 Under the new lease ASUs, each lease agreement is evaluated to identify the lease and nonlease components at lease inception. The total consideration in the lease agreement is allocated to the lease and nonlease components based on their relative stand-alone selling prices. The new lease ASUs govern the recognition of revenue for lease components, and revenue related to nonlease components is subject to the revenue recognition ASU. Tenant recoveries for utilities, repairs and maintenance, and common area expenses are considered nonlease components. If a lessee makes payments for taxes and insurance directly to a third party on behalf of a lessor, lessors are required to exclude them from variable payments and from recognition in the lessors’ income statements. Otherwise, tenant recoveries for taxes and insurance are classified as additional lease revenue recognized by the lessor on a gross basis in their income statements. On January 1, 2019, we adopted the practical expedient that allowed us to not separate expenses reimbursed by our customers (“rental recoveries”) from the associated rental revenue if certain criteria were met. We assessed these criteria and concluded that the timing and pattern of transfer for rental revenue and the associated rental recoveries are the same and as our leases qualify as operating leases, we accounted for and presented rental revenue and rental recoveries as a single component under rental and other services in our condensed consolidated income statements for the three months ended March 31, 2019. Costs to execute leases The new lease ASUs require that lessors and lessees capitalize, as initial direct costs, only incremental costs of a lease that would not have been incurred if the lease had not been obtained. Effective January 1, 2019, costs that we incur to negotiate or arrange a lease regardless of its outcome, such as fixed employee compensation, tax, or legal advice to negotiate lease terms, and costs related to advertising or soliciting potential tenants will be expensed as incurred. We estimate that approximately $37 million of initial direct costs that were capitalized in 2018 would have been expensed if the new lease ASUs that are effective on January 1, 2019 had been in effect during 2018. Future expenses as a result of the change in the accounting for initial direct costs will depend on the future events that are not yet known; therefore, the ultimate impact on initial direct leasing costs from the adoption of the lease ASUs might differ from our estimate. Under the package of practical expedients that we elected on January 1, 2019, we were not required to reassess whether initial direct leasing costs capitalized prior to the adoption of the new lease ASUs in connection with the leases that commenced prior to January 1, 2019, qualify for capitalization under the new lease ASUs. Therefore, we continue to amortize these initial direct leasing costs. We lease our operating properties to customers under agreements that are classified as operating leases. We recognize the total minimum lease payments provided for under the leases on a straight-line basis over the lease term if we determine that it is probable that substantially all of the lease payments will be collected over the lease term. Otherwise, rental revenue is recognized based on the amount contractually due. Generally, under the terms of our leases, the majority of our rental expenses, including common area maintenance, real estate taxes and insurance, are recovered from our customers. We record amounts reimbursed by customers in the period that the applicable expenses are incurred, which is generally ratably throughout the term of the lease. The reimbursements are recognized in rental and other services revenue in the condensed consolidated income statements as we are the primary obligor with respect to purchasing and selecting goods and services from third-party vendors and bearing the associated credit risk. The following table summarizes the minimum lease payments due from our customers on leases with lease periods greater than one year for space in our operating properties, prestabilized development properties and leases of land subject to ground leases at March 31, 2019 (in thousands): Operating leases Remainder of 2019 $ 1,761,276 2020 1,949,524 2021 1,714,577 2022 1,411,271 2023 1,211,576 Thereafter 4,400,329 Total $ 12,448,553 These amounts do not reflect future rental revenues from the renewal or replacement of existing leases unless we are reasonably certain we will exercise the option or the lessor has the sole ability to exercise the option. We exclude reimbursements of operating expenses and rental increases that are not fixed.

Acquired Intangible Assets and

Acquired Intangible Assets and Liabilities	3 Months Ended
	Mar. 31, 2019
Acquired Intangible Assets And Liabilities [Abstract]
Acquired Intangible Assets and Liabilities	Acquired Intangible Assets and Liabilities The following summarizes our acquired intangible assets (real estate intangibles, comprised of acquired in-place lease value and tenant relationship value along with acquired above-market lease value) and intangible liabilities (acquired below-market lease value) as of March 31, 2019 and December 31, 2018 . Balance as of (Amounts in thousands) March 31, 2019 December 31, 2018 Real Estate Intangibles: Acquired in-place lease value: Gross amount (1) $ 1,450,914 $ 1,569,401 Accumulated amortization (840,778 ) (795,033 ) Net $ 610,136 $ 774,368 Tenant relationship value: Gross amount (1) $ 1,966,006 $ 2,339,606 Accumulated amortization (322,791 ) (291,818 ) Net $ 1,643,215 $ 2,047,788 Acquired above-market leases: Gross amount $ 278,592 $ 277,796 Accumulated amortization (172,548 ) (158,037 ) Net $ 106,044 $ 119,759 Acquired below-market leases: Gross amount $ 442,936 $ 442,535 Accumulated amortization (250,269 ) (242,422 ) Net $ 192,667 $ 200,113 (1) In connection with the deconsolidation of Ascenty, $120.0 million of acquired in-place lease value and $375.0 million of tenant relationship value were written off during the three months ended March 31, 2019 . Amortization of acquired below-market leases, net of acquired above-market leases, resulted in a decrease in rental revenues of $6.2 million and $6.9 million for the three months ended March 31, 2019 and 2018 , respectively. The expected average remaining lives for acquired below-market leases and acquired above-market leases is 8.0 years and 2.7 years, respectively, as of March 31, 2019 . Estimated annual amortization of acquired below-market leases, net of acquired above-market leases, for each of the five succeeding years and thereafter, commencing April 1, 2019 is as follows: (Amounts in thousands) Remainder of 2019 $ (9,150 ) 2020 (3,912 ) 2021 889 2022 7,923 2023 12,070 Thereafter 78,803 Total $ 86,623 Amortization of acquired in-place lease value (a component of depreciation and amortization expense) was $44.9 million and $57.0 million for the three months ended March 31, 2019 and 2018 , respectively. The expected average amortization period for acquired in-place lease value is 5.9 years as of March 31, 2019 . The weighted average remaining contractual life for acquired leases excluding renewals or extensions is 5.5 years as of March 31, 2019 . Estimated annual amortization of acquired in-place lease value for each of the five succeeding years and thereafter, commencing April 1, 2019 is as follows: (Amounts in thousands) Remainder of 2019 $ 101,543 2020 111,585 2021 87,036 2022 65,153 2023 53,596 Thereafter 191,223 Total $ 610,136 Amortization of tenant relationship value (a component of depreciation and amortization expense) was approximately $38.0 million and $31.0 million for the three months ended March 31, 2019 and 2018 , respectively. As of March 31, 2019 , the weighted average remaining contractual life for tenant relationship value was 14.0 years. Estimated annual amortization of tenant relationship value for each of the five succeeding years and thereafter, commencing April 1, 2019 is as follows: (Amounts in thousands) Remainder of 2019 $ 92,301 2020 123,069 2021 123,069 2022 123,069 2023 123,069 Thereafter 1,058,638 Total $ 1,643,215

Debt of the Company

Debt of the Company	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Debt of the Company	Debt of the Company In this Note 7, the “Company” refers only to Digital Realty Trust, Inc. and not to any of its subsidiaries. The Company itself does not currently have any indebtedness. All debt is currently held directly or indirectly by the Operating Partnership. Guarantee of Debt The Company guarantees the Operating Partnership’s obligations with respect to its 3.400% notes due 2020 ( 3.400% 2020 Notes), 5.250% notes due 2021 ( 2021 Notes ), 3.950% notes due 2022 ( 3.950% 2022 Notes ), 3.625% notes due 2022 ( 3.625% 2022 Notes ), 2.750% notes due 2023 ( 2.750% 2023 Notes), 4.750% notes due 2025 ( 4.750% 2025 Notes), 3.700% notes due 2027 (2027 Notes) and 4.450% notes due 2028 (2028 Notes). The Company and the Operating Partnership guarantee the obligations of Digital Stout Holding, LLC, a wholly owned subsidiary of the Operating Partnership, with respect to its 4.750% notes due 2023 ( 4.750% 2023 Notes ), 2.750% notes due 2024 ( 2.750% 2024 Notes), 4.250% notes due 2025 ( 4.250% 2025 Notes ), 3.300% notes due 2029 (2029 Notes) and 3.750% notes due 2030 (2030 Notes) and the obligations of Digital Euro Finco, LLC, an indirect wholly owned subsidiary of the Operating Partnership, with respect to its 2.625% notes due 2024 ( 2.625% 2024 Notes), 2.500% notes due 2026 (2026 Notes) and Floating Rate Guaranteed Notes due 2019 (2019 Notes). The Company is also the guarantor of the Operating Partnership’s and its subsidiary borrowers’ obligations under the global revolving credit facility and unsecured term loans.

Debt of the Operating Partnersh

Debt of the Operating Partnership	3 Months Ended
	Mar. 31, 2019
Digital Realty Trust, L.P.
Debt Instrument [Line Items]
Debt of the Operating Partnership	Debt of the Operating Partnership A summary of outstanding indebtedness of the Operating Partnership as of March 31, 2019 and December 31, 2018 is as follows (in thousands): Indebtedness Interest Rate at March 31, 2019 Maturity Date Principal Outstanding at March 31, 2019 Principal Outstanding at December 31, 2018 Global revolving credit facilities Various (1)(4) Jan 24, 2023 (1) $ 857,211 (2) $ 1,663,156 (2) Deferred financing costs, net (14,236 ) (15,421 ) Global revolving credit facilities, net 842,975 1,647,735 Unsecured Term Loans 2019 Term Loan Base Rate + 1.000% Jan 19, 2019 — 375,000 2023 Term Loan Various (3)(4) Jan 15, 2023 300,000 (5) 300,000 (5) 2024 Term Loan Various (3)(4) Jan 24, 2023 (3) 511,654 (5) 508,120 (5) Deferred financing costs, net (3,928 ) (4,216 ) Unsecured term loans, net 807,726 1,178,904 Floating rate notes due 2019 EURIBOR + 0.500% May 22, 2019 140,225 (6) 143,338 (6) 5.875% notes due 2020 5.875% Feb 1, 2020 — (8) 500,000 3.400% notes due 2020 3.400% Oct 1, 2020 500,000 500,000 5.250% notes due 2021 5.250% Mar 15, 2021 400,000 400,000 3.950% notes due 2022 3.950% Jul 1, 2022 500,000 500,000 3.625% notes due 2022 3.625% Oct 1, 2022 300,000 300,000 2.750% notes due 2023 2.750% Feb 1, 2023 350,000 350,000 4.750% notes due 2023 4.750% Oct 13, 2023 391,050 (7) 382,620 (7) 2.625% notes due 2024 2.625% Apr 15, 2024 673,080 (6) 688,020 (6) 2.750% notes due 2024 2.750% Jul 19, 2024 325,875 (7) 318,850 (7) 4.250% notes due 2025 4.250% Jan 17, 2025 521,400 (7) 510,160 (7) 4.750% notes due 2025 4.750% Oct 1, 2025 450,000 450,000 2.500% notes due 2026 2.500% Jan 16, 2026 1,205,935 (6) — 3.700% notes due 2027 3.700% Aug 15, 2027 1,000,000 1,000,000 4.450% notes due 2028 4.450% Jul 15, 2028 650,000 650,000 3.300% notes due 2029 3.300% Jul 19, 2029 456,225 (7) 446,390 (7) 3.750% notes due 2030 3.750% Oct 17, 2030 $ 716,925 (7)(9) $ 510,160 (7) Unamortized discounts, net of premiums (11,520 ) (19,859 ) Total senior notes, net of discount 8,569,195 7,629,679 Deferred financing costs, net (45,733 ) (40,553 ) Total unsecured senior notes, net of discount and deferred financing costs 8,523,462 7,589,126 Indebtedness Interest Rate at March 31, 2019 Maturity Date Principal Outstanding March 31, 2019 Principal Outstanding December 31, 2018 Secured Debt: 731 East Trade Street 8.22% Jul 1, 2020 $ 1,621 $ 1,776 Secured note due March 2023 LIBOR + 1.100% (4) Mar 1, 2023 104,000 104,000 Secured note due December 2023 Base Rate + 4.250% Dec 20, 2023 — (10) 600,000 Unamortized net premiums 124 148 Total mortgage loans, including premiums 105,745 705,924 Deferred financing costs, net (252 ) (20,210 ) Total secured debt, including premiums and net of deferred financing costs 105,493 685,714 Total indebtedness $ 10,279,656 $ 11,101,479 _________________________________ (1) The interest rate for borrowings under the global revolving credit facility equals the applicable index plus a margin of 90 basis points, which is based on the current credit rating of our long-term debt. An annual facility fee of 20 basis points, which is based on the credit rating of our long-term debt, is due and payable quarterly on the total commitment amount of the facility. Two six -month extensions are available, which we may exercise if certain conditions are met. The interest rate for borrowings under the Yen revolving credit facility equals the applicable index plus a margin of 50 basis points, which is based on the current credit rating of our long-term debt. (2) Balances as of March 31, 2019 and December 31, 2018 are as follows (balances, in thousands): Denomination of Draw Balance as of March 31, 2019 Weighted-average interest rate Balance as of December 31, 2018 Weighted-average interest rate Floating Rate Borrowing (a)(d) U.S. dollar ($) $ 290,000 3.39 % $ 890,000 3.37 % British pound sterling (£) — — % 8,290 (c) 1.61 % Euro (€) 203,046 (b) 0.90 % 451,800 (c) 0.90 % Australian dollar (AUD) 31,648 (b) 2.74 % 27,632 (c) 2.82 % Hong Kong dollar (HKD) 10,051 (b) 2.43 % 8,797 (c) 3.14 % Japanese yen (JPY) 4,059 (b) 0.90 % 4,105 (c) 0.90 % Singapore dollar (SGD) 77,680 (b) 2.83 % 77,112 (c) 2.79 % Canadian dollar (CAD) 67,794 (b) 2.81 % 60,856 (c) 3.16 % Total $ 684,278 2.47 % $ 1,528,592 2.57 % Yen Revolving Credit Facility $ 172,933 (b) 0.50 % $ 134,564 (c) 0.50 % Total borrowings $ 857,211 2.07 % $ 1,663,156 2.41 % (a) The interest rates for floating rate borrowings under the global revolving credit facility currently equal the applicable index plus a margin of 90 basis points, which is based on the credit rating of our long-term debt. (b) Based on exchange rates of $1.12 to €1.00, $0.71 to 1.00 AUD, $0.13 to 1.00 HKD, $0.01 to 1.00 JPY, $0.74 to 1.00 SGD and $0.75 to 1.00 CAD, respectively, as of March 31, 2019 . (c) Based on exchange rates of $1.28 to £1.00, $1.15 to €1.00, $0.70 to 1.00 AUD, $0.13 to 1.00 HKD, $0.01 to 1.00 JPY, $0.73 to 1.00 SGD and $0.73 to 1.00 CAD, respectively, as of December 31, 2018 . (d) As of March 31, 2019 , approximately $45.0 million of letters of credit were issued. (3) Interest rates are based on our current senior unsecured debt ratings and is currently 100 basis points over the applicable index for floating rate advances for the 2023 Term Loan and the 2024 Term Loan. Two six -month extensions are available for the 2024 Term Loan, which we may exercise if certain conditions are met. (4) We have entered into interest rate swap agreements as a cash flow hedge for interest generated by the U.S. dollar and Canadian dollar borrowings under the global revolving credit facility, the 2023 Term Loan and 2024 Term Loan and the secured note due March 2023. See Note 15 "Derivative Instruments" for further information. (5) Balances as of March 31, 2019 and December 31, 2018 are as follows (balances, in thousands): Denomination of Draw Balance as of March 31, 2019 Weighted-average interest rate Balance as of December 31, 2018 Weighted-average interest rate U.S. dollar ($) $ 300,000 3.48 % (b) $ 300,000 3.46 % (d) Singapore dollar (SGD) 146,876 (a) 2.80 % 146,080 (c) 2.76 % Australian dollar (AUD) 205,997 (a) 2.85 % 204,632 (c) 2.94 % Hong Kong dollar (HKD) 84,995 (a) 2.55 % 85,188 (c) 3.32 % Canadian dollar (CAD) 73,786 (a) 2.98 % (b) 72,220 (c) 3.24 % (d) Total $ 811,654 3.05 % (b) $ 808,120 3.17 % (d) (a) Based on exchange rates of $0.74 to 1.00 SGD, $0.71 to 1.00 AUD, $0.13 to 1.00 HKD and $0.75 to 1.00 CAD, respectively, as of March 31, 2019 . (b) As of March 31, 2019 , the weighted-average interest rate reflecting interest rate swaps was 2.44% (U.S. dollar), 1.78% (Canadian dollar) and 2.56% (Total). See Note 15 "Derivative Instruments" for further discussion on interest rate swaps. (c) Based on exchange rates of $0.73 to 1.00 SGD, $0.70 to 1.00 AUD, $0.13 to 1.00 HKD and $0.73 to 1.00 CAD, respectively, as of December 31, 2018 . (d) As of December 31, 2018 , the weighted-average interest rate reflecting interest rate swaps was 2.44% (U.S. dollar), 1.78% (Canadian dollar) and 2.66% (Total). (6) Based on exchange rates of $1.12 to €1.00 as of March 31, 2019 and $1.15 to €1.00 as of December 31, 2018 . (7) Based on exchange rates of $1.30 to £1.00 as of March 31, 2019 and $1.28 to £1.00 as of December 31, 2018 . (8) The 5.875% 2020 Notes were paid in full in January 2019 (by tender offer) and February 2019 (by redemption of remaining balance after the tender offer). The tender offer and redemption resulted in an early extinguishment charge of approximately $12.9 million during the three months ended March 31, 2019 . (9) On March 5, 2019, Digital Stout Holding, LLC, a wholly owned subsidiary of the Operating Partnership, issued and sold an additional £150.0 million aggregate principal amount of 2030 Notes. The terms of the 2030 Notes are governed by an indenture, dated as of October 17, 2018, among Digital Stout Holding, LLC, Digital Realty Trust, Inc., the Operating Partnership, Deutsche Trustee Company Limited, as trustee, Deutsche Bank AG, London Branch, as paying agent and a transfer agent, and Deutsche Bank Luxembourg S.A., as registrar and a transfer agent (the “GBP Notes Indenture”), pursuant to which Digital Stout Holding, LLC previously issued £400.0 million in aggregate principal amount of its 2030 Notes. The 2030 Notes will be treated as a single series with the notes previously issued under such GBP Notes Indenture. (10) The debt was deconsolidated as a result of the Ascenty joint venture formed with Brookfield. The indentures governing our debt contain certain covenants, including (1) a leverage ratio not to exceed 60% , (2) a secured debt leverage ratio not to exceed 40% and (3) an interest coverage ratio of greater than 1.50 , and also requires us to maintain total unencumbered assets of not less than 150% of the aggregate principal amount of unsecured debt. At March 31, 2019 , we were in compliance with each of these financial covenants. 2.500% Notes due 2026 On January 16, 2019, Digital Euro Finco, LLC, a wholly owned indirect finance subsidiary of the Operating Partnership, issued and sold €850 million aggregate principal amount of 2.500% Guaranteed Notes due 2026 denominated in Euros (the “2026 Notes”). The 2026 Notes are senior unsecured obligations of Digital Euro Finco, LLC and are fully and unconditionally guaranteed by Digital Realty Trust, Inc. and the Operating Partnership. The terms of the 2026 Notes are governed by an indenture, dated as of January 16, 2019, among Digital Euro Finco, LLC, Digital Realty Trust, Inc., the Operating Partnership, Deutsche Trustee Company Limited, as trustee, Deutsche Bank AG, London Branch, as paying agent and a transfer agent, and Deutsche Bank Luxembourg S.A., as registrar and a transfer agent (the “Indenture”). Net proceeds from the offering were approximately €843.5 million (approximately $960.9 million based on the exchange rate on January 16, 2019) after deducting managers’ discounts and estimated offering expenses. We intend to allocate an amount equal to the net proceeds from the offering of the 2026 Notes to finance or refinance, in whole or in part, certain green building, energy and resource efficiency and renewable energy projects (collectively, “Eligible Green Projects”), including the development and redevelopment of such projects. Pending the allocation of an amount equal to the net proceeds of the 2026 Notes to Eligible Green Projects, all or a portion of an amount equal to the net proceeds may be used for the payment of outstanding indebtedness or other capital management activities. Such indebtedness to be redeemed or repaid included the Operating Partnership’s 5.875% Senior Notes due 2020 pursuant to a previously announced tender offer for such notes. On March 6, 2019, Digital Euro Finco, LLC issued and sold an additional €225.0 million aggregate principal amount of 2026 Notes. The terms of the additional 2026 Notes are governed by the Indenture pursuant to which Digital Euro Finco, LLC previously issued €850.0 million in aggregate principal amount of its 2026 Notes. The 2026 Notes issued in March 2019 will be treated as a single series with the notes previously issued under the Indenture. The table below summarizes our debt maturities and principal payments as of March 31, 2019 (in thousands): Global Revolving (1) Unsecured (1) Senior Notes Secured Debt Total Debt Remainder of 2019 $ — $ — $ 140,225 $ 488 $ 140,713 2020 — — 500,000 1,133 501,133 2021 — — 400,000 — 400,000 2022 — — 800,000 — 800,000 2023 684,278 811,654 741,050 104,000 2,340,982 Thereafter 172,933 — 5,999,440 — 6,172,373 Subtotal $ 857,211 $ 811,654 $ 8,580,715 $ 105,621 $ 10,355,201 Unamortized discount — — (18,584 ) — (18,584 ) Unamortized premium — — 7,064 124 7,188 Total $ 857,211 $ 811,654 $ 8,569,195 $ 105,745 $ 10,343,805 (1) The global revolving credit facility and 2024 Term Loan are subject to two six -month extension options exercisable by us. The bank group is obligated to grant the extension options provided we give proper notice, we make certain representations and warranties and no default exists under the global revolving credit facility.

Income per Share

Income per Share	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Income per Share	Income per Share The following is a summary of basic and diluted income per share (in thousands, except share and per share amounts): Three Months Ended March 31, 2019 2018 Net income available to common stockholders $ 95,869 $ 86,298 Weighted average shares outstanding—basic 207,809,383 205,714,173 Potentially dilutive common shares: Unvested incentive units 323,064 302,016 Forward equity offering 221,448 — Market performance-based awards 172,354 491,287 Weighted average shares outstanding—diluted 208,526,249 206,507,476 Income per share: Basic $ 0.46 $ 0.42 Diluted $ 0.46 $ 0.42 We have excluded the following potentially dilutive securities in the calculations above as they would be antidilutive or not dilutive: Three Months Ended March 31, 2019 2018 Weighted average of Operating Partnership common units not owned by Digital Realty Trust, Inc. 9,229,911 8,295,287 Potentially dilutive Series C Cumulative Redeemable Perpetual Preferred Stock 1,738,781 1,967,430 Potentially dilutive Series G Cumulative Redeemable Preferred Stock 2,155,992 2,439,505 Potentially dilutive Series H Cumulative Redeemable Preferred Stock 3,159,382 3,574,840 Potentially dilutive Series I Cumulative Redeemable Preferred Stock 2,158,515 2,442,359 Potentially dilutive Series J Cumulative Redeemable Preferred Stock 1,722,138 1,948,598 Potentially dilutive Series K Cumulative Redeemable Preferred Stock 358,008 — Total 20,522,727 20,668,019

Income per Unit

Income per Unit	3 Months Ended
	Mar. 31, 2019
Digital Realty Trust, L.P.
Class of Stock [Line Items]
Income per Unit	Income per Unit The following is a summary of basic and diluted income per unit (in thousands, except unit and per unit amounts): Three Months Ended March 31, 2019 2018 Net income available to common unitholders $ 100,169 $ 89,778 Weighted average units outstanding—basic 217,039,295 214,009,460 Potentially dilutive common units: Unvested incentive units 323,064 302,016 Forward equity offering 221,448 — Market performance-based awards 172,354 491,287 Weighted average units outstanding—diluted 217,756,161 214,802,763 Income per unit: Basic $ 0.46 $ 0.42 Diluted $ 0.46 $ 0.42 We have excluded the following potentially dilutive securities in the calculations above as they would be antidilutive or not dilutive: Three Months Ended March 31, 2019 2018 Potentially dilutive Series C Cumulative Redeemable Perpetual Preferred Units 1,738,781 1,967,430 Potentially dilutive Series G Cumulative Redeemable Preferred Units 2,155,992 2,439,505 Potentially dilutive Series H Cumulative Redeemable Preferred Units 3,159,382 3,574,840 Potentially dilutive Series I Cumulative Redeemable Preferred Units 2,158,515 2,442,359 Potentially dilutive Series J Cumulative Redeemable Preferred Units 1,722,138 1,948,598 Potentially dilutive Series K Cumulative Redeemable Preferred Units 358,008 — Total 11,292,816 12,372,732

Income Taxes

Income Taxes	3 Months Ended
	Mar. 31, 2019
Income Tax Disclosure [Abstract]
Income Taxes	Income Taxes Digital Realty Trust, Inc. has elected to be treated and believes that it has been organized and has operated in a manner that has enabled it to qualify as a REIT for federal income tax purposes. As a REIT, Digital Realty Trust, Inc. is generally not subject to corporate level federal income taxes on taxable income distributed currently to its stockholders. Since inception, Digital Realty Trust, Inc. has distributed at least 100% of its taxable income annually. As such, no provision for federal income taxes has been included in the Company's accompanying condensed consolidated financial statements for the three months ended March 31, 2019 and 2018 . The Operating Partnership is a partnership and is not required to pay federal income tax. Instead, taxable income is allocated to its partners, who include such amounts on their federal income tax returns. As such, no provision for federal income taxes has been included in the Operating Partnership’s accompanying condensed consolidated financial statements. We have elected taxable REIT subsidiary (“TRS”) status for some of our consolidated subsidiaries. In general, a TRS may provide services that would otherwise be considered impermissible for REITs to provide and may hold assets that REITs cannot hold directly. Income taxes for TRS entities were accrued, as necessary, for the three months ended March 31, 2019 and 2018 . For our TRS entities and foreign subsidiaries that are subject to U.S. federal, state and foreign income taxes, deferred tax assets and liabilities are established for temporary differences between the financial reporting basis and the tax basis of assets and liabilities at the enacted tax rates expected to be in effect when the temporary differences reverse. A valuation allowance for deferred tax assets is provided if we believe it is more likely than not that the deferred tax asset may not be realized, based on available evidence at the time the determination is made. An increase or decrease in the valuation allowance that results from the change in circumstances that causes a change in our judgment about the realizability of the related deferred tax asset is included in the income statement. Deferred tax assets (net of valuation allowance) and liabilities for our TRS entities and foreign subsidiaries were accrued, as necessary, for the three months ended March 31, 2019 and 2018 . As of March 31, 2019 and December 31, 2018 , we had deferred tax liabilities net of deferred tax assets of approximately $148.0 million and $146.6 million , respectively, primarily related to our foreign properties, classified in accounts payable and other accrued expenses in the consolidated balance sheet. The majority of our net deferred tax liability relates to differences between tax basis and book basis of the assets acquired in the Sentrum portfolio acquisition during 2012 and the European Portfolio Acquisition in July 2016. The valuation allowance against the deferred tax assets at March 31, 2019 and December 31, 2018 relate primarily to net operating loss carryforwards attributable to certain foreign jurisdictions and from the acquisition of Telx Acquisition, that we do not expect to utilize. The federal tax legislation enacted in December 2017, commonly known as the Tax Cuts and Jobs Act (the “TCJA”), reduced the corporate federal tax rate in the U.S. to 21%, generally effective on January 1, 2018. As such, deferred tax assets and liabilities were remeasured using the lower corporate federal tax rate at December 31, 2017. While we do not expect other material impacts, the new tax rules are complex and, in some respects, lack developed administrative guidance. We continue to work with our tax advisors to analyze and determine the full impact that the TCJA as a whole will have on us.

Equity and Accumulated Other Co

Equity and Accumulated Other Comprehensive Loss, Net	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Equity and Accumulated Other Comprehensive Loss, Net	Equity and Accumulated Other Comprehensive Loss, Net (a) Equity Distribution Agreements On January 4, 2019, Digital Realty Trust, Inc. and Digital Realty Trust, L.P. entered into equity distribution agreements, which we refer to as the 2019 Equity Distribution Agreements, with each of Merrill Lynch, Pierce, Fenner & Smith Incorporated, Barclays Capital Inc., BTIG, LLC, Credit Suisse Securities (USA) LLC, Deutsche Bank Securities Inc., J.P. Morgan Securities LLC, Mizuho Securities USA LLC, Morgan Stanley & Co. LLC, MUFG Securities Americas Inc., PNC Capital Markets LLC, Raymond James & Associates, Inc., RBC Capital Markets, LLC, Scotia Capital (USA) Inc., SMBC Nikko Securities America, Inc., SunTrust Robinson Humphrey, Inc., TD Securities (USA) LLC, and Wells Fargo Securities, LLC, or the Agents, under which it can issue and sell shares of its common stock having an aggregate offering price of up to $1.0 billion from time to time through, at its discretion, any of the Agents as its sales agents or as principals. Sales may also be made on a forward basis pursuant to separate forward sale agreements. The sales of common stock made under the 2019 Equity Distribution Agreements will be made in “at the market” offerings as defined in Rule 415 of the Securities Act. No sales were made under the program during the three months ended March 31, 2019 . (b) Forward Equity Sale On September 27, 2018, Digital Realty Trust, Inc. completed an underwritten public offering of 9,775,000 shares of its common stock (including 1,275,000 shares from the exercise in full of the underwriters' option to purchase additional shares), all of which were offered in connection with forward sale agreements it entered into with certain financial institutions acting as forward purchasers. The forward purchasers borrowed and sold an aggregate of 9,775,000 shares of Digital Realty Trust, Inc.’s common stock in the public offering. Digital Realty Trust, Inc. did not receive any proceeds from the sale of our common stock by the forward purchasers in the public offering. The Company expects to receive net proceeds of approximately $1.1 billion (net of fees and estimated expenses) upon full physical settlement of the forward sale agreements, which is anticipated to be no later than September 27, 2019. (c) 5.850% Series K Cumulative Redeemable Preferred Stock On March 13, 2019, Digital Realty Trust, Inc. issued 8,000,000 shares of its 5.850% series K cumulative redeemable preferred stock, or the series K preferred stock, for net proceeds of approximately $193.7 million . In addition, on March 15, 2019, Digital Realty Trust, Inc. issued an additional 400,000 shares of series K preferred stock pursuant to a partial exercise of the underwriters’ over-allotment option for net proceeds of approximately $9.7 million . Dividends are cumulative on the series K preferred stock from the date of original issuance in the amount of $1.46250 per share each year, which is equivalent to 5.850% of the $25.00 liquidation preference per share. Dividends on the series K preferred stock are payable quarterly in arrears. The first dividend payable on the series K preferred stock on June 28, 2019 will be a pro rata dividend from and including the original issue date to and including June 30, 2019 in the amount of $0.43875 per share. The series K preferred stock does not have a stated maturity date and is not subject to any sinking fund or mandatory redemption provisions. Upon liquidation, dissolution or winding up, the series K preferred stock will rank senior to Digital Realty Trust, Inc. common stock and rank on parity with Digital Realty Trust, Inc.’s series C cumulative redeemable perpetual preferred stock, series G cumulative redeemable preferred stock, series H cumulative redeemable preferred stock, series I cumulative redeemable preferred stock and series J cumulative redeemable preferred stock with respect to the payment of distributions and other amounts. Digital Realty Trust, Inc. is not allowed to redeem the series K preferred stock before March 13, 2024, except in limited circumstances to preserve its status as a REIT. On or after March 13, 2024, Digital Realty Trust, Inc. may, at its option, redeem the series K preferred stock, in whole or in part, at any time or from time to time, for cash at a redemption price of $25.00 per share, plus all accrued and unpaid dividends on such series K preferred stock up to but excluding the redemption date. Holders of the series K preferred stock generally have no voting rights except for limited voting rights if Digital Realty Trust, Inc. fails to pay dividends for six or more quarterly periods (whether or not consecutive) and in certain other circumstances. Upon the occurrence of specified changes of control, as a result of which neither Digital Realty Trust, Inc.’s common stock nor the common securities of the acquiring or surviving entity (or American Depositary Receipts representing such securities) is listed on the New York Stock Exchange, the NYSE MKT, LLC or the NASDAQ Stock Market or listed or quoted on a successor exchange or quotation system, each holder of series K preferred stock will have the right (unless, prior to the change of control conversion date specified in the Articles Supplementary governing the series K preferred stock, Digital Realty Trust, Inc. has provided or provides notice of its election to redeem the series K preferred stock) to convert some or all of the series K preferred stock held by it into a number of shares of Digital Realty Trust, Inc.’s common stock per share of series K preferred stock to be converted equal to the lesser of: • the quotient obtained by dividing (i) the sum of (x) the $25.00 liquidation preference plus (y) the amount of any accrued and unpaid dividends to, but not including, the change of control conversion date (unless the change of control conversion date is after a record date for a Series K Preferred Stock dividend payment and prior to the corresponding Series K Preferred Stock dividend payment date, in which case no additional amount for such accrued and unpaid dividend will be included in this sum) by (ii) the common stock price specified in the Articles Supplementary governing the series K preferred stock; and • 0.43611 (i.e., the share cap), subject to certain adjustments; subject, in each case, to provisions for the receipt of alternative consideration as described in the Articles Supplementary governing the series K preferred stock. Except in connection with specified change of control transactions, the series K preferred stock is not convertible into or exchangeable for any other property or securities of Digital Realty Trust, Inc. (d) Noncontrolling Interests in Operating Partnership Noncontrolling interests in the Operating Partnership relate to the interests that are not owned by Digital Realty Trust, Inc. The following table shows the ownership interests in the Operating Partnership as of March 31, 2019 and December 31, 2018 : March 31, 2019 December 31, 2018 Number of units Percentage of total Number of units Percentage of total Digital Realty Trust, Inc. 208,214,139 95.6 % 206,425,656 95.1 % Noncontrolling interests consist of: Common units held by third parties 4,858,794 2.2 % 6,297,272 2.9 % Issuance of units in connection with Ascenty Acquisition 2,338,874 1.1 % 2,338,874 1.1 % Incentive units held by employees and directors (see Note 13) 2,275,791 1.1 % 1,944,738 0.9 % 217,687,598 100.0 % 217,006,540 100.0 % Limited partners have the right to require the Operating Partnership to redeem part or all of their common units for cash based on the fair market value of an equivalent number of shares of Digital Realty Trust, Inc. common stock at the time of redemption. Alternatively, Digital Realty Trust, Inc. may elect to acquire those common units in exchange for shares of Digital Realty Trust, Inc. common stock on a one -for-one basis, subject to adjustment in the event of stock splits, stock dividends, issuance of stock rights, specified extraordinary distributions and similar events. Pursuant to authoritative accounting guidance, Digital Realty Trust, Inc. evaluated whether it controls the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the share settlement of the noncontrolling Operating Partnership common and incentive units. Based on the results of this analysis, we concluded that the common units and incentive units of the Operating Partnership met the criteria to be classified within equity, except for certain common units issued to certain former DFT Operating Partnership unitholders in the DFT Merger, which are subject to certain restrictions and, accordingly, are not presented as permanent equity in the condensed consolidated balance sheet. In connection with the initial public offering of DFT in 2007, DFT, the DFT Operating Partnership and certain DFT Operating Partnership unitholders entered into a tax protection agreement to assist such unitholders in deferring certain U.S. federal income tax liabilities that may have otherwise resulted from the contribution transactions undertaken in connection with the initial public offering and the ownership of interests in the DFT Operating Partnership and to set forth certain agreements with respect to other tax matters. In connection with the DFT Merger, certain DFT Operating Partnership unitholders entered into a new tax protection agreement with Digital Realty Trust, Inc. and the Operating Partnership that replaced and superseded the DFT tax protection agreement, effective as of the closing of the merger. Pursuant to the new tax protection agreement, such DFT Operating Partnership unitholders entered into a guarantee of certain debt of a subsidiary of the Operating Partnership. The Operating Partnership must offer such DFT Operating Partnership unitholders a new guarantee opportunity in the event any guaranteed debt is repaid prior to March 1, 2023. If the Operating Partnership fails to offer the guarantee opportunity or to allocate guaranteed debt to any such DFT Operating Partnership unitholder as required under the new tax protection agreement, the Operating Partnership generally would be required to indemnify each such DFT Operating Partnership unitholder for the tax liability resulting from such failure, as determined under the new tax protection agreement. The redemption value of the noncontrolling Operating Partnership common units and the vested incentive units was approximately $1,070.7 million and $1,076.9 million based on the closing market price of Digital Realty Trust, Inc. common stock on March 31, 2019 and December 31, 2018 , respectively. The following table shows activity for the noncontrolling interests in the Operating Partnership for the three months ended March 31, 2019 : Common Units Incentive Units Total As of December 31, 2018 8,636,146 1,944,738 10,580,884 Redemption of common units for shares of Digital Realty Trust, Inc. common stock (1) (1,438,478 ) — (1,438,478 ) Conversion of incentive units held by employees and directors for shares of Digital Realty Trust, Inc. common stock (1) — (79,398 ) (79,398 ) Incentive units issued upon achievement of market performance condition — 308,308 308,308 Grant of incentive units to employees and directors — 105,843 105,843 Cancellation / forfeitures of incentive units held by employees and directors — (3,700 ) (3,700 ) As of March 31, 2019 7,197,668 2,275,791 9,473,459 (1) Redemption / conversion of common units was recorded as a reduction to noncontrolling interests in the Operating Partnership and an increase to common stock and additional paid in capital based on the book value per unit in the accompanying condensed consolidated balance sheet of Digital Realty Trust, Inc. (e) Dividends We have declared and paid the following dividends on our common and preferred stock for the three months ended March 31, 2019 (in thousands, except per share data): Date dividend declared Dividend Series C Preferred Stock Series G Preferred Stock Series H Preferred Stock Series I Preferred Stock Series J Preferred Stock Common February 21, 2019 March 29, 2019 $ 3,333 $ 3,672 $ 6,730 $ 3,969 $ 2,625 $ 224,802 Annual rate of dividend per share $ 1.65625 $ 1.46875 $ 1.84375 $ 1.58750 $ 1.31250 $ 4.32000 Distributions out of Digital Realty Trust, Inc.’s current or accumulated earnings and profits are generally classified as dividends whereas distributions in excess of its current and accumulated earnings and profits, to the extent of a stockholder’s U.S. federal income tax basis in Digital Realty Trust, Inc.’s stock, are generally classified as a return of capital. Distributions in excess of a stockholder’s U.S. federal income tax basis in Digital Realty Trust, Inc.’s stock are generally characterized as capital gain. Cash provided by operating activities has generally been sufficient to fund all distributions, however, in the future we may also need to utilize borrowings under the global revolving credit facility to fund all or a portion of distributions. (f) Accumulated Other Comprehensive Loss, Net The accumulated balances for each item within other comprehensive income (loss), net are as follows (in thousands): Foreign currency Cash flow hedge Foreign currency net investment hedge adjustments Accumulated other Balance as of December 31, 2018 $ (158,649 ) $ 17,264 $ 25,738 $ (115,647 ) Net current period change 7,880 (3,614 ) — 4,266 Reclassification of foreign currency translation 21,687 — — 21,687 Reclassification to interest expense from interest — (2,005 ) — (2,005 ) Balance as of March 31, 2019 $ (129,082 ) $ 11,645 $ 25,738 $ (91,699 )

Capital and Accumulated Other C

Capital and Accumulated Other Comprehensive Loss	3 Months Ended
	Mar. 31, 2019
Digital Realty Trust, L.P.
Class of Stock [Line Items]
Capital and Accumulated Other Comprehensive Loss	Capital and Accumulated Other Comprehensive Loss (a) 5.850% Series K Cumulative Redeemable Preferred Stock On March 13, 2019 and March 15, 2019, the Operating Partnership issued in the aggregate a total of 8,400,000 shares of its 5.850% series K cumulative redeemable preferred units, or the series K preferred units, to Digital Realty Trust, Inc. (the General Partner) in conjunction with the General Partner’s issuance of an equivalent number of shares of its 5.850% series K cumulative redeemable preferred stock, or the series K preferred stock. Distributions are cumulative on the series K preferred units from the date of original issuance in the amount of $1.46250 per unit each year, which is equivalent to 5.850% of the $25.00 liquidation preference per unit. Distributions on the series K preferred units are payable quarterly in arrears. The first distribution payable on the series K preferred units on June 28, 2019 will be a pro rata dividend from and including the original issue date to and including June 30, 2019 in the amount of $0.43875 per unit. The series K preferred units do not have a stated maturity date and are not subject to any sinking fund or mandatory redemption provisions. The Operating Partnership is required to redeem the series K preferred units in the event that the General Partner redeems the series K preferred stock. The General Partner is not allowed to redeem the series K preferred stock prior to March 13, 2024 except in limited circumstances to preserve the General Partner’s status as a REIT. On or after March 13, 2024, the General Partner may, at its option, redeem the series K preferred stock, in whole or in part, at any time or from time to time, for cash at a redemption price of $25.00 per share, plus all accrued and unpaid dividends on such series K preferred stock up to but excluding the redemption date. Upon liquidation, dissolution or winding up, the series K preferred units will rank senior to the Operating Partnership’s common units with respect to the payment of distributions and other amounts and rank on parity with the Operating Partnership’s series C cumulative redeemable perpetual preferred units, series G cumulative redeemable preferred units, series H cumulative redeemable preferred units, series I cumulative redeemable preferred units and series J cumulative redeemable preferred units. Except in connection with specified change of control transactions of the General Partner, the series K preferred units are not convertible into or exchangeable for any other property or securities of the Operating Partnership. (b) Allocations of Net Income and Net Losses to Partners Except for special allocations to holders of profits interest units described below in Note 14(a) under the heading “Incentive Plan—Long-Term Incentive Units,” the Operating Partnership’s net income will generally be allocated to Digital Realty Trust, Inc. (the General Partner) to the extent of the accrued preferred return on its preferred units, and then to the General Partner and the Operating Partnership’s limited partners in accordance with the respective percentage interests in the common units issued by the Operating Partnership. Net loss will generally be allocated to the General Partner and the Operating Partnership’s limited partners in accordance with the respective common percentage interests in the Operating Partnership until the limited partner’s capital is reduced to zero and any remaining net loss would be allocated to the General Partner. However, in some cases, losses may be disproportionately allocated to partners who have guaranteed our debt. The allocations described above are subject to special allocations relating to depreciation deductions and to compliance with the provisions of Sections 704(b) and 704(c) of the Code, and the associated Treasury Regulations. (c) Forward Equity Sale On September 27, 2018, Digital Realty Trust, Inc. completed an underwritten public offering of 9,775,000 shares of its common stock (including 1,275,000 shares from the exercise in full of the underwriters' option to purchase additional shares), all of which were offered in connection with forward sale agreements it entered into with certain financial institutions acting as forward purchasers. The forward purchasers borrowed and sold an aggregate of 9,775,000 shares of Digital Realty Trust, Inc.’s common stock in the public offering. Digital Realty Trust, Inc. did not receive any proceeds from the sale of our common stock by the forward purchasers in the public offering. The Company expects to receive net proceeds of approximately $1.1 billion (net of fees and estimated expenses) upon full physical settlement of the forward sale agreements, which is anticipated to be no later than September 27, 2019. Upon physical settlement of the forward sale agreements, the Operating Partnership is expected to issue partnership units to Digital Realty Trust, Inc. in exchange for contribution of the net proceeds. (d) Partnership Units Limited partners have the right to require the Operating Partnership to redeem part or all of their common units for cash based on the fair market value of an equivalent number of shares of the General Partner’s common stock at the time of redemption. Alternatively, the General Partner may elect to acquire those common units in exchange for shares of the General Partner’s common stock on a one -for-one basis, subject to adjustment in the event of stock splits, stock dividends, issuance of stock rights, specified extraordinary distributions and similar events. Pursuant to authoritative accounting guidance, Digital Realty Trust, Inc. evaluated whether it controls the actions or events necessary to issue the maximum number of shares that could be required to be delivered under the share settlement of the noncontrolling Operating Partnership common and incentive units. Based on the results of this analysis, we concluded that the common units and incentive units of the Operating Partnership met the criteria to be classified within capital, except for certain common units issued to certain former DFT Operating Partnership unitholders in the DFT Merger, which are subject to certain restrictions and, accordingly, are not presented as permanent capital in the condensed consolidated balance sheet. In connection with the initial public offering of DFT in 2007, DFT, the DFT Operating Partnership and certain DFT Operating Partnership unitholders entered into a tax protection agreement to assist such unitholders in deferring certain U.S. federal income tax liabilities that may have otherwise resulted from the contribution transactions undertaken in connection with the initial public offering and the ownership of interests in the DFT Operating Partnership and to set forth certain agreements with respect to other tax matters. In connection with the DFT Merger, certain DFT Operating Partnership unitholders entered into a new tax protection agreement with Digital Realty Trust, Inc. and the Operating Partnership that replaced and superseded the DFT tax protection agreement, effective as of the closing of the DFT Merger. Pursuant to the new tax protection agreement, such DFT Operating Partnership unitholders entered into a guarantee of certain debt of a subsidiary of the Operating Partnership. The Operating Partnership must offer such DFT Operating Partnership unitholders a new guarantee opportunity in the event any guaranteed debt is repaid prior to March 1, 2023. If the Operating Partnership fails to offer the guarantee opportunity or to allocate guaranteed debt to any such DFT Operating Partnership unitholder as required under the new tax protection agreement, the Operating Partnership generally would be required to indemnify each such DFT Operating Partnership unitholder for the tax liability resulting from such failure, as determined under the new tax protection agreement. The redemption value of the limited partners’ common units and the vested incentive units was approximately $1,070.7 million and $1,076.9 million based on the closing market price of Digital Realty Trust, Inc.’s common stock on March 31, 2019 and December 31, 2018 , respectively. (e) Distributions All distributions on the Operating Partnership’s units are at the discretion of Digital Realty Trust, Inc.’s board of directors. The Operating Partnership has declared and paid the following distributions on its common and preferred units for the three months ended March 31, 2019 (in thousands, except for per unit data): Date distribution declared Distribution Series C Preferred Units Series G Preferred Units Series H Preferred Units Series I Preferred Units Series J Preferred Units Common February 21, 2019 March 29, 2019 $ 3,333 $ 3,672 $ 6,730 $ 3,969 $ 2,625 $ 235,256 Annual rate of distribution per unit $ 1.65625 $ 1.46875 $ 1.84375 $ 1.58750 $ 1.31250 $ 4.32000 (f) Accumulated Other Comprehensive Loss The accumulated balances for each item within other comprehensive income are as follows (in thousands): Foreign currency Cash flow hedge Foreign currency net investment hedge adjustments Accumulated other Balance as of December 31, 2018 $ (163,531 ) $ 16,986 $ 26,152 $ (120,393 ) Net current period change 9,193 (3,775 ) — 5,418 Reclassification of foreign currency translation 21,687 — — 21,687 Reclassification to interest expense from interest rate swaps — (2,094 ) — (2,094 ) Balance as of March 31, 2019 $ (132,651 ) $ 11,117 $ 26,152 $ (95,382 )

Incentive Plan

Incentive Plan	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Incentive Plan	Incentive Plan On April 28, 2014, our stockholders approved the Digital Realty Trust, Inc., Digital Services, Inc., and Digital Realty Trust, L.P. 2014 Incentive Award Plan (as amended, the 2014 Incentive Award Plan). The 2014 Incentive Award Plan became effective and replaced the Amended and Restated 2004 Incentive Award Plan, as amended, as of the date of such stockholder approval. The material features of the 2014 Incentive Award Plan are described in our definitive Proxy Statement filed on March 19, 2014 in connection with the 2014 Annual Meeting, which description is incorporated herein by reference. Effective as of September 14, 2017, the 2014 Incentive Award Plan was amended to provide that shares which remained available for issuance under DFT’s Amended and Restated 2011 Equity Incentive Plan immediately prior to the closing of the DFT Merger (as adjusted and converted into shares of Digital Realty Trust, Inc.’s common stock) may be used for awards under the 2014 Incentive Award Plan and will not reduce the shares authorized for grant under the 2014 Incentive Award Plan, to the extent that using such shares is permitted without stockholder approval under applicable stock exchange rules. In connection with the amendment to the 2014 Incentive Award Plan, on September 22, 2017, Digital Realty Trust, Inc. registered an additional 3.7 million shares that may be issued pursuant to the 2014 Incentive Award Plan. As of March 31, 2019 , approximately 6.6 million shares of common stock, including awards convertible into or exchangeable for shares of common stock, remained available for future issuance under the 2014 Incentive Award Plan. Each long-term incentive unit and each Class D unit issued under the 2014 Incentive Award Plan counts as one share of common stock for purposes of calculating the limit on shares that may be issued under the 2014 Incentive Award Plan and the individual award limits set forth therein. Below is a summary of our compensation expense for the three months ended March 31, 2019 and 2018 and our unearned compensation as of March 31, 2019 and December 31, 2018 (in millions): Deferred Compensation Unearned Compensation Expected period to recognize unearned compensation (in years) Expensed Capitalized As of March 31, 2019 As of December 31, 2018 Three Months Ended March 31, Type of incentive award 2019 2018 2019 2018 Long-term incentive units $ 1.4 $ 0.9 $ — $ 0.2 $ 21.9 $ 11.5 2.9 Market performance-based awards 3.1 3.1 0.2 0.3 40.7 24.8 2.6 Restricted stock 2.6 1.5 0.6 1.1 39.8 23.6 3.2 (a) Long-Term Incentive Units Long-term incentive units, which are also referred to as profits interest units, may be issued to eligible participants for the performance of services to or for the benefit of the Operating Partnership. Long-term incentive units (other than Class D units), whether vested or not, will receive the same quarterly per unit distributions as Operating Partnership common units, which equal the per share distributions on Digital Realty Trust, Inc. common stock. Initially, long-term incentive units do not have full parity with common units with respect to liquidating distributions. If such parity is reached, vested long-term incentive units may be converted into an equal number of common units of the Operating Partnership at any time, and thereafter enjoy all the rights and privileges of common units of the Operating Partnership, including redemption rights. For a discussion of how long-term incentive units achieve parity with common units, see Note 14(a) to our consolidated financial statements for the fiscal year ended December 31, 2018 , included in our Annual Report on 10-K for the year ended December 31, 2018 . Below is a summary of our long-term incentive unit activity for the three months ended March 31, 2019 . Unvested Long-term Incentive Units Units Weighted-Average Grant Date Fair Value Unvested, beginning of period 158,486 $ 100.94 Granted 105,135 116.07 Vested (50,201 ) 81.47 Unvested, end of period 213,420 $ 98.10 The grant date fair values, which equal the market price of Digital Realty Trust, Inc. common stock on the applicable grant date(s), are being expensed on a straight-line basis for service awards between two and four years, the current vesting period of the long-term incentive units. (b) Market Performance-Based Awards During the three months ended March 31, 2019 and 2018, the Compensation Committee of the Board of Directors of Digital Realty Trust, Inc. approved the grant of market performance-based Class D units of the Operating Partnership and market performance-based restricted stock units, or RSUs, covering shares of Digital Realty Trust, Inc.’s common stock (collectively, the “awards”), under the 2014 Incentive Award Plan to officers and employees of the Company. The awards, which were determined to contain a market condition, utilize total shareholder return, or TSR, over a three -year measurement period as the market performance metric. Awards will vest based on Digital Realty Trust, Inc.’s TSR relative to the MSCI US REIT Index, or RMS, over a three -year market performance period, or the Market Performance Period, commencing in January 2019 or January 2018, as applicable (or, if earlier, ending on the date on which a change in control of the Company occurs), subject to continued services. Vesting with respect to the market condition is measured based on the difference between Digital Realty Trust, Inc.’s TSR percentage and the TSR percentage of the RMS, or the RMS Relative Market Performance. In the event that the RMS Relative Market Performance during the Market Performance Period is achieved at the “threshold,” “target” or “high” level as set forth below, the awards will become vested as to the market condition with respect to the percentage of Class D units or RSUs, as applicable, set forth below: Level RMS Relative Market Performance Vesting Percentage Below Threshold Level ≤ -300 basis points 0% Threshold Level -300 basis points 25% Target Level 100 basis points 50% High Level > 500 basis points 100% If the RMS Relative Market Performance falls between the levels specified above, the percentage of the award that will vest with respect to the market condition will be determined using straight-line linear interpolation between such levels. In January 2019, following the completion of the applicable Market Performance Period, the Compensation Committee determined that the high level had been achieved for the 2016 awards and, accordingly, 339,317 class D units (including 31,009 distribution equivalent units that immediately vested on December 31, 2018 upon the high level being achieved) and 56,778 RSUs performance vested, subject to service-based vesting. On February 27, 2019, 50% of the 2016 awards vested and the remaining 50% will vest on February 27, 2020, subject to continued employment through the vesting date. Following the completion of the applicable Market Performance Period, the 2017 awards that satisfy the market condition, if any, will vest 50% on February 27, 2020 and 50% on February 27, 2021, subject to continued employment through each applicable vesting date. Following the completion of the applicable Market Performance Period, the 2018 awards that satisfy the market condition, if any, will vest 50% on February 27, 2021 and 50% on February 27, 2022, subject to continued employment through each applicable vesting date. Following the completion of the applicable Market Performance Period, the 2019 awards that satisfy the market condition, if any, will vest 50% on February 27, 2022 and 50% on February 27, 2023, subject to continued employment through each applicable vesting date. In the event of a change in control, termination of employment by the Company without cause, or termination of employment by the award recipient for good reason, death, disability or retirement, service-based vesting will be accelerated, in full or on a pro rata basis in any case prior to the completion of the Market Performance Period. However, vesting with respect to the market condition will continue to be measured based on RMS Relative Market Performance during the three -year Market Performance Period (or, in the case of a change in control, shortened Market Performance Period). The fair values of the 2019 awards and 2018 awards granted were measured using a Monte Carlo simulation to estimate the probability of the market vesting condition being satisfied. Digital Realty Trust, Inc.’s achievement of the market vesting condition is contingent on its TSR over a three -year market performance period, relative to the total shareholder return of the RMS. The Monte Carlo simulation is a probabilistic technique based on the underlying theory of the Black-Scholes formula, which was run for 100,000 trials to determine the fair value of the awards. For each trial, the payoff to an award is calculated at the settlement date and is then discounted to the grant date at a risk-free interest rate. The total expected value of the awards on the grant date was determined by multiplying the average value per award over all trials by the number of awards granted. Assumptions used in the valuations are summarized as follows: Award Date Expected Stock Price Volatility Risk-Free Interest rate January 1, 2018 22% 1.98% March 1, 2018 22% 2.34% March 9, 2018 22% 2.42% January 1, 2019 23% 2.44% February 21, 2019 23% 2.48% These valuations were performed in a risk-neutral framework, so no assumption was made with respect to an equity risk premium. The grant date fair value of the Class D and RSU awards was approximately $20.3 million and $17.5 million for the three months ended March 31, 2019 and 2018, respectively. We will recognize compensation expense on a straight-line basis over the expected service period of approximately four years. (c) Restricted Stock Below is a summary of our restricted stock activity for the three months ended March 31, 2019 . Unvested Restricted Stock Shares Weighted-Average Grant Date Fair Value Unvested, beginning of period 295,501 $ 97.49 Granted 195,171 114.38 Vested (94,388 ) 92.00 Cancelled or expired (3,724 ) 105.88 Unvested, end of period 392,560 $ 109.07 The grant date fair values, which equal the market price of Digital Realty Trust, Inc. common stock on the grant date, are expensed on a straight-line basis for service awards over the vesting period of the restricted stock, which is generally four years.

Derivative Instruments

Derivative Instruments	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments	Derivative Instruments Currently, we use interest rate swaps to manage our interest rate risk. The valuation of these instruments is determined using widely accepted valuation techniques including discounted cash flow analysis on the expected cash flows of each derivative. This analysis reflects the contractual terms of the derivatives, including the period to maturity, and uses observable market-based inputs, including interest rate curves. The fair values of interest rate swaps are determined using the market standard methodology of netting the discounted future fixed cash receipts (or payments) and the discounted expected variable cash payments (or receipts). The variable cash payments (or receipts) are based on an expectation of future interest rates (forward curves) derived from observable market interest rate curves. To comply with the provisions of fair value accounting guidance, we incorporate credit valuation adjustments to appropriately reflect both our own nonperformance risk and the respective counterparty’s nonperformance risk in the fair value measurements. In adjusting the fair value of our derivative contracts for the effect of nonperformance risk, we have considered the impact of netting and any applicable credit enhancements, such as collateral postings, thresholds, mutual puts, and guarantees. Although we have determined that the majority of the inputs used to value our derivatives fall within Level 2 of the fair value hierarchy, the credit valuation adjustments associated with our derivatives utilize Level 3 inputs, such as estimates of current credit spreads to evaluate the likelihood of default by us and our counterparties. However, as of March 31, 2019 , we have assessed the significance of the impact of the credit valuation adjustments on the overall valuation of our derivative positions and have determined that the credit valuation adjustments are not significant to the overall valuation of our derivatives. As a result, we have determined that our derivative valuations in their entirety are classified in Level 2 of the fair value hierarchy. We do not have any fair value measurements on a recurring basis using significant unobservable inputs (Level 3) as of March 31, 2019 or December 31, 2018 . The Company presents its interest rate derivatives in its condensed consolidated balance sheets on a gross basis as interest rate swap assets (recorded in other assets) and interest rate swap liabilities (recorded in accounts payable and other accrued liabilities). As of March 31, 2019 , there was no impact from netting arrangements as the Company did not have any derivatives in liability positions. Cash Flow Hedges of Interest Rate Risk Our objectives in using interest rate derivatives are to add stability to interest expense and to manage our exposure to interest rate movements related to certain floating rate debt obligations. To accomplish this objective, we primarily use interest rate swaps as part of our interest rate risk management strategy. Interest rate swaps designated as cash flow hedges involve the receipt of variable-rate amounts from a counterparty in exchange for making fixed-rate payments over the life of the agreements without exchange of the underlying notional amount. We record all our interest rate swaps on the condensed consolidated balance sheet at fair value. In determining the fair value of our interest rate swaps, we consider the credit risk of our counterparties. These counterparties are generally larger financial institutions engaged in providing a variety of financial services. These institutions generally face similar risks regarding adverse changes in market and economic conditions, including, but not limited to, fluctuations in interest rates, exchange rates, equity and commodity prices and credit spreads. The recent and pervasive disruptions in the financial markets have heightened the risks to these institutions. As of March 31, 2019 and December 31, 2018 , we had the following outstanding interest rate derivatives that were designated as effective cash flow hedges of interest rate risk (in thousands): Notional Amount Fair Value at Significant Other As of March 31, 2019 As of December 31, 2018 Type of Strike Effective Date Expiration Date As of March 31, 2019 (3) As of December 31, 2018 (3) Currently-paying contracts $ 206,000 (1) $ 206,000 (1) Swap 1.611 Jun 15, 2017 Jan 15, 2020 $ 1,311 $ 1,976 54,905 (1) 54,905 (1) Swap 1.605 Jun 6, 2017 Jan 6, 2020 343 517 75,000 (1) 75,000 (1) Swap 1.016 Apr 6, 2016 Jan 6, 2021 1,636 2,169 75,000 (1) 75,000 (1) Swap 1.164 Jan 15, 2016 Jan 15, 2021 1,456 1,970 300,000 (1) 300,000 (1) Swap 1.435 Jan 15, 2016 Jan 15, 2023 7,809 11,463 73,786 (2) 72,220 (2) Swap 0.779 Jan 15, 2016 Jan 15, 2021 1,434 2,024 $ 784,691 $ 783,125 $ 13,989 $ 20,119 (1) Represents debt which bears interest based on one-month U.S. LIBOR. (2) Represents debt which bears interest based on one-month CDOR. Translation to U.S. dollars is based on exchange rates of $0.75 to 1.00 CAD as of March 31, 2019 and $0.73 to 1.00 CAD as of December 31, 2018 . (3) Balance recorded in other assets in the consolidated balance sheets if positive and recorded in accounts payable and other accrued liabilities in the consolidated balance sheets if negative. As of March 31, 2019 , we estimate that an additional $6.2 million will be reclassified as a decrease to interest expense during the twelve months ended March 31, 2020 , when the hedged forecasted transactions impact earnings. Credit-risk-related Contingent Features We have agreements with each of our derivative counterparties that contain a provision where we could be declared in default on our derivative obligations if repayment of the underlying indebtedness is accelerated by the lender due to our default on the indebtedness. As of March 31, 2019 , we did not have any derivatives in a net liability position, and have not posted any collateral related to these agreements.

Fair Value of Financial Instrum

Fair Value of Financial Instruments	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Fair Value of Financial Instruments	Fair Value of Financial Instruments We disclose fair value information about all financial instruments, whether or not recognized in the condensed consolidated balance sheets, for which it is practicable to estimate fair value. Current accounting guidance requires the Company to disclose fair value information about all financial instruments, whether or not recognized in the balance sheets, for which it is practicable to estimate fair value. The Company’s disclosures of estimated fair value of financial instruments at March 31, 2019 and December 31, 2018 were determined using available market information and appropriate valuation methods. Considerable judgment is necessary to interpret market data and develop estimated fair value. The use of different market assumptions or estimation methods may have a material effect on the estimated fair value amounts. The carrying amounts for cash and cash equivalents, restricted cash, accounts and other receivables, accounts payable and other accrued liabilities, accrued dividends and distributions, security deposits and prepaid rents approximate fair value because of the short-term nature of these instruments. As described in Note 15 "Derivative Instruments", the interest rate swaps are recorded at fair value. We calculate the fair value of our secured debt, unsecured term loan and unsecured senior notes based on currently available market rates assuming the loans are outstanding through maturity and considering the collateral and other loan terms. In determining the current market rate for fixed rate debt, a market spread is added to the quoted yields on federal government treasury securities with similar maturity dates to our debt. The carrying value of our global revolving credit facilities approximate fair value, due to the variability of interest rates. As of March 31, 2019 and December 31, 2018 , the aggregate estimated fair value and carrying value of our global revolving credit facility, unsecured term loans, unsecured senior notes and mortgage loans were as follows (in thousands): Categorization under the fair value hierarchy As of March 31, 2019 As of December 31, 2018 Estimated Fair Value Carrying Value Estimated Fair Value Carrying Value Global revolving credit facility (1)(5) Level 2 $ 857,211 $ 857,211 $ 1,663,156 $ 1,663,156 Unsecured term loans (2)(6) Level 2 811,654 811,654 1,183,121 1,183,121 Unsecured senior notes (3)(4)(7) Level 2 8,879,673 8,569,195 7,684,368 7,629,679 Secured debt (3)(8) Level 2 105,769 105,745 706,086 705,924 $ 10,654,307 $ 10,343,805 $ 11,236,731 $ 11,181,880 (1) The carrying value of our global revolving credit facilities approximate estimated fair value, due to the variability of interest rates and the stability of our credit ratings. (2) The carrying value of our unsecured term loans approximates estimated fair value, due to the variability of interest rates and the stability of our credit ratings. (3) Valuations for our unsecured senior notes and secured debt are determined based on the expected future payments discounted at risk-adjusted rates. The 2019 Notes, 3.400% 2020 Notes, 2021 Notes, 3.950% 2022 Notes, 3.625% 2022 Notes, 4.750% 2023 Notes, 2.750% 2023 Notes, 2.625% 2024 Notes, 2.750% 2024 Notes, 4.750% 2025 Notes, 4.250% 2025 Notes, 2026 Notes, 2027 Notes, 2028 Notes, 2029 Notes and 2030 Notes are valued based on quoted market prices. (4) The carrying value of the 3.400% 2020 Notes, 2021 Notes, 3.625% 2022 Notes, 3.950% 2022 Notes, 4.750% 2023 Notes, 2.750% 2023 Notes, 2.625% 2024 Notes, 2.750% 2024 Notes, 4.250% 2025 Notes, 2026 Notes, 2027 Notes, 2028 Notes, 2029 Notes and 2030 Notes are net of discount of $11.5 million and $19.9 million in the aggregate as of March 31, 2019 and December 31, 2018 , respectively. (5) The estimated fair value and carrying value are exclusive of deferred financing costs of $14.2 million and $15.4 million as of March 31, 2019 and December 31, 2018 , respectively. (6) The estimated fair value and carrying value are exclusive of deferred financing costs of $3.9 million and $4.2 million as of March 31, 2019 and December 31, 2018 , respectively. (7) The estimated fair value and carrying value are exclusive of deferred financing costs of $45.7 million and $40.6 million as of March 31, 2019 and December 31, 2018 , respectively. (8) The estimated fair value and carrying value are exclusive of deferred financing costs of $0.3 million and $20.2 million as of March 31, 2019 and December 31, 2018 , respectively.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	Commitments and Contingencies (a) Construction Commitments Our properties require periodic investments of capital for tenant-related capital expenditures and for general capital improvements including ground up construction. From time to time in the normal course of our business, we enter into various construction contracts with third parties that may obligate us to make payments. At March 31, 2019 , we had open commitments, including amounts reimbursable of approximately $22.0 million , related to construction contracts of approximately $376.3 million . (b) Legal Proceedings The Company is involved in legal proceedings arising in the ordinary course of business from time to time. As of March 31, 2019 , the Company is not currently a party to any legal proceedings that it believes would have a material adverse effect on its financial position, results of operations or liquidity nor, to its knowledge, are any such legal proceedings threatened against it.

Subsequent Events

Subsequent Events	3 Months Ended
	Mar. 31, 2019
Subsequent Events [Abstract]
Subsequent Events	Subsequent Events On April 1, 2019, Digital Realty Trust, Inc. redeemed all 14.6 million outstanding shares of its 7.375% series H cumulative redeemable preferred stock, or the series H preferred stock, for $25.00 per share. The redemption price was equal to the original issuance price of $25.00 per share, plus accrued and unpaid dividends up to but not including the redemption date. Digital Realty Trust, Inc. funded the redemption with borrowings under the global revolving credit facility, which the Operating Partnership distributed to Digital Realty Trust, Inc. in connection with the Operating Partnership’s redemption of all 14.6 million of its outstanding series H preferred units held by Digital Realty Trust, Inc. The excess of the redemption price over the carrying value of the series H preferred stock of approximately $11.7 million relates to the original issuance costs and will be reflected as a reduction to net income available to common stockholders.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Principles of Consolidation and Basis of Presentation	Principles of Consolidation and Basis of Presentation The accompanying interim condensed consolidated financial statements include all of the accounts of Digital Realty Trust, Inc., the Operating Partnership and their subsidiaries. Intercompany balances and transactions have been eliminated. The accompanying interim condensed consolidated financial statements are unaudited, but have been prepared in accordance with U.S. generally accepted accounting principles (U.S. GAAP) for interim financial information and in compliance with the rules and regulations of the U.S. Securities and Exchange Commission. Accordingly, they do not include all of the disclosures required by U.S. GAAP for complete financial statements. In the opinion of management, all adjustments necessary for a fair presentation have been included. All such adjustments are considered to be of a normal recurring nature, except as otherwise indicated. The results of operations for the interim periods are not necessarily indicative of the results to be obtained for the full fiscal year. These condensed consolidated financial statements should be read in conjunction with the audited consolidated financial statements and the notes thereto included in our annual report on Form 10-K for the year ended December 31, 2018 . The notes to the condensed consolidated financial statements of Digital Realty Trust, Inc. and the Operating Partnership have been combined to provide the following benefits: • enhancing investors’ understanding of the Company and the Operating Partnership by enabling investors to view the business as a whole in the same manner as management views and operates the business; • eliminating duplicative disclosure and providing a more streamlined and readable presentation since a substantial portion of the disclosure applies to both the Company and the Operating Partnership; and • creating time and cost efficiencies through the preparation of one set of notes instead of two separate sets of notes. There are few differences between the Company and the Operating Partnership, which are reflected in these condensed consolidated financial statements. We believe it is important to understand the differences between the Company and the Operating Partnership in the context of how we operate as an interrelated consolidated company. Digital Realty Trust, Inc.’s only material asset is its ownership of partnership interests of the Operating Partnership. As a result, Digital Realty Trust, Inc. generally does not conduct business itself, other than acting as the sole general partner of the Operating Partnership, issuing public securities from time to time and guaranteeing certain unsecured debt of the Operating Partnership and certain of its subsidiaries and affiliates. Digital Realty Trust, Inc. itself has not issued any indebtedness but guarantees the unsecured debt of the Operating Partnership and certain of its subsidiaries and affiliates, as disclosed in these notes. The Operating Partnership holds substantially all the assets of the Company and holds the ownership interests in the Company’s joint ventures. The Operating Partnership conducts the operations of the business and is structured as a partnership with no publicly traded equity. Except for net proceeds from public equity issuances by Digital Realty Trust, Inc., which are generally contributed to the Operating Partnership in exchange for partnership units, the Operating Partnership generally generates the capital required by the Company’s business primarily through the Operating Partnership’s operations, by the Operating Partnership’s or its affiliates’ direct or indirect incurrence of indebtedness or through the issuance of partnership units. The presentation of noncontrolling interests in operating partnership, stockholders’ equity and partners’ capital are the main areas of difference between the condensed consolidated financial statements of Digital Realty Trust, Inc. and those of the Operating Partnership. The common limited partnership interests held by the limited partners in the Operating Partnership are presented as limited partners’ capital within partners’ capital in the Operating Partnership’s condensed consolidated financial statements and as noncontrolling interests in operating partnership within equity in Digital Realty Trust, Inc.’s condensed consolidated financial statements. The common and preferred partnership interests held by Digital Realty Trust, Inc. in the Operating Partnership are presented as general partner’s capital within partners’ capital in the Operating Partnership’s condensed consolidated financial statements and as preferred stock, common stock, additional paid-in capital and accumulated dividends in excess of earnings within stockholders’ equity in Digital Realty Trust, Inc.’s condensed consolidated financial statements. The differences in the presentations between stockholders’ equity and partners’ capital result from the differences in the equity issued at the Digital Realty Trust, Inc. and the Operating Partnership levels. To help investors understand the significant differences between the Company and the Operating Partnership, these consolidated financial statements present the following separate sections for each of the Company and the Operating Partnership: • condensed consolidated face financial statements; and • the following notes to the condensed consolidated financial statements: • "Debt of the Company" and "Debt of the Operating Partnership"; • "Income per Share" and "Income per Unit"; and • "Equity and Accumulated Other Comprehensive Loss, Net of the Company" and "Capital and Accumulated Other Comprehensive Loss of the Operating Partnership". In the sections that combine disclosure of Digital Realty Trust, Inc. and the Operating Partnership, these notes refer to actions or holdings as being actions or holdings of the Company. Although the Operating Partnership is generally the entity that enters into contracts and joint ventures and holds assets and debt, reference to the Company is appropriate because the business is one enterprise and the Company generally operates the business through the Operating Partnership.
Cash Equivalents	Cash Equivalents For the purpose of the condensed consolidated statements of cash flows, we consider short-term investments with original maturities of 90 days or less to be cash equivalents. As of March 31, 2019 , cash equivalents consist of investments in money market instruments.
Investment in Unconsolidated Joint Ventures	Investments in Unconsolidated Joint Ventures The Company’s investments in unconsolidated joint ventures are accounted for using the equity method, whereby our investment is increased for capital contributed and our share of the joint venture's net income and decreased by distributions we receive and our share of any losses of the joint ventures. We do not record losses of the joint ventures in excess of our investment balances unless we are liable for the obligations of the joint venture or are otherwise committed to provide financial support to the joint venture. Likewise, and as long as we have no explicit or implicit obligations to the joint venture, we will suspend equity method accounting to the extent that cash distributions exceed our investment balances until those unrecorded earnings exceed the excess distributions previously recognized in income. In this case, we will apply cost accounting concepts which tie income recognition to the receipt of cash. Cost basis accounting concepts will apply until earnings exceed the excess distributions previously recognized in income. We amortize the difference between the cost of our investments in the joint ventures and the book value of the underlying equity into income on a straight-line basis consistent with the lives of the underlying assets. The amortization of this difference was immaterial for the three months ended March 31, 2019 and 2018 , respectively.
Impairment of Long-Lived and Finite-Lived Intangible Assets	Impairment of Long-Lived and Finite-Lived Intangible Assets We review each of our properties for indicators that its carrying amount may not be recoverable. Examples of such indicators may include a significant decrease in the market price of the property, a change in the expected holding period for the property, a significant adverse change in how the property is being used or expected to be used based on the underwriting at the time of acquisition, an accumulation of costs significantly in excess of the amount originally expected for the acquisition or development of the property, or a history of operating or cash flow losses of the property. When such impairment indicators exist, we review an estimate of the future undiscounted net cash flows (excluding interest charges) expected to result from the real estate investment’s use and eventual disposition and compare that estimate to the carrying value of the property. We consider factors such as future operating income, trends and prospects, as well as the effects of leasing demand, competition and other factors. If our future undiscounted net cash flow evaluation indicates that we are unable to recover the carrying value of a real estate investment, an impairment loss is recorded to the extent that the carrying value exceeds the estimated fair value of the property. These losses have a direct impact on our net income because recording an impairment loss results in an immediate negative adjustment to net income. The evaluation of anticipated cash flows is highly subjective and is based in part on assumptions regarding future occupancy, rental rates and capital requirements that could differ materially from actual results in future periods. Since cash flows on properties considered to be long-lived assets to be held and used are considered on an undiscounted basis to determine whether the carrying value of a property is recoverable, our strategy of holding properties over the long-term directly decreases the likelihood of their carrying values not being recoverable and therefore requiring the recording of an impairment loss. If our strategy changes or market conditions otherwise dictate an earlier sale date, an impairment loss may be recognized and such loss could be material. If we determine that the asset fails the recoverability test, the affected assets must be reduced to their fair value. We generally estimate the fair value of rental properties utilizing a discounted cash flow analysis that includes projections of future revenues, expenses and capital improvement costs that a market participant would use based on the highest and best use of the asset, which is similar to the income approach that is commonly utilized by appraisers. In certain cases, we may supplement this analysis by obtaining outside broker opinions of value. In considering whether to classify a property as held for sale, the Company considers whether: (i) management has committed to a plan to sell the property; (ii) the property is available for immediate sale in its present condition; (iii) the Company has initiated a program to locate a buyer; (iv) the Company believes that the sale of the property is probable; (v) the Company is actively marketing the property for sale at a price that is reasonable in relation to its current value; and (vi) actions required for the Company to complete the plan indicate that it is unlikely that any significant changes will be made to the plan. If all the above criteria are met, the Company classifies the property as held for sale. Upon being classified as held for sale, the Company ceases all depreciation and amortization related to the property and it is recorded at the lower of its carrying amount or fair value less cost to sell. The assets and related liabilities of the property are classified separately on the condensed consolidated balance sheets for the most recent reporting period. Only those assets held for sale that constitute a strategic shift that has or will have a major effect on our operations are classified as discontinued operations. To date we have had no property dispositions or assets classified as held for sale that would meet the definition of discontinued operations. If impairment indicators arise with respect to intangible assets with finite useful lives, we evaluate impairment by comparing the carrying amount of the asset to the estimated future undiscounted net cash flows expected to be generated by the asset. If estimated future undiscounted net cash flows are less than the carrying amount of the asset, then we estimate the fair value of the asset and compare the estimated fair value to the intangible asset’s carrying value. We recognize any shortfall from carrying value as an impairment loss in the current period.
Capitalization of Costs	Capitalization of Costs Direct and indirect project costs that are clearly associated with the development of properties are capitalized as incurred. Project costs include all costs directly associated with the development of a property, including construction costs, interest, property taxes, insurance, legal fees and costs of personnel working on the project. Indirect costs that do not clearly relate to the projects under development are not capitalized and are charged to expense as incurred. Capitalization of costs begins when the activities necessary to get the development project ready for its intended use begins, which include costs incurred before the beginning of construction. Capitalization of costs ceases when the development project is substantially complete and ready for its intended use. Determining when a development project commences and when it is substantially complete and ready for its intended use involves a degree of judgment. We generally consider a development project to be substantially complete and ready for its intended use upon receipt of a certificate of occupancy. If and when development of a property is suspended pursuant to a formal change in the planned use of the property, we will evaluate whether the accumulated costs exceed the estimated value of the project and write off the amount of any such excess accumulated costs. For a development project that is suspended for reasons other than a formal change in the planned use of such property, the accumulated project costs are evaluated for impairment consistent with our impairment policies for long-lived assets. During the development period, all costs including the associated land are classified to construction in progress and space held for development. Upon completion of the development period for a project, accumulated construction in progress costs including the land related to a project are allocated to the specific components of a project that are benefited. Construction in progress and space held for development includes the cost of land, the cost of construction of buildings, improvements and fixed equipment, and costs for design and engineering. Other costs, such as interest, legal, property taxes and corporate project supervision, which can be directly associated with the project during construction, are also included in construction in progress and space held for development. Land held for development includes parcels of land owned by the Company, upon which the Company intends to develop and own data centers, but has yet to commence development.
Goodwill	Goodwill Goodwill represents the excess of the purchase price over the fair value of net tangible and intangible assets acquired and tangible and intangible liabilities assumed in a business combination. Goodwill is not amortized. We perform an annual impairment test for goodwill and between annual tests, we evaluate goodwill for impairment whenever events or changes in circumstances occur that would more likely than not reduce the fair value of a reporting unit below its carrying value. In our impairment tests of goodwill, we first assess qualitative factors to determine whether it is more likely than not that the fair value of a reporting unit is less than its carrying value. If based on this assessment, we determine that the fair value of the reporting unit is not less than its carrying value, then performing the additional two-step impairment test is unnecessary. If our qualitative assessment indicates that goodwill impairment is more likely than not, we perform a two-step impairment test. We test goodwill for impairment under the two-step impairment test by first comparing the book value of net assets including goodwill to the fair value of the reporting unit. If the fair value is determined to be less than the book value of the net assets, including goodwill, a second step is performed to compute the amount of impairment as the difference between the implied fair value of goodwill and its carrying value. We estimate the fair value of the reporting unit using discounted cash flows. If the carrying value of goodwill exceeds its implied fair value, an impairment charge is recognized. We have not recognized any goodwill impairments since our inception. Since some of the goodwill is denominated in foreign currencies, changes to the goodwill balance occur over time due to changes in foreign exchange rates.
Leases	Leases We lease real estate, including corporate and regional offices, data center, and land, along with IT equipment. When we receive substantially all economic benefits from and direct use of specified property, plant and equipment, we account for those transactions as leases under ASU No. 2016-02 Leases (Topic 842). See note 2(t) for further discussion regarding the adoption of Topic 842 on January 1, 2019. We have elected the practical expedient within Topic 842 to not separate lease and non-lease components within lease transactions for all asset classes within our existing lease portfolio and, therefore, account for non-lease components combined with related lease components under Topic 842. For transactions involving leases of buildings and land, we have also elected to not separate land components from leases of specified property, plant, and equipment, as it was determined to have no effect on lease classification for any lease component, and the amounts recognized for land lease components would not have been material. Additionally, we have elected the short-term lease exception for all classes of assets, and do not apply the recognition and measurement requirements for leases of 12 months or less, and recognize lease payments for short-term leases as expense either straight-line over the lease term or as incurred depending on whether the lease payments are fixed or variable. These elections are applied consistently for all leases. When discount rates implicit in leases cannot be readily determined, we use the applicable incremental borrowing rate at lease commencement to perform lease classification tests on lease components and to measure lease liabilities and right-of-use assets. We assigned a collateralized interest rate to each lease based on the term and the currency in which each lease is denominated. To the extent there are leases in foreign countries, rates were adjusted based on local yields in those particular markets. Further, we apply the “bright-line” thresholds within Topic 840 for lease classification for all classes of assets.
Share-Based Compensation	Share-Based Compensation The Company measures all share-based compensation awards at fair value on the date they are granted to employees and directors, and recognizes compensation cost, net of forfeitures, over the requisite service period for awards with only a service condition. The estimated fair value of the long-term incentive units and Class D units (discussed in Note 14) granted by us is being amortized on a straight-line basis over the expected service period. The fair value of share-based compensation awards that contain a market condition is measured using a Monte Carlo simulation method and not adjusted based on actual achievement of the market condition.
Assets and Liabilities Measured at Fair Value	Assets and Liabilities Measured at Fair Value Fair value under U.S. GAAP is a market-based measurement, not an entity-specific measurement. Therefore, our fair value measurements are determined based on the assumptions that market participants would use in pricing the asset or liability. As a basis for considering market participant assumptions in fair-value measurements, we use a fair-value hierarchy that distinguishes between market participant assumptions based on market data obtained from sources independent of the reporting entity (observable inputs that are classified within Levels 1 and 2 of the hierarchy) and the reporting entity’s own assumptions about market participant assumptions (unobservable inputs classified within Level 3 of the hierarchy). Level 1 inputs utilize quoted prices (unadjusted) in active markets for identical assets or liabilities that the Company has the ability to access. Level 2 inputs are inputs other than quoted prices included in Level 1 that are observable for the asset or liability, either directly or indirectly. Level 2 inputs may include quoted prices for similar assets and liabilities in active markets, as well as inputs that are observable for the asset or liability (other than quoted prices), such as interest rates, foreign exchange rates, and yield curves that are observable at commonly quoted intervals. Level 3 inputs are unobservable inputs for the asset or
Derivative Instruments	Derivative Instruments Derivative financial instruments are employed to manage risks, including foreign currency and interest rate exposures and are not used for trading or speculative purposes. As part of the Company’s risk management program, a variety of financial instruments, such as interest rate swaps and foreign exchange contracts, may be used to mitigate interest rate exposure and foreign currency exposure. The Company recognizes all derivative instruments in the balance sheet at fair value. Changes in the fair value of derivatives are recognized periodically either in earnings or in stockholders’ equity as a component of accumulated other comprehensive income (loss), depending on whether the derivative financial instrument is undesignated or qualifies for hedge accounting, and if so, whether it represents a fair value, cash flow, or net investment hedge. Gains and losses on derivatives designated as cash flow hedges, to the extent they are included in the assessment of effectiveness, are recorded in other comprehensive income (loss) and subsequently reclassified to earnings to offset the impact of the hedged items when they occur. In the event it becomes probable the forecasted transaction to which a cash flow hedge relates will not occur, the derivative would be terminated and the amount in other comprehensive income (loss) would be recognized in earnings. Changes in the fair value of derivatives that are designated and qualify as a hedge of the net investment in foreign operations, to the extent they are included in the assessment of effectiveness, are reported in other comprehensive income (loss) and are deferred until disposal of the underlying assets. Gains and losses representing components excluded from the assessment of effectiveness for cash flow and fair value hedges are recognized in earnings on a straight-line basis in the same caption as the hedged item over the term of the hedge. Gains and losses representing components excluded from the assessment of effectiveness for net investment hedges are recognized in earnings on a straight-line basis over the term of the hedge. The net interest paid or received on interest rate swaps is recognized as interest expense. Gains and losses resulting from the early termination of interest rate swap agreements are deferred and amortized as adjustments to interest expense over the remaining period of the debt originally covered by the terminated swap.
Income Taxes	Income Taxes Digital Realty Trust, Inc. has elected to be treated as a real estate investment trust (a “REIT”) for federal income tax purposes. As a REIT, Digital Realty Trust, Inc. generally is not required to pay federal corporate income tax to the extent taxable income is currently distributed to its stockholders. If Digital Realty Trust, Inc. fails to qualify as a REIT in any taxable year, it will be subject to federal income tax (including any applicable alternative minimum tax for taxable years prior to 2018) on its taxable income. The Company is subject to foreign, state and local income taxes in the jurisdictions in which it conducts business. The Company’s taxable REIT subsidiaries are subject to federal, state and foreign income taxes to the extent there is taxable income. Accordingly, the Company recognizes current and deferred income taxes for its taxable REIT subsidiaries, including federal, state and non-U.S. jurisdictions, as appropriate. We assess our significant tax positions in accordance with U.S. GAAP for all open tax years and determine whether we have any material unrecognized liabilities from uncertain tax benefits. If a tax position is not considered “more-likely-than-not” to be sustained solely on its technical merits, no benefits of the tax position are to be recognized (for financial statement purposes).
Presentation of Transactional-Based Taxes	Presentation of Transactional-based Taxes We account for transactional-based taxes, such as value added tax, or VAT, for our international properties on a net basis.
Redeemable Noncontrolling Interest	Redeemable Noncontrolling Interests Redeemable noncontrolling interests include amounts related to partnership units issued by consolidated subsidiaries of the Company in which redemption for equity is outside the control of the Company. Partnership units which are determined to be contingently redeemable for cash under the Financial Accounting Standards Board’s "Distinguishing Liabilities from Equity" guidance are classified as redeemable noncontrolling interests and presented in the mezzanine section between total liabilities and stockholder’s equity on the Company’s condensed consolidated balance sheets. The amounts of consolidated net income attributable to the Company and to the noncontrolling interests are presented on the Company’s condensed consolidated income statements.
Revenue Recognition	Revenue Recognition The majority of our revenue is derived from lease arrangements, which we account for in accordance with Topic 842 commencing on January 1, 2019 and “Leases (Topic 840)” prior to 2019. We account for the non-lease components within our lease arrangements, as well as other sources of revenue, in accordance with “Revenue from Contracts with Customers (Topic 606)”. Revenue recognized as a result of applying Topic 842 and 840 was 99% and 97% and Topic 606 was less than 1% and 3% of total operating revenue for the three months ended March 31, 2019 and 2018, respectively. Our leases are classified as operating leases and minimum rents are recognized on a straight-line basis over the terms of the leases, which may span multiple years. The excess of rents recognized over amounts contractually due pursuant to the underlying leases is included in deferred rent in the accompanying condensed consolidated balance sheets and contractually due but unpaid rents are included in accounts and other receivables. Tenant reimbursements for real estate taxes, common area maintenance, and other recoverable costs under our leases are recognized in the period that the expenses are incurred. Lease termination fees are recognized over the remaining term of the lease, effective as of the date the lease modification is finalized, assuming collection is not considered doubtful. As discussed above, we recognize amortization of the value of acquired above or below-market tenant leases as a reduction of rental revenue in the case of above-market leases or an increase to rental revenue in the case of below-market leases. Interconnection services are included in rental and other services on the condensed consolidated income statements and are generally provided on a month-to-month, one-year or multi-year term. Interconnection services include port and cross-connect services. Port services are typically sold on a one-year or multi-year term and revenue is recognized on a recurring monthly basis (straight-line). The Company bills customers on a monthly basis and recognizes the revenue over the period the service is provided. Revenue for cross-connect installations is generally recognized in the period the cross-connect is installed. Interconnection services that are not specific to a particular space are accounted for under Topic 606 and have terms that are generally one year or less. Occasionally, customers engage the Company for certain services. The nature of these services historically involves property management and construction management. The proper revenue recognition of these services can be different, depending on whether the arrangements are service revenue or contractor type revenue. Service revenues are typically recognized on an equal monthly basis based on the minimum fee to be earned. The monthly amounts could be adjusted depending on if certain performance milestones are met. Fee income arises primarily from contractual management agreements with entities in which we have a noncontrolling interest. The management fees are recognized as earned under the respective agreements. Management and other fee income related to partially owned noncontrolled entities are recognized to the extent attributable to the unaffiliated interest. We make subjective estimates as to when our revenue is earned and the collectability of our accounts receivable related to minimum rent, deferred rent, expense reimbursements, lease termination fees and other income. We specifically analyze accounts receivable and historical bad debts, customer concentrations, customer creditworthiness and current economic trends when evaluating the adequacy of the allowance for bad debts. These estimates have a direct impact on our net revenue because a higher bad debt allowance would result in lower net revenue, and recognizing rental revenue as earned in one period versus another would result in higher or lower net revenue for a particular period.
Transaction and Integration Expense	Transaction and Integration Expense Transaction and integration expense includes business combination expenses, other business development expenses and other expenses to integrate newly acquired investments, which are expensed as incurred. Transaction expenses include closing costs, broker commissions and other professional fees, including legal and accounting fees related to business combinations or acquisitions that were not consummated. Integration costs include transition costs associated with organizational restructuring (such as severance and retention payments and recruiting expenses), third-party consulting expenses directly related to the integration of acquired companies (in areas such as cost savings and synergy realization, technology and systems work), and internal costs such as training, travel and labor, reflecting time spent by Company personnel on integration activities and projects. Recurring costs are recorded in general and administrative expense.
Gain on Sale of Properties	Gain on Sale of Properties We account for the sale of real estate properties under Financial Accounting Standards Board, or FASB, Accounting Standards Update, or ASU, No. 2017-05, Other Income—Gains and Losses from the Derecognition of Nonfinancial Assets (Subtopic 610-20), which provides for revenue recognition based on transfer of ownership. During the three months ended March 31, 2018, the Company sold real estate properties for gross proceeds of $139.3 million , and a recorded net gain of $39.4 million .
Gain On Deconsolidation	Gain on Deconsolidation We deconsolidate our subsidiaries in accordance with ASC 810, Consolidation, as of the date we cease to have a controlling financial interest in our subsidiaries. We account for the deconsolidation of our subsidiaries by recognizing a gain or loss in accordance with ASC 810. This gain or loss is measured at the date our subsidiaries are deconsolidated as the difference between (a) the aggregate of the fair value of any consideration received, the fair value of any retained non-controlling interest in our subsidiaries being deconsolidated, and the carrying amount of any non-controlling interest in our subsidiaries being deconsolidated, including any accumulated other comprehensive income/loss attributable to the non-controlling interest, and (b) the carrying amount of the assets and liabilities of our subsidiaries being deconsolidated.
Management's Estimates	Management’s Estimates The preparation of financial statements in conformity with U.S. GAAP requires management to make estimates and assumptions that affect the reported amounts of assets and liabilities and disclosure of contingent assets and liabilities at the date of the consolidated financial statements and the reported amounts of revenues and expenses during the reporting period. Actual results could differ from those estimates made. On an on-going basis, we evaluate our estimates, including those related to the valuation of our real estate properties, tenant relationship value, goodwill, contingent consideration, accounts receivable and deferred rent receivable, performance-based equity compensation plans and the completeness of accrued liabilities. We base our estimates on historical experience, current market conditions, and various other assumptions that are believed to be reasonable under the circumstances. Actual results may vary from those estimates and those estimates could vary under different assumptions or conditions.
Segment and Geographic Information	Segment and Geographic Information The Company is managed on a consolidated basis based on customer demand considerations. Deployment of capital is geared to satisfy this demand. In this regard, the sale and delivery of our products is consistent throughout the portfolio. Services are provided to customers typical of the data center industry. Rent and the cost of services are billed and collected. The Company has one operating segment and therefore one reporting segment.
New Accounting Pronouncements	New Accounting Pronouncements New Accounting Standards Adopted In February 2016, the FASB issued ASU No. 2016-02 Leases (Topic 842). The standard introduces new requirements to increase transparency and comparability among organizations for leasing transactions for both lessees and lessors. Topic 842 requires a lessee to record a right-of-use asset and a lease liability for all leases with terms longer than 12 months. These leases will be either finance or operating, with classification affecting the pattern of expense recognition. We adopted Topic 842 , on January 1, 2019 and elected to apply the modified retrospective transition method prospectively from the effective date of adoption. As part of applying the transition method, we elected to apply the package of transition practical expedients within the new guidance. As required by the new standard, these expedients have been elected as a package, and consistently applied across our lease portfolio. Accordingly, we need not reassess the following: ◦ Whether any expired or existing contracts are or contain leases ◦ The lease classification for any expired or existing leases ◦ Treatment of initial direct costs relating to any existing leases We have decided not to elect the transition practical expedient to use hindsight in determining lease term and in assessing impairment of right-of-use assets. In applying the modified retrospective transition method to operating leases, we measured lease liabilities at the present value of the sum of remaining minimum rental payments (as defined under Topic 840) as the leases contained no residual value guarantees. These lease liabilities have been measured using our incremental borrowing rates as of the date of adoption. Additionally, right-of-use assets for these operating leases have been measured as the initial measurement of applicable lease liabilities adjusted for other related lease balances at transition. In applying the modified retrospective transition method to capital leases, at the effective date, we measured lease liabilities and right of use assets at the carrying amount of capital lease obligations and capital lease assets under Topic 840, respectively. In addition, we applied the modified retrospective transition method to build-to-suit leases for which assets and liabilities have been recognized solely as a result of the transactions’ build-to-suit designation in accordance with Topic 840. Therefore, we derecognized those assets and liabilities at the effective date of adoption for build-to-suit leases where construction had completed, with the difference of approximately $6.3 million recorded as an increase to accumulated dividends in excess of earnings at the adoption date. We accounted for the leases therefrom, following lessee transition guidance. New Accounting Standards Issued but not yet Adopted In August 2018, the FASB issued ASU No. 2018-13, “Fair Value Measurement (Topic 820): Disclosure Framework-Changes to the Disclosure Requirements for Fair Value Measurement.” This ASU amends existing fair value measurement disclosure requirements by adding, changing, or removing certain disclosures. ASU No. 2018-13 will be effective for us as of January 1, 2020, and earlier adoption is permitted. We are currently reviewing the impact this ASU will have on our financial statements. We determined that all other recently issued accounting pronouncements will not have a material impact on our consolidated financial statements or do not apply to our operations.

Organization and Description _2

Organization and Description of Business (Tables)	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Schedule of Real Estate Properties	A summary of our data center portfolio as of March 31, 2019 and December 31, 2018 is as follows: Data Centers As of March 31, 2019 As of December 31, 2018 Region Operating Unconsolidated Joint Ventures Total Operating Unconsolidated Joint Ventures Total United States 131 14 145 131 14 145 Europe 38 — 38 38 — 38 Latin America — 17 17 16 — 16 Asia 3 4 7 3 4 7 Australia 5 — 5 5 — 5 Canada 3 — 3 3 — 3 Total 180 35 215 196 18 214

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Capitalized Contract Cost	We have reclassified certain items in the December 31, 2018 condensed consolidated balance sheet to conform to the current presentation as follows (in thousands): December 31, 2018 As Previously Reported Adjustments As Revised Land $ 1,509,764 $ (650,651 ) $ 859,113 Building and improvements 16,745,210 (1,134,218 ) 15,610,992 Construction in progress and space held for development — 1,621,928 1,621,928 Land held for future development — 162,941 162,941
Schedule of Goodwill	The following is a summary of goodwill activity for the three months ended March 31, 2019 (in thousands): Balance as of December 31, 2018 Deconsolidation Goodwill Adjustments (1) Impact of Change in Foreign Exchange Rates Balance as of March 31, 2019 Merger / Portfolio Acquisition Telx Acquisition $ 330,845 $ — $ — $ — $ 330,845 European Portfolio Acquisition 442,349 — (9,436 ) 2,559 435,472 DFT Merger 2,592,146 — — — 2,592,146 Ascenty Acquisition 982,667 (982,667 ) — — — Total $ 4,348,007 $ (982,667 ) $ (9,436 ) $ 2,559 $ 3,358,463 (1) As a result of a subsequent change to an acquired deferred tax liability that would not have impacted consideration paid, goodwill was adjusted.

Real Estate (Tables)

Real Estate (Tables)	3 Months Ended
	Mar. 31, 2019
Real Estate [Abstract]
Schedule of Properties Acquired	We acquired the following real estate during the three months ended March 31, 2019 : Location Market Date Acquired Amount (in millions) Dulles World Park (1) Northern Virginia Feb 25, 2019 $ 9.0 (1) Represents currently vacant land which is not included in our operating property count. Purchase price excludes capitalized closing costs.

Investments in Unconsolidated_2

Investments in Unconsolidated Joint Ventures (Tables)	3 Months Ended
	Mar. 31, 2019
Equity Method Investments and Joint Ventures [Abstract]
Summary of Financial Information for Joint Ventures	As of March 31, 2019 and December 31, 2018 , our investments in unconsolidated joint ventures accounted for under the equity method of accounting presented in our condensed consolidated balance sheets consist of the following (in thousands): Joint Venture Metropolitan Area % Ownership March 31, 2019 December 31, 2018 Ascenty (1) Brazil / Chile 51% (2) $ 743,083 $ — Chun Choi Hong Kong 50% 96,988 96,094 Digital MC Osaka / Tokyo 50% 77,845 66,835 Other 12,410 12,179 Total $ 930,326 $ 175,108 (1) Our maximum exposure to loss related to this unconsolidated variable interest entity (VIE) is limited to our equity investment in this VIE. (2) Includes an approximate 2% ownership interest by a non-controlling interest in our entity that holds the investment in the Ascenty joint venture, which has a carrying value of approximately $25.0 million .

Leases (Tables)

Leases (Tables)	3 Months Ended	12 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Leases [Abstract]
Supplemental Balance Sheet Information	Supplemental balance sheet information related to leases as of March 31, 2019 was as follows (in thousands): Balance Sheet Classification Balance as of March 31, 2019 Assets: Operating lease assets Operating lease right-of-use assets $ 660,586 Finance lease assets Buildings and improvements 124,371 Total leased assets $ 784,957 Liabilities: Operating lease liabilities Operating lease liabilities $ 725,470 Finance lease liabilities Accounts payable and other accrued liabilities 167,764 Total lease liabilities $ 893,234
Lease, Cost	The components of lease expense for the three months ended March 31, 2019 were as follows (in thousands): Lease cost Income Statement Classification Three Months Ended March 31, 2019 Finance lease cost: Amortization of right-of-use assets Depreciation and amortization $ 1,227 Interest on lease liabilities Interest expense 1,646 Operating lease cost Rental property operating and maintenance 23,114 Total lease cost $ 25,987
Schedule of Future Minimum Rental Payments for Operating Leases		The minimum commitment under operating leases, excluding fully prepaid ground leases, as of December 31, 2018 was as follows (in thousands): 2019 $ 84,712 2020 87,396 2021 86,212 2022 81,976 2023 80,707 Thereafter 539,047 Total $ 960,050
Schedule of Future Minimum Lease Payments for Capital Leases	Future minimum lease payments and their present value for property under capital lease obligations as of December 31, 2018, are as follows (in thousands): 2019 $ 11,657 2020 13,108 2021 13,207 2022 13,706 2023 14,219 Thereafter 285,774 351,671 Less amount representing interest (137,827 ) Present value $ 213,844
Finance Leases Maturity	Maturities of lease liabilities as of March 31, 2019 were as follows (in thousands): Operating lease liabilities Finance lease liabilities Remainder of 2019 $ 62,313 $ 5,351 2020 84,415 8,823 2021 83,181 8,868 2022 79,187 9,332 2023 78,382 9,788 Thereafter 548,011 234,658 Total undiscounted future cash flows 935,489 276,820 Less: Imputed interest (210,019 ) (109,056 ) Present value of undiscounted future cash flows $ 725,470 $ 167,764
Operating Lease Maturity	Maturities of lease liabilities as of March 31, 2019 were as follows (in thousands): Operating lease liabilities Finance lease liabilities Remainder of 2019 $ 62,313 $ 5,351 2020 84,415 8,823 2021 83,181 8,868 2022 79,187 9,332 2023 78,382 9,788 Thereafter 548,011 234,658 Total undiscounted future cash flows 935,489 276,820 Less: Imputed interest (210,019 ) (109,056 ) Present value of undiscounted future cash flows $ 725,470 $ 167,764
Lessor Operating Minimum Lease Payments	The following table summarizes the minimum lease payments due from our customers on leases with lease periods greater than one year for space in our operating properties, prestabilized development properties and leases of land subject to ground leases at March 31, 2019 (in thousands): Operating leases Remainder of 2019 $ 1,761,276 2020 1,949,524 2021 1,714,577 2022 1,411,271 2023 1,211,576 Thereafter 4,400,329 Total $ 12,448,553

Acquired Intangible Assets an_2

Acquired Intangible Assets and Liabilities (Tables)	3 Months Ended
	Mar. 31, 2019
Acquired Intangible Assets And Liabilities [Abstract]
Summary of Acquired Intangible Assets	The following summarizes our acquired intangible assets (real estate intangibles, comprised of acquired in-place lease value and tenant relationship value along with acquired above-market lease value) and intangible liabilities (acquired below-market lease value) as of March 31, 2019 and December 31, 2018 . Balance as of (Amounts in thousands) March 31, 2019 December 31, 2018 Real Estate Intangibles: Acquired in-place lease value: Gross amount (1) $ 1,450,914 $ 1,569,401 Accumulated amortization (840,778 ) (795,033 ) Net $ 610,136 $ 774,368 Tenant relationship value: Gross amount (1) $ 1,966,006 $ 2,339,606 Accumulated amortization (322,791 ) (291,818 ) Net $ 1,643,215 $ 2,047,788 Acquired above-market leases: Gross amount $ 278,592 $ 277,796 Accumulated amortization (172,548 ) (158,037 ) Net $ 106,044 $ 119,759 Acquired below-market leases: Gross amount $ 442,936 $ 442,535 Accumulated amortization (250,269 ) (242,422 ) Net $ 192,667 $ 200,113 (1) In connection with the deconsolidation of Ascenty, $120.0 million of acquired in-place lease value and $375.0 million of tenant relationship value were written off during the three months ended March 31, 2019 .
Schedule of Estimated Annual Amortization of Below Market Leases	Estimated annual amortization of acquired below-market leases, net of acquired above-market leases, for each of the five succeeding years and thereafter, commencing April 1, 2019 is as follows: (Amounts in thousands) Remainder of 2019 $ (9,150 ) 2020 (3,912 ) 2021 889 2022 7,923 2023 12,070 Thereafter 78,803 Total $ 86,623
Schedule of Estimated Annual Amortization of Acquired of Intangible Assets	Estimated annual amortization of acquired in-place lease value for each of the five succeeding years and thereafter, commencing April 1, 2019 is as follows: (Amounts in thousands) Remainder of 2019 $ 101,543 2020 111,585 2021 87,036 2022 65,153 2023 53,596 Thereafter 191,223 Total $ 610,136 Estimated annual amortization of tenant relationship value for each of the five succeeding years and thereafter, commencing April 1, 2019 is as follows: (Amounts in thousands) Remainder of 2019 $ 92,301 2020 123,069 2021 123,069 2022 123,069 2023 123,069 Thereafter 1,058,638 Total $ 1,643,215

Debt of the Operating Partner_2

Debt of the Operating Partnership (Tables) - Digital Realty Trust, L.P.	3 Months Ended
	Mar. 31, 2019
Debt Instrument [Line Items]
Summary of Outstanding Indebtedness of the Operating Partnership	A summary of outstanding indebtedness of the Operating Partnership as of March 31, 2019 and December 31, 2018 is as follows (in thousands): Indebtedness Interest Rate at March 31, 2019 Maturity Date Principal Outstanding at March 31, 2019 Principal Outstanding at December 31, 2018 Global revolving credit facilities Various (1)(4) Jan 24, 2023 (1) $ 857,211 (2) $ 1,663,156 (2) Deferred financing costs, net (14,236 ) (15,421 ) Global revolving credit facilities, net 842,975 1,647,735 Unsecured Term Loans 2019 Term Loan Base Rate + 1.000% Jan 19, 2019 — 375,000 2023 Term Loan Various (3)(4) Jan 15, 2023 300,000 (5) 300,000 (5) 2024 Term Loan Various (3)(4) Jan 24, 2023 (3) 511,654 (5) 508,120 (5) Deferred financing costs, net (3,928 ) (4,216 ) Unsecured term loans, net 807,726 1,178,904 Floating rate notes due 2019 EURIBOR + 0.500% May 22, 2019 140,225 (6) 143,338 (6) 5.875% notes due 2020 5.875% Feb 1, 2020 — (8) 500,000 3.400% notes due 2020 3.400% Oct 1, 2020 500,000 500,000 5.250% notes due 2021 5.250% Mar 15, 2021 400,000 400,000 3.950% notes due 2022 3.950% Jul 1, 2022 500,000 500,000 3.625% notes due 2022 3.625% Oct 1, 2022 300,000 300,000 2.750% notes due 2023 2.750% Feb 1, 2023 350,000 350,000 4.750% notes due 2023 4.750% Oct 13, 2023 391,050 (7) 382,620 (7) 2.625% notes due 2024 2.625% Apr 15, 2024 673,080 (6) 688,020 (6) 2.750% notes due 2024 2.750% Jul 19, 2024 325,875 (7) 318,850 (7) 4.250% notes due 2025 4.250% Jan 17, 2025 521,400 (7) 510,160 (7) 4.750% notes due 2025 4.750% Oct 1, 2025 450,000 450,000 2.500% notes due 2026 2.500% Jan 16, 2026 1,205,935 (6) — 3.700% notes due 2027 3.700% Aug 15, 2027 1,000,000 1,000,000 4.450% notes due 2028 4.450% Jul 15, 2028 650,000 650,000 3.300% notes due 2029 3.300% Jul 19, 2029 456,225 (7) 446,390 (7) 3.750% notes due 2030 3.750% Oct 17, 2030 $ 716,925 (7)(9) $ 510,160 (7) Unamortized discounts, net of premiums (11,520 ) (19,859 ) Total senior notes, net of discount 8,569,195 7,629,679 Deferred financing costs, net (45,733 ) (40,553 ) Total unsecured senior notes, net of discount and deferred financing costs 8,523,462 7,589,126 Indebtedness Interest Rate at March 31, 2019 Maturity Date Principal Outstanding March 31, 2019 Principal Outstanding December 31, 2018 Secured Debt: 731 East Trade Street 8.22% Jul 1, 2020 $ 1,621 $ 1,776 Secured note due March 2023 LIBOR + 1.100% (4) Mar 1, 2023 104,000 104,000 Secured note due December 2023 Base Rate + 4.250% Dec 20, 2023 — (10) 600,000 Unamortized net premiums 124 148 Total mortgage loans, including premiums 105,745 705,924 Deferred financing costs, net (252 ) (20,210 ) Total secured debt, including premiums and net of deferred financing costs 105,493 685,714 Total indebtedness $ 10,279,656 $ 11,101,479 _________________________________ (1) The interest rate for borrowings under the global revolving credit facility equals the applicable index plus a margin of 90 basis points, which is based on the current credit rating of our long-term debt. An annual facility fee of 20 basis points, which is based on the credit rating of our long-term debt, is due and payable quarterly on the total commitment amount of the facility. Two six -month extensions are available, which we may exercise if certain conditions are met. The interest rate for borrowings under the Yen revolving credit facility equals the applicable index plus a margin of 50 basis points, which is based on the current credit rating of our long-term debt. (2) Balances as of March 31, 2019 and December 31, 2018 are as follows (balances, in thousands): Denomination of Draw Balance as of March 31, 2019 Weighted-average interest rate Balance as of December 31, 2018 Weighted-average interest rate Floating Rate Borrowing (a)(d) U.S. dollar ($) $ 290,000 3.39 % $ 890,000 3.37 % British pound sterling (£) — — % 8,290 (c) 1.61 % Euro (€) 203,046 (b) 0.90 % 451,800 (c) 0.90 % Australian dollar (AUD) 31,648 (b) 2.74 % 27,632 (c) 2.82 % Hong Kong dollar (HKD) 10,051 (b) 2.43 % 8,797 (c) 3.14 % Japanese yen (JPY) 4,059 (b) 0.90 % 4,105 (c) 0.90 % Singapore dollar (SGD) 77,680 (b) 2.83 % 77,112 (c) 2.79 % Canadian dollar (CAD) 67,794 (b) 2.81 % 60,856 (c) 3.16 % Total $ 684,278 2.47 % $ 1,528,592 2.57 % Yen Revolving Credit Facility $ 172,933 (b) 0.50 % $ 134,564 (c) 0.50 % Total borrowings $ 857,211 2.07 % $ 1,663,156 2.41 % (a) The interest rates for floating rate borrowings under the global revolving credit facility currently equal the applicable index plus a margin of 90 basis points, which is based on the credit rating of our long-term debt. (b) Based on exchange rates of $1.12 to €1.00, $0.71 to 1.00 AUD, $0.13 to 1.00 HKD, $0.01 to 1.00 JPY, $0.74 to 1.00 SGD and $0.75 to 1.00 CAD, respectively, as of March 31, 2019 . (c) Based on exchange rates of $1.28 to £1.00, $1.15 to €1.00, $0.70 to 1.00 AUD, $0.13 to 1.00 HKD, $0.01 to 1.00 JPY, $0.73 to 1.00 SGD and $0.73 to 1.00 CAD, respectively, as of December 31, 2018 . (d) As of March 31, 2019 , approximately $45.0 million of letters of credit were issued. (3) Interest rates are based on our current senior unsecured debt ratings and is currently 100 basis points over the applicable index for floating rate advances for the 2023 Term Loan and the 2024 Term Loan. Two six -month extensions are available for the 2024 Term Loan, which we may exercise if certain conditions are met. (4) We have entered into interest rate swap agreements as a cash flow hedge for interest generated by the U.S. dollar and Canadian dollar borrowings under the global revolving credit facility, the 2023 Term Loan and 2024 Term Loan and the secured note due March 2023. See Note 15 "Derivative Instruments" for further information. (5) Balances as of March 31, 2019 and December 31, 2018 are as follows (balances, in thousands): Denomination of Draw Balance as of March 31, 2019 Weighted-average interest rate Balance as of December 31, 2018 Weighted-average interest rate U.S. dollar ($) $ 300,000 3.48 % (b) $ 300,000 3.46 % (d) Singapore dollar (SGD) 146,876 (a) 2.80 % 146,080 (c) 2.76 % Australian dollar (AUD) 205,997 (a) 2.85 % 204,632 (c) 2.94 % Hong Kong dollar (HKD) 84,995 (a) 2.55 % 85,188 (c) 3.32 % Canadian dollar (CAD) 73,786 (a) 2.98 % (b) 72,220 (c) 3.24 % (d) Total $ 811,654 3.05 % (b) $ 808,120 3.17 % (d) (a) Based on exchange rates of $0.74 to 1.00 SGD, $0.71 to 1.00 AUD, $0.13 to 1.00 HKD and $0.75 to 1.00 CAD, respectively, as of March 31, 2019 . (b) As of March 31, 2019 , the weighted-average interest rate reflecting interest rate swaps was 2.44% (U.S. dollar), 1.78% (Canadian dollar) and 2.56% (Total). See Note 15 "Derivative Instruments" for further discussion on interest rate swaps. (c) Based on exchange rates of $0.73 to 1.00 SGD, $0.70 to 1.00 AUD, $0.13 to 1.00 HKD and $0.73 to 1.00 CAD, respectively, as of December 31, 2018 . (d) As of December 31, 2018 , the weighted-average interest rate reflecting interest rate swaps was 2.44% (U.S. dollar), 1.78% (Canadian dollar) and 2.66% (Total). (6) Based on exchange rates of $1.12 to €1.00 as of March 31, 2019 and $1.15 to €1.00 as of December 31, 2018 . (7) Based on exchange rates of $1.30 to £1.00 as of March 31, 2019 and $1.28 to £1.00 as of December 31, 2018 . (8) The 5.875% 2020 Notes were paid in full in January 2019 (by tender offer) and February 2019 (by redemption of remaining balance after the tender offer). The tender offer and redemption resulted in an early extinguishment charge of approximately $12.9 million during the three months ended March 31, 2019 . (9) On March 5, 2019, Digital Stout Holding, LLC, a wholly owned subsidiary of the Operating Partnership, issued and sold an additional £150.0 million aggregate principal amount of 2030 Notes. The terms of the 2030 Notes are governed by an indenture, dated as of October 17, 2018, among Digital Stout Holding, LLC, Digital Realty Trust, Inc., the Operating Partnership, Deutsche Trustee Company Limited, as trustee, Deutsche Bank AG, London Branch, as paying agent and a transfer agent, and Deutsche Bank Luxembourg S.A., as registrar and a transfer agent (the “GBP Notes Indenture”), pursuant to which Digital Stout Holding, LLC previously issued £400.0 million in aggregate principal amount of its 2030 Notes. The 2030 Notes will be treated as a single series with the notes previously issued under such GBP Notes Indenture. (10) The debt was deconsolidated as a result of the Ascenty joint venture formed with Brookfield.
Schedule of Debt Maturities and Principal Maturities	The table below summarizes our debt maturities and principal payments as of March 31, 2019 (in thousands): Global Revolving (1) Unsecured (1) Senior Notes Secured Debt Total Debt Remainder of 2019 $ — $ — $ 140,225 $ 488 $ 140,713 2020 — — 500,000 1,133 501,133 2021 — — 400,000 — 400,000 2022 — — 800,000 — 800,000 2023 684,278 811,654 741,050 104,000 2,340,982 Thereafter 172,933 — 5,999,440 — 6,172,373 Subtotal $ 857,211 $ 811,654 $ 8,580,715 $ 105,621 $ 10,355,201 Unamortized discount — — (18,584 ) — (18,584 ) Unamortized premium — — 7,064 124 7,188 Total $ 857,211 $ 811,654 $ 8,569,195 $ 105,745 $ 10,343,805 (1) The global revolving credit facility and 2024 Term Loan are subject to two six -month extension options exercisable by us. The bank group is obligated to grant the extension options provided we give proper notice, we make certain representations and warranties and no default exists under the global revolving credit facility.

Income per Share (Tables)

Income per Share (Tables)	3 Months Ended
	Mar. 31, 2019
Earnings Per Share [Abstract]
Summary of Basic and Diluted Earnings Per Share	The following is a summary of basic and diluted income per share (in thousands, except share and per share amounts): Three Months Ended March 31, 2019 2018 Net income available to common stockholders $ 95,869 $ 86,298 Weighted average shares outstanding—basic 207,809,383 205,714,173 Potentially dilutive common shares: Unvested incentive units 323,064 302,016 Forward equity offering 221,448 — Market performance-based awards 172,354 491,287 Weighted average shares outstanding—diluted 208,526,249 206,507,476 Income per share: Basic $ 0.46 $ 0.42 Diluted $ 0.46 $ 0.42
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	We have excluded the following potentially dilutive securities in the calculations above as they would be antidilutive or not dilutive: Three Months Ended March 31, 2019 2018 Weighted average of Operating Partnership common units not owned by Digital Realty Trust, Inc. 9,229,911 8,295,287 Potentially dilutive Series C Cumulative Redeemable Perpetual Preferred Stock 1,738,781 1,967,430 Potentially dilutive Series G Cumulative Redeemable Preferred Stock 2,155,992 2,439,505 Potentially dilutive Series H Cumulative Redeemable Preferred Stock 3,159,382 3,574,840 Potentially dilutive Series I Cumulative Redeemable Preferred Stock 2,158,515 2,442,359 Potentially dilutive Series J Cumulative Redeemable Preferred Stock 1,722,138 1,948,598 Potentially dilutive Series K Cumulative Redeemable Preferred Stock 358,008 — Total 20,522,727 20,668,019

Income per Unit (Tables)

Income per Unit (Tables)	3 Months Ended
	Mar. 31, 2019
Class of Stock [Line Items]
Summary of Basic and Diluted Earnings Per Share	The following is a summary of basic and diluted income per share (in thousands, except share and per share amounts): Three Months Ended March 31, 2019 2018 Net income available to common stockholders $ 95,869 $ 86,298 Weighted average shares outstanding—basic 207,809,383 205,714,173 Potentially dilutive common shares: Unvested incentive units 323,064 302,016 Forward equity offering 221,448 — Market performance-based awards 172,354 491,287 Weighted average shares outstanding—diluted 208,526,249 206,507,476 Income per share: Basic $ 0.46 $ 0.42 Diluted $ 0.46 $ 0.42
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	We have excluded the following potentially dilutive securities in the calculations above as they would be antidilutive or not dilutive: Three Months Ended March 31, 2019 2018 Weighted average of Operating Partnership common units not owned by Digital Realty Trust, Inc. 9,229,911 8,295,287 Potentially dilutive Series C Cumulative Redeemable Perpetual Preferred Stock 1,738,781 1,967,430 Potentially dilutive Series G Cumulative Redeemable Preferred Stock 2,155,992 2,439,505 Potentially dilutive Series H Cumulative Redeemable Preferred Stock 3,159,382 3,574,840 Potentially dilutive Series I Cumulative Redeemable Preferred Stock 2,158,515 2,442,359 Potentially dilutive Series J Cumulative Redeemable Preferred Stock 1,722,138 1,948,598 Potentially dilutive Series K Cumulative Redeemable Preferred Stock 358,008 — Total 20,522,727 20,668,019
Digital Realty Trust, L.P.
Class of Stock [Line Items]
Summary of Basic and Diluted Earnings Per Share	The following is a summary of basic and diluted income per unit (in thousands, except unit and per unit amounts): Three Months Ended March 31, 2019 2018 Net income available to common unitholders $ 100,169 $ 89,778 Weighted average units outstanding—basic 217,039,295 214,009,460 Potentially dilutive common units: Unvested incentive units 323,064 302,016 Forward equity offering 221,448 — Market performance-based awards 172,354 491,287 Weighted average units outstanding—diluted 217,756,161 214,802,763 Income per unit: Basic $ 0.46 $ 0.42 Diluted $ 0.46 $ 0.42
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share	We have excluded the following potentially dilutive securities in the calculations above as they would be antidilutive or not dilutive: Three Months Ended March 31, 2019 2018 Potentially dilutive Series C Cumulative Redeemable Perpetual Preferred Units 1,738,781 1,967,430 Potentially dilutive Series G Cumulative Redeemable Preferred Units 2,155,992 2,439,505 Potentially dilutive Series H Cumulative Redeemable Preferred Units 3,159,382 3,574,840 Potentially dilutive Series I Cumulative Redeemable Preferred Units 2,158,515 2,442,359 Potentially dilutive Series J Cumulative Redeemable Preferred Units 1,722,138 1,948,598 Potentially dilutive Series K Cumulative Redeemable Preferred Units 358,008 — Total 11,292,816 12,372,732

Equity and Accumulated Other _2

Equity and Accumulated Other Comprehensive Loss, Net (Tables)	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Ownership Interest In The Operating Partnership	The following table shows the ownership interests in the Operating Partnership as of March 31, 2019 and December 31, 2018 : March 31, 2019 December 31, 2018 Number of units Percentage of total Number of units Percentage of total Digital Realty Trust, Inc. 208,214,139 95.6 % 206,425,656 95.1 % Noncontrolling interests consist of: Common units held by third parties 4,858,794 2.2 % 6,297,272 2.9 % Issuance of units in connection with Ascenty Acquisition 2,338,874 1.1 % 2,338,874 1.1 % Incentive units held by employees and directors (see Note 13) 2,275,791 1.1 % 1,944,738 0.9 % 217,687,598 100.0 % 217,006,540 100.0 %
Summary of Activity for Noncontrolling Interests in the Operating Partnership	The following table shows activity for the noncontrolling interests in the Operating Partnership for the three months ended March 31, 2019 : Common Units Incentive Units Total As of December 31, 2018 8,636,146 1,944,738 10,580,884 Redemption of common units for shares of Digital Realty Trust, Inc. common stock (1) (1,438,478 ) — (1,438,478 ) Conversion of incentive units held by employees and directors for shares of Digital Realty Trust, Inc. common stock (1) — (79,398 ) (79,398 ) Incentive units issued upon achievement of market performance condition — 308,308 308,308 Grant of incentive units to employees and directors — 105,843 105,843 Cancellation / forfeitures of incentive units held by employees and directors — (3,700 ) (3,700 ) As of March 31, 2019 7,197,668 2,275,791 9,473,459 (1) Redemption / conversion of common units was recorded as a reduction to noncontrolling interests in the Operating Partnership and an increase to common stock and additional paid in capital based on the book value per unit in the accompanying condensed consolidated balance sheet of Digital Realty Trust, Inc.
Schedule of Dividends	We have declared and paid the following dividends on our common and preferred stock for the three months ended March 31, 2019 (in thousands, except per share data): Date dividend declared Dividend Series C Preferred Stock Series G Preferred Stock Series H Preferred Stock Series I Preferred Stock Series J Preferred Stock Common February 21, 2019 March 29, 2019 $ 3,333 $ 3,672 $ 6,730 $ 3,969 $ 2,625 $ 224,802 Annual rate of dividend per share $ 1.65625 $ 1.46875 $ 1.84375 $ 1.58750 $ 1.31250 $ 4.32000
Schedule of Accumulated Other Comprehensive Income, Net	The accumulated balances for each item within other comprehensive income (loss), net are as follows (in thousands): Foreign currency Cash flow hedge Foreign currency net investment hedge adjustments Accumulated other Balance as of December 31, 2018 $ (158,649 ) $ 17,264 $ 25,738 $ (115,647 ) Net current period change 7,880 (3,614 ) — 4,266 Reclassification of foreign currency translation 21,687 — — 21,687 Reclassification to interest expense from interest — (2,005 ) — (2,005 ) Balance as of March 31, 2019 $ (129,082 ) $ 11,645 $ 25,738 $ (91,699 )

Capital and Accumulated Other_2

Capital and Accumulated Other Comprehensive Loss (Tables)	3 Months Ended
	Mar. 31, 2019
Class of Stock [Line Items]
Schedule of Distributions	We have declared and paid the following dividends on our common and preferred stock for the three months ended March 31, 2019 (in thousands, except per share data): Date dividend declared Dividend Series C Preferred Stock Series G Preferred Stock Series H Preferred Stock Series I Preferred Stock Series J Preferred Stock Common February 21, 2019 March 29, 2019 $ 3,333 $ 3,672 $ 6,730 $ 3,969 $ 2,625 $ 224,802 Annual rate of dividend per share $ 1.65625 $ 1.46875 $ 1.84375 $ 1.58750 $ 1.31250 $ 4.32000
Schedule of Accumulated Other Comprehensive Income, Net	The accumulated balances for each item within other comprehensive income (loss), net are as follows (in thousands): Foreign currency Cash flow hedge Foreign currency net investment hedge adjustments Accumulated other Balance as of December 31, 2018 $ (158,649 ) $ 17,264 $ 25,738 $ (115,647 ) Net current period change 7,880 (3,614 ) — 4,266 Reclassification of foreign currency translation 21,687 — — 21,687 Reclassification to interest expense from interest — (2,005 ) — (2,005 ) Balance as of March 31, 2019 $ (129,082 ) $ 11,645 $ 25,738 $ (91,699 )
Digital Realty Trust, L.P.
Class of Stock [Line Items]
Schedule of Distributions	The Operating Partnership has declared and paid the following distributions on its common and preferred units for the three months ended March 31, 2019 (in thousands, except for per unit data): Date distribution declared Distribution Series C Preferred Units Series G Preferred Units Series H Preferred Units Series I Preferred Units Series J Preferred Units Common February 21, 2019 March 29, 2019 $ 3,333 $ 3,672 $ 6,730 $ 3,969 $ 2,625 $ 235,256 Annual rate of distribution per unit $ 1.65625 $ 1.46875 $ 1.84375 $ 1.58750 $ 1.31250 $ 4.32000
Schedule of Accumulated Other Comprehensive Income, Net	The accumulated balances for each item within other comprehensive income are as follows (in thousands): Foreign currency Cash flow hedge Foreign currency net investment hedge adjustments Accumulated other Balance as of December 31, 2018 $ (163,531 ) $ 16,986 $ 26,152 $ (120,393 ) Net current period change 9,193 (3,775 ) — 5,418 Reclassification of foreign currency translation 21,687 — — 21,687 Reclassification to interest expense from interest rate swaps — (2,094 ) — (2,094 ) Balance as of March 31, 2019 $ (132,651 ) $ 11,117 $ 26,152 $ (95,382 )

Incentive Plan (Tables)

Incentive Plan (Tables)	3 Months Ended
	Mar. 31, 2019
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
Schedule of Deferred Compensation	Below is a summary of our compensation expense for the three months ended March 31, 2019 and 2018 and our unearned compensation as of March 31, 2019 and December 31, 2018 (in millions): Deferred Compensation Unearned Compensation Expected period to recognize unearned compensation (in years) Expensed Capitalized As of March 31, 2019 As of December 31, 2018 Three Months Ended March 31, Type of incentive award 2019 2018 2019 2018 Long-term incentive units $ 1.4 $ 0.9 $ — $ 0.2 $ 21.9 $ 11.5 2.9 Market performance-based awards 3.1 3.1 0.2 0.3 40.7 24.8 2.6 Restricted stock 2.6 1.5 0.6 1.1 39.8 23.6 3.2
Summary of Long-Term Incentive Unit Activity	Below is a summary of our long-term incentive unit activity for the three months ended March 31, 2019 . Unvested Long-term Incentive Units Units Weighted-Average Grant Date Fair Value Unvested, beginning of period 158,486 $ 100.94 Granted 105,135 116.07 Vested (50,201 ) 81.47 Unvested, end of period 213,420 $ 98.10
Market Performance Based Awards	In the event that the RMS Relative Market Performance during the Market Performance Period is achieved at the “threshold,” “target” or “high” level as set forth below, the awards will become vested as to the market condition with respect to the percentage of Class D units or RSUs, as applicable, set forth below: Level RMS Relative Market Performance Vesting Percentage Below Threshold Level ≤ -300 basis points 0% Threshold Level -300 basis points 25% Target Level 100 basis points 50% High Level > 500 basis points 100%
Schedule Of Valuation Assumptions	Assumptions used in the valuations are summarized as follows: Award Date Expected Stock Price Volatility Risk-Free Interest rate January 1, 2018 22% 1.98% March 1, 2018 22% 2.34% March 9, 2018 22% 2.42% January 1, 2019 23% 2.44% February 21, 2019 23% 2.48%
Summary of Restricted Stock Activity	Below is a summary of our restricted stock activity for the three months ended March 31, 2019 . Unvested Restricted Stock Shares Weighted-Average Grant Date Fair Value Unvested, beginning of period 295,501 $ 97.49 Granted 195,171 114.38 Vested (94,388 ) 92.00 Cancelled or expired (3,724 ) 105.88 Unvested, end of period 392,560 $ 109.07

Derivative Instruments (Tables)

Derivative Instruments (Tables)	3 Months Ended
	Mar. 31, 2019
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Outstanding Derivative Instruments	As of March 31, 2019 and December 31, 2018 , we had the following outstanding interest rate derivatives that were designated as effective cash flow hedges of interest rate risk (in thousands): Notional Amount Fair Value at Significant Other As of March 31, 2019 As of December 31, 2018 Type of Strike Effective Date Expiration Date As of March 31, 2019 (3) As of December 31, 2018 (3) Currently-paying contracts $ 206,000 (1) $ 206,000 (1) Swap 1.611 Jun 15, 2017 Jan 15, 2020 $ 1,311 $ 1,976 54,905 (1) 54,905 (1) Swap 1.605 Jun 6, 2017 Jan 6, 2020 343 517 75,000 (1) 75,000 (1) Swap 1.016 Apr 6, 2016 Jan 6, 2021 1,636 2,169 75,000 (1) 75,000 (1) Swap 1.164 Jan 15, 2016 Jan 15, 2021 1,456 1,970 300,000 (1) 300,000 (1) Swap 1.435 Jan 15, 2016 Jan 15, 2023 7,809 11,463 73,786 (2) 72,220 (2) Swap 0.779 Jan 15, 2016 Jan 15, 2021 1,434 2,024 $ 784,691 $ 783,125 $ 13,989 $ 20,119 (1) Represents debt which bears interest based on one-month U.S. LIBOR. (2) Represents debt which bears interest based on one-month CDOR. Translation to U.S. dollars is based on exchange rates of $0.75 to 1.00 CAD as of March 31, 2019 and $0.73 to 1.00 CAD as of December 31, 2018 . (3) Balance recorded in other assets in the consolidated balance sheets if positive and recorded in accounts payable and other accrued liabilities in the consolidated balance sheets if negative.

Fair Value of Financial Instr_2

Fair Value of Financial Instruments (Tables)	3 Months Ended
	Mar. 31, 2019
Fair Value Disclosures [Abstract]
Estimated Fair Value And Carrying Amounts	As of March 31, 2019 and December 31, 2018 , the aggregate estimated fair value and carrying value of our global revolving credit facility, unsecured term loans, unsecured senior notes and mortgage loans were as follows (in thousands): Categorization under the fair value hierarchy As of March 31, 2019 As of December 31, 2018 Estimated Fair Value Carrying Value Estimated Fair Value Carrying Value Global revolving credit facility (1)(5) Level 2 $ 857,211 $ 857,211 $ 1,663,156 $ 1,663,156 Unsecured term loans (2)(6) Level 2 811,654 811,654 1,183,121 1,183,121 Unsecured senior notes (3)(4)(7) Level 2 8,879,673 8,569,195 7,684,368 7,629,679 Secured debt (3)(8) Level 2 105,769 105,745 706,086 705,924 $ 10,654,307 $ 10,343,805 $ 11,236,731 $ 11,181,880 (1) The carrying value of our global revolving credit facilities approximate estimated fair value, due to the variability of interest rates and the stability of our credit ratings. (2) The carrying value of our unsecured term loans approximates estimated fair value, due to the variability of interest rates and the stability of our credit ratings. (3) Valuations for our unsecured senior notes and secured debt are determined based on the expected future payments discounted at risk-adjusted rates. The 2019 Notes, 3.400% 2020 Notes, 2021 Notes, 3.950% 2022 Notes, 3.625% 2022 Notes, 4.750% 2023 Notes, 2.750% 2023 Notes, 2.625% 2024 Notes, 2.750% 2024 Notes, 4.750% 2025 Notes, 4.250% 2025 Notes, 2026 Notes, 2027 Notes, 2028 Notes, 2029 Notes and 2030 Notes are valued based on quoted market prices. (4) The carrying value of the 3.400% 2020 Notes, 2021 Notes, 3.625% 2022 Notes, 3.950% 2022 Notes, 4.750% 2023 Notes, 2.750% 2023 Notes, 2.625% 2024 Notes, 2.750% 2024 Notes, 4.250% 2025 Notes, 2026 Notes, 2027 Notes, 2028 Notes, 2029 Notes and 2030 Notes are net of discount of $11.5 million and $19.9 million in the aggregate as of March 31, 2019 and December 31, 2018 , respectively. (5) The estimated fair value and carrying value are exclusive of deferred financing costs of $14.2 million and $15.4 million as of March 31, 2019 and December 31, 2018 , respectively. (6) The estimated fair value and carrying value are exclusive of deferred financing costs of $3.9 million and $4.2 million as of March 31, 2019 and December 31, 2018 , respectively. (7) The estimated fair value and carrying value are exclusive of deferred financing costs of $45.7 million and $40.6 million as of March 31, 2019 and December 31, 2018 , respectively. (8) The estimated fair value and carrying value are exclusive of deferred financing costs of $0.3 million and $20.2 million as of March 31, 2019 and December 31, 2018 , respectively.

Organization and Description _3

Organization and Description of Business (Details) $ in Millions	Dec. 20, 2018USD ($)	Mar. 31, 2019property	Mar. 29, 2019USD ($)	Dec. 31, 2018property
Organization and Description of Business [Line Items]
Number of properties		215		214
Common Interest
Organization and Description of Business [Line Items]
Ownership percentage in joint ventures		95.60%		95.10%
Preferred Interest
Organization and Description of Business [Line Items]
Ownership percentage in joint ventures		100.00%		100.00%
Ascenty Acquisition
Organization and Description of Business [Line Items]
Payment for acquisition | $	$ 2,000
Operating
Organization and Description of Business [Line Items]
Number of properties		180		196
Unconsolidated Joint Ventures
Organization and Description of Business [Line Items]
Number of properties		35		18
United States
Organization and Description of Business [Line Items]
Number of properties		145		145
United States | Operating
Organization and Description of Business [Line Items]
Number of properties		131		131
United States | Unconsolidated Joint Ventures
Organization and Description of Business [Line Items]
Number of properties		14		14
Europe
Organization and Description of Business [Line Items]
Number of properties		38		38
Europe | Operating
Organization and Description of Business [Line Items]
Number of properties		38		38
Europe | Unconsolidated Joint Ventures
Organization and Description of Business [Line Items]
Number of properties		0		0
Latin America
Organization and Description of Business [Line Items]
Number of properties		17		16
Latin America | Operating
Organization and Description of Business [Line Items]
Number of properties		0		16
Latin America | Unconsolidated Joint Ventures
Organization and Description of Business [Line Items]
Number of properties		17		0
Asia
Organization and Description of Business [Line Items]
Number of properties		7		7
Asia | Operating
Organization and Description of Business [Line Items]
Number of properties		3		3
Asia | Unconsolidated Joint Ventures
Organization and Description of Business [Line Items]
Number of properties		4		4
Australia
Organization and Description of Business [Line Items]
Number of properties		5		5
Australia | Operating
Organization and Description of Business [Line Items]
Number of properties		5		5
Australia | Unconsolidated Joint Ventures
Organization and Description of Business [Line Items]
Number of properties		0		0
Canada
Organization and Description of Business [Line Items]
Number of properties		3		3
Canada | Operating
Organization and Description of Business [Line Items]
Number of properties		3		3
Canada | Unconsolidated Joint Ventures
Organization and Description of Business [Line Items]
Number of properties		0		0
Ascenty Acquisition
Organization and Description of Business [Line Items]
Ownership percentage in joint ventures		51.00%	51.00%
Brookfield Infrastructure | Ascenty Acquisition
Organization and Description of Business [Line Items]
Investment | $			$ 700
Ownership percentage in joint ventures			49.00%

Summary of Significant Accoun_4

Summary of Significant Accounting Policies (Narrative) (Details)	3 Months Ended		12 Months Ended
	Mar. 31, 2019USD ($)segment	Mar. 31, 2018USD ($)	Dec. 31, 2018USD ($)
Summary Of Significant Accounting Policies [Line Items]
Period in which short-term investment become cash equivalents	90 days
Interest capitalized	$ 10,900,000	$ 7,400,000
Compensation costs, leasing and construction activities	10,700,000	10,100,000
Unrecognized tax benefits	0		$ 0
Income tax penalties and interest expense	$ 0	0
Gross proceeds		139,300,000
Gain on sale of property		39,400,000
Number of reportable segments | segment	1
Total operating revenues	$ 814,515,000	$ 744,368,000
Net investments in real estate	15,542,054,000		$ 15,079,726,000
Ascenty Acquisition
Summary Of Significant Accounting Policies [Line Items]
Net investments in real estate	$ 362,951,000
Total long-lived assets
Summary Of Significant Accounting Policies [Line Items]
Concentration risk			10.90%
ASU 2016-02
Summary Of Significant Accounting Policies [Line Items]
Revenue recognized from applying Topic 840	99.00%	97.00%
Accumulated dividends in excess of earnings	$ 6,300,000
ASU 2014-09
Summary Of Significant Accounting Policies [Line Items]
Revenue recognized from applying Topic 840	1.00%	3.00%
Outside the United States
Summary Of Significant Accounting Policies [Line Items]
Total operating revenues	$ 179,100,000	$ 140,900,000
Net investments in real estate	3,500,000,000		$ 3,800,000,000
United States
Summary Of Significant Accounting Policies [Line Items]
Total operating revenues	635,400,000	603,500,000
Net investments in real estate	11,100,000,000		11,100,000,000
United Kingdom
Summary Of Significant Accounting Policies [Line Items]
Total operating revenues	73,300,000	$ 75,200,000
Net investments in real estate	$ 1,700,000,000		$ 1,600,000,000
Geographic Concentration Risk | Sales
Summary Of Significant Accounting Policies [Line Items]
Concentration risk	9.00%	10.10%
Geographic Concentration Risk | Total long-lived assets
Summary Of Significant Accounting Policies [Line Items]
Concentration risk	11.50%

Summary of Significant Accoun_5

Summary of Significant Accounting Policies (Capitalization of Costs) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Capitalized Contract Cost [Line Items]
Land	$ 864,990	$ 859,113
Buildings and improvements	15,510,434	15,610,992
Construction in progress and space held for development	1,584,328	1,621,928
Land held for future development	$ 163,081	162,941
As Previously Reported
Capitalized Contract Cost [Line Items]
Land		1,509,764
Buildings and improvements		16,745,210
Construction in progress and space held for development		0
Land held for future development		0
Adjustments
Capitalized Contract Cost [Line Items]
Land		(650,651)
Buildings and improvements		(1,134,218)
Construction in progress and space held for development		1,621,928
Land held for future development		$ 162,941

Summary of Significant Accoun_6

Summary of Significant Accounting Policies (Summary of Goodwill Activity) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Goodwill [Roll Forward]
Goodwill - Beginning Balance	$ 4,348,007
Deconsolidation	(982,667)
Goodwill Adjustments	(9,436)
Impact of Change in Foreign Exchange Rates	2,559
Goodwill - Ending Balance	3,358,463
Telx Acquisition
Goodwill [Roll Forward]
Goodwill - Beginning Balance	330,845
Deconsolidation	0
Goodwill Adjustments	0
Impact of Change in Foreign Exchange Rates	0
Goodwill - Ending Balance	330,845
European Portfolio Acquisition
Goodwill [Roll Forward]
Goodwill - Beginning Balance	442,349
Deconsolidation	0
Goodwill Adjustments	(9,436)
Impact of Change in Foreign Exchange Rates	2,559
Goodwill - Ending Balance	435,472
DFT Merger
Goodwill [Roll Forward]
Goodwill - Beginning Balance	2,592,146
Deconsolidation	0
Goodwill Adjustments	0
Impact of Change in Foreign Exchange Rates	0
Goodwill - Ending Balance	2,592,146
Ascenty Acquisition
Goodwill [Roll Forward]
Goodwill - Beginning Balance	982,667
Deconsolidation	(982,667)
Goodwill Adjustments	0
Impact of Change in Foreign Exchange Rates	0
Goodwill - Ending Balance	$ 0

Real Estate (Schedule of Real E

Real Estate (Schedule of Real Estate Property Acquisitions) (Details) $ in Millions	May 03, 2018USD ($)
Dulles World Park
Business Acquisition [Line Items]
Payment to acquire real estate	$ 9

Investments in Unconsolidated_3

Investments in Unconsolidated Joint Ventures (Summary Of Financial Information For Joint Ventures) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Mar. 29, 2019	Dec. 31, 2018
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	$ 930,326		$ 175,108
Noncontrolling interests in consolidated joint ventures	$ 121,160		93,056
Ascenty Acquisition
Schedule of Equity Method Investments [Line Items]
% Ownership	51.00%	51.00%
Investments in unconsolidated joint ventures	$ 743,083		0
Ownership interest by noncontrolling interest	2.00%
Noncontrolling interests in consolidated joint ventures	$ 25,000
Chun Choi
Schedule of Equity Method Investments [Line Items]
% Ownership	50.00%
Investments in unconsolidated joint ventures	$ 96,988		96,094
Digital MC
Schedule of Equity Method Investments [Line Items]
% Ownership	50.00%
Investments in unconsolidated joint ventures	$ 77,845		66,835
Other
Schedule of Equity Method Investments [Line Items]
Investments in unconsolidated joint ventures	$ 12,410		$ 12,179

Leases (Supplemental Balance Sh

Leases (Supplemental Balance Sheet Information) (Details) $ in Thousands	Mar. 31, 2019USD ($)
Assets:
Operating lease assets	$ 660,586
Finance lease assets	124,371
Total leased assets	784,957
Liabilities:
Operating lease liabilities	725,470
Finance lease liabilities	167,764
Total lease liabilities	$ 893,234

Investments in Unconsolidated_4

Investments in Unconsolidated Joint Ventures (Narrative) (Details) - USD ($) $ in Thousands	Mar. 29, 2019	Dec. 20, 2018	Mar. 31, 2019	Mar. 31, 2018
Schedule of Equity Method Investments [Line Items]
Reclassification of foreign currency translation adjustment due to deconsolidation of Ascenty			$ 21,687	$ 0
Ascenty Acquisition
Schedule of Equity Method Investments [Line Items]
Ownership percentage in joint ventures	51.00%		51.00%
Recognition of retained equity investment in unconsolidated Ascenty joint venture	$ 727,439
Deconsolidation gain recognized, net of taxes and foreign currency loss			$ 67,500
Ascenty Acquisition | Brookfield Infrastructure
Schedule of Equity Method Investments [Line Items]
Investment	$ 700,000
Ownership percentage in joint ventures	49.00%
Ascenty Acquisition
Schedule of Equity Method Investments [Line Items]
Total consideration of assets and liabilities acquired		$ 2,000,000
Cash assumed in merger		116,000
Noncontrolling Interest, Decrease from Deconsolidation	$ 89,200
Reclassification of foreign currency translation adjustment due to deconsolidation of Ascenty			$ 21,700
Recognition of retained equity investment in unconsolidated Ascenty joint venture	727,000
Proceeds from Divestiture of Businesses	$ 702,000
Ascenty Acquisition | Digital Realty Operating Partnership Units
Schedule of Equity Method Investments [Line Items]
Equity interest in exchange for units		254,000
Ascenty Acquisition | Secured Term Loan | Secured Term Loan, 5 Year
Schedule of Equity Method Investments [Line Items]
Long-term debt		$ 600,000
Debt instrument term		5 years
Ascenty Acquisition | Secured Term Loan | Unsecured Debt
Schedule of Equity Method Investments [Line Items]
Long-term debt		$ 1,000,000

Leases (Lease Expense) (Details

Leases (Lease Expense) (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Finance lease cost:
Amortization of right-of-use assets	$ 1,227
Interest on lease liabilities	1,646
Operating lease cost	23,114
Total lease cost	$ 25,987

Leases (Narrative) (Details)

Leases (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Lessor, Lease, Description [Line Items]
Weighted average remaining lease term, operating lease	13 years
Weighted average remaining lease term, finance lease	25 years
Incremental borrowing rate, operating lease	4.10%
Incremental borrowing rate, finance lease	3.90%
Lease revenue			$ 3,000,000
Revenues	$ 814,515	$ 744,368
Initial direct costs			37,000
Rental and other services
Lessor, Lease, Description [Line Items]
Revenues	812,030	592,298	2,100,000
Tenant reimbursements
Lessor, Lease, Description [Line Items]
Revenues	$ 0	$ 150,079	$ 600,000

Leases (Minimum Commitment Unde

Leases (Minimum Commitment Under Operating Leases) (Details) $ in Thousands	Dec. 31, 2018USD ($)
Leases [Abstract]
2019	$ 84,712
2020	87,396
2021	86,212
2022	81,976
2023	80,707
Thereafter	539,047
Total undiscounted future cash flows	$ 960,050

Leases (Future Minimum Lease Pa

Leases (Future Minimum Lease Payments for Capital Lease Obligations) (Details) $ in Thousands	Dec. 31, 2018USD ($)
Leases [Abstract]
2019	$ 11,657
2020	13,108
2021	13,207
2022	13,706
2023	14,219
Thereafter	285,774
Total	351,671
Less amount representing interest	(137,827)
Present value	$ 213,844

Leases (Maturities of Lease Lia

Leases (Maturities of Lease Liabilities) (Details) $ in Thousands	Mar. 31, 2019USD ($)
Operating lease liabilities
Remainder of 2019	$ 62,313
2020	84,415
2021	83,181
2022	79,187
2023	78,382
Thereafter	548,011
Total undiscounted future cash flows	935,489
Less: Imputed interest	(210,019)
Present value of undiscounted future cash flows	725,470
Finance lease liabilities
Remainder of 2019	5,351
2020	8,823
2021	8,868
2022	9,332
2023	9,788
Thereafter	234,658
Total undiscounted future cash flows	276,820
Less: Imputed interest	(109,056)
Present value of undiscounted future cash flows	$ 167,764

(Minimum Lease Payments From Cu

(Minimum Lease Payments From Customers) (Details) $ in Thousands	Mar. 31, 2019USD ($)
Leases [Abstract]
Remainder of 2019	$ 1,761,276
2020	1,949,524
2021	1,714,577
2022	1,411,271
2023	1,211,576
Thereafter	4,400,329
Total	$ 12,448,553

Acquired Intangible Assets an_3

Acquired Intangible Assets and Liabilities (Summary of Acquired Intangible Assets) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Below-market lease, gross amount	$ 442,936	$ 442,535
Below-market lease, accumulated amortization	(250,269)	(242,422)
Total	192,667	200,113
Acquired in-place lease value
Finite-Lived Intangible Assets [Line Items]
Intangible assets written off due to deconsolidation	120,000
Gross amount (1)	1,450,914	1,569,401
Accumulated amortization	(840,778)	(795,033)
Net	610,136	774,368
Tenant relationship value
Finite-Lived Intangible Assets [Line Items]
Intangible assets written off due to deconsolidation	375,000
Gross amount (1)	1,966,006	2,339,606
Accumulated amortization	(322,791)	(291,818)
Net	1,643,215	2,047,788
Acquired above-market leases
Finite-Lived Intangible Assets [Line Items]
Gross amount (1)	278,592	277,796
Accumulated amortization	(172,548)	(158,037)
Net	$ 106,044	$ 119,759

Acquired Intangible Assets an_4

Acquired Intangible Assets and Liabilities (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Finite-Lived Intangible Assets [Line Items]
Increase (decrease) in rental revenues	$ (6,200)	$ (6,900)
Expected average remaining lives of acquired below market leases (in years)	7 years 11 months 16 days
Amortization of acquired in-place lease value and deferred leasing costs	$ 103,934	108,358
Acquired above-market leases
Finite-Lived Intangible Assets [Line Items]
Expected average remaining lives (in years)	2 years 8 months 1 day
Acquired in-place lease value
Finite-Lived Intangible Assets [Line Items]
Expected average remaining lives (in years)	5 years 11 months 1 day
Amortization of acquired in-place lease value and deferred leasing costs	$ 44,900	57,000
Weighted average remaining contractual life for acquired leases excluding renewals or extensions (in years)	5 years 5 months 15 days
Tenant relationship value
Finite-Lived Intangible Assets [Line Items]
Amortization of acquired in-place lease value and deferred leasing costs	$ 38,000	$ 31,000
Weighted average remaining contractual life for acquired leases excluding renewals or extensions (in years)	14 years 1 day

Acquired Intangible Assets an_5

Acquired Intangible Assets and Liabilities (Schedule of Estimated Annual Amortization of Below Market Leases) (Details) - Below-Market Leases, Net of Above-Market Leases $ in Thousands	Mar. 31, 2019USD ($)
Finite-Lived Intangible Assets [Line Items]
Remainder of 2019	$ (9,150)
2020	(3,912)
2021	889
2022	7,923
2023	12,070
Thereafter	78,803
Total	$ 86,623

Acquired Intangible Assets An_6

Acquired Intangible Assets And Liabilities (Schedule of Estimated Annual Amortization of Intangible Assets) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Acquired in-place lease value
Finite-Lived Intangible Assets [Line Items]
Remainder of 2019	$ 101,543
2020	111,585
2021	87,036
2022	65,153
2023	53,596
Thereafter	191,223
Net	610,136	$ 774,368
Tenant relationships
Finite-Lived Intangible Assets [Line Items]
Remainder of 2019	92,301
2020	123,069
2021	123,069
2022	123,069
2023	123,069
Thereafter	1,058,638
Net	$ 1,643,215

Debt of the Company (Narrative)

Debt of the Company (Narrative) (Details)	Mar. 31, 2019
3.400% notes due 2020
Debt Instrument [Line Items]
Stated interest rate	3.40%
3.950% notes due 2022
Debt Instrument [Line Items]
Stated interest rate	3.95%
3.625% notes due 2022
Debt Instrument [Line Items]
Stated interest rate	3.625%
4.750% notes due 2025
Debt Instrument [Line Items]
Stated interest rate	4.75%
2.750% notes due 2024
Debt Instrument [Line Items]
Stated interest rate	2.75%
2.625% notes due 2024
Debt Instrument [Line Items]
Stated interest rate	2.625%
Senior Notes | 3.400% notes due 2020
Debt Instrument [Line Items]
Stated interest rate	3.40%
Senior Notes | 5.250% notes due 2021
Debt Instrument [Line Items]
Stated interest rate	5.25%
Senior Notes | 3.950% notes due 2022
Debt Instrument [Line Items]
Stated interest rate	3.95%
Senior Notes | 3.625% notes due 2022
Debt Instrument [Line Items]
Stated interest rate	3.625%
Senior Notes | 2.750% notes due 2023
Debt Instrument [Line Items]
Stated interest rate	2.75%
Senior Notes | 4.750% notes due 2025
Debt Instrument [Line Items]
Stated interest rate	4.75%
Senior Notes | 3.700% notes due 2027
Debt Instrument [Line Items]
Stated interest rate	3.70%
Senior Notes | 4.450% notes due 2028
Debt Instrument [Line Items]
Stated interest rate	4.45%
Senior Notes | 4.750% notes due 2023
Debt Instrument [Line Items]
Stated interest rate	4.75%
Senior Notes | 2.750% notes due 2024
Debt Instrument [Line Items]
Stated interest rate	2.75%
Senior Notes | 4.250% notes due 2025
Debt Instrument [Line Items]
Stated interest rate	4.25%
Senior Notes | 3.300% notes due 2029
Debt Instrument [Line Items]
Stated interest rate	3.30%
Senior Notes | 3.750% notes due 2030
Debt Instrument [Line Items]
Stated interest rate	3.75%
Senior Notes | 2.625% notes due 2024
Debt Instrument [Line Items]
Stated interest rate	2.625%
Senior Notes | 2.500% notes due 2026
Debt Instrument [Line Items]
Stated interest rate	2.50%

Debt of the Operating Partner_3

Debt of the Operating Partnership (Summary of Outstanding Indebtedness) (Details) $ in Thousands	Jan. 15, 2016extension	Mar. 31, 2019USD ($)extension$ / €$ / £	Jan. 16, 2019	Dec. 31, 2018USD ($)$ / €$ / £
3.950% notes due 2022
Debt Instrument [Line Items]
Stated interest rate		3.95%
3.625% notes due 2022
Debt Instrument [Line Items]
Stated interest rate		3.625%
2.625% notes due 2024
Debt Instrument [Line Items]
Stated interest rate		2.625%
2.750% notes due 2024
Debt Instrument [Line Items]
Stated interest rate		2.75%
4.750% notes due 2025
Debt Instrument [Line Items]
Stated interest rate		4.75%
Global revolving credit facilities
Debt Instrument [Line Items]
Deferred financing costs		$ (14,200)		$ (15,400)
Unsecured Term Loans
Debt Instrument [Line Items]
Deferred financing costs		(3,900)		(4,200)
Senior Notes
Debt Instrument [Line Items]
Deferred financing costs		$ (45,700)		(40,600)
Senior Notes | 5.250% notes due 2021
Debt Instrument [Line Items]
Stated interest rate		5.25%
Senior Notes | 3.950% notes due 2022
Debt Instrument [Line Items]
Stated interest rate		3.95%
Senior Notes | 3.625% notes due 2022
Debt Instrument [Line Items]
Stated interest rate		3.625%
Senior Notes | 2.750% notes due 2023
Debt Instrument [Line Items]
Stated interest rate		2.75%
Senior Notes | 4.750% notes due 2023
Debt Instrument [Line Items]
Stated interest rate		4.75%
Senior Notes | 2.625% notes due 2024
Debt Instrument [Line Items]
Stated interest rate		2.625%
Senior Notes | 2.750% notes due 2024
Debt Instrument [Line Items]
Stated interest rate		2.75%
Senior Notes | 4.250% notes due 2025
Debt Instrument [Line Items]
Stated interest rate		4.25%
Senior Notes | 4.750% notes due 2025
Debt Instrument [Line Items]
Stated interest rate		4.75%
Senior Notes | 2.500% notes due 2026
Debt Instrument [Line Items]
Stated interest rate		2.50%
Senior Notes | 3.700% notes due 2027
Debt Instrument [Line Items]
Stated interest rate		3.70%
Senior Notes | 4.450% notes due 2028
Debt Instrument [Line Items]
Stated interest rate		4.45%
Senior Notes | 3.300% notes due 2029
Debt Instrument [Line Items]
Stated interest rate		3.30%
Senior Notes | 3.750% notes due 2030
Debt Instrument [Line Items]
Stated interest rate		3.75%
Secured Debt
Debt Instrument [Line Items]
Deferred financing costs		$ (300)		(20,200)
Digital Realty Trust, L.P.
Debt Instrument [Line Items]
Long-term debt, gross		10,355,201
Total indebtedness		10,279,656		11,101,479
Unamortized net premiums		7,188
Long-term debt, net of discount (premium)		10,343,805
Digital Realty Trust, L.P. | Global revolving credit facilities
Debt Instrument [Line Items]
Long-term debt, gross		857,211		1,663,156
Deferred financing costs		(14,236)		(15,421)
Total indebtedness		842,975		$ 1,647,735
Unamortized net premiums		0
Long-term debt, net of discount (premium)		$ 857,211
Commitment fee percentage		0.20%
Interest rate basis spread		0.90%
Number of extension options | extension	2	2
Debt instrument, extension term	6 months	6 months
Letters of credit issued		$ 45,000
Digital Realty Trust, L.P. | Global revolving credit facilities | British pound sterling (£)
Debt Instrument [Line Items]
Exchange rate | $ / £				1.28
Digital Realty Trust, L.P. | Global revolving credit facilities | Euro (€)
Debt Instrument [Line Items]
Exchange rate | $ / €		1.12		1.15
Digital Realty Trust, L.P. | Yen Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross		$ 172,933		$ 134,564
Commitment fee percentage		0.50%
Digital Realty Trust, L.P. | Unsecured Term Loans
Debt Instrument [Line Items]
Long-term debt, gross		$ 811,654
Deferred financing costs		(3,928)		(4,216)
Total indebtedness		807,726		$ 1,178,904
Unamortized net premiums		0
Long-term debt, net of discount (premium)		$ 811,654
Digital Realty Trust, L.P. | Unsecured Term Loans | British pound sterling (£)
Debt Instrument [Line Items]
Exchange rate | $ / £		1.30		1.28
Digital Realty Trust, L.P. | Unsecured Term Loans | 2019 Term Loan
Debt Instrument [Line Items]
Long-term debt, gross		$ 0		$ 375,000
Digital Realty Trust, L.P. | Unsecured Term Loans | 2019 Term Loan | Base Rate
Debt Instrument [Line Items]
Interest rate basis spread		1.00%
Digital Realty Trust, L.P. | Unsecured Term Loans | 2023 Term Loan
Debt Instrument [Line Items]
Long-term debt, gross		$ 300,000		300,000
Digital Realty Trust, L.P. | Unsecured Term Loans | 2024 Term Loan
Debt Instrument [Line Items]
Long-term debt, gross		511,654		508,120
Digital Realty Trust, L.P. | Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross		8,580,715
Deferred financing costs		(45,733)		(40,553)
Total indebtedness		8,523,462		7,589,126
Unamortized discounts, net of premiums		(11,520)		(19,859)
Unamortized net premiums		7,064
Long-term debt, net of discount (premium)		8,569,195		7,629,679
Digital Realty Trust, L.P. | Senior Notes | Floating rate notes due 2019
Debt Instrument [Line Items]
Long-term debt, gross		$ 140,225		143,338
Digital Realty Trust, L.P. | Senior Notes | Floating rate notes due 2019 | EURIBOR
Debt Instrument [Line Items]
Interest rate basis spread		0.50%
Digital Realty Trust, L.P. | Senior Notes | 5.875% notes due 2020
Debt Instrument [Line Items]
Long-term debt, gross		$ 0		500,000
Stated interest rate		5.875%	5.875%
Digital Realty Trust, L.P. | Senior Notes | 3.400% notes due 2020
Debt Instrument [Line Items]
Long-term debt, gross		$ 500,000		500,000
Stated interest rate		3.40%
Digital Realty Trust, L.P. | Senior Notes | 5.250% notes due 2021
Debt Instrument [Line Items]
Long-term debt, gross		$ 400,000		400,000
Stated interest rate		5.25%
Digital Realty Trust, L.P. | Senior Notes | 3.950% notes due 2022
Debt Instrument [Line Items]
Long-term debt, gross		$ 500,000		500,000
Stated interest rate		3.95%
Digital Realty Trust, L.P. | Senior Notes | 3.625% notes due 2022
Debt Instrument [Line Items]
Long-term debt, gross		$ 300,000		300,000
Stated interest rate		3.625%
Digital Realty Trust, L.P. | Senior Notes | 2.750% notes due 2023
Debt Instrument [Line Items]
Long-term debt, gross		$ 350,000		350,000
Stated interest rate		2.75%
Digital Realty Trust, L.P. | Senior Notes | 4.750% notes due 2023
Debt Instrument [Line Items]
Long-term debt, gross		$ 391,050		382,620
Stated interest rate		4.75%
Digital Realty Trust, L.P. | Senior Notes | 2.625% notes due 2024
Debt Instrument [Line Items]
Long-term debt, gross		$ 673,080		688,020
Stated interest rate		2.625%
Digital Realty Trust, L.P. | Senior Notes | 2.750% notes due 2024
Debt Instrument [Line Items]
Long-term debt, gross		$ 325,875		318,850
Stated interest rate		2.75%
Digital Realty Trust, L.P. | Senior Notes | 4.250% notes due 2025
Debt Instrument [Line Items]
Long-term debt, gross		$ 521,400		510,160
Stated interest rate		4.25%
Digital Realty Trust, L.P. | Senior Notes | 4.750% notes due 2025
Debt Instrument [Line Items]
Long-term debt, gross		$ 450,000		450,000
Stated interest rate		4.75%
Digital Realty Trust, L.P. | Senior Notes | 2.500% notes due 2026
Debt Instrument [Line Items]
Long-term debt, gross		$ 1,205,935		0
Stated interest rate		2.50%	2.50%
Digital Realty Trust, L.P. | Senior Notes | 3.700% notes due 2027
Debt Instrument [Line Items]
Long-term debt, gross		$ 1,000,000		1,000,000
Stated interest rate		3.70%
Digital Realty Trust, L.P. | Senior Notes | 4.450% notes due 2028
Debt Instrument [Line Items]
Long-term debt, gross		$ 650,000		650,000
Stated interest rate		4.45%
Digital Realty Trust, L.P. | Senior Notes | 3.300% notes due 2029
Debt Instrument [Line Items]
Long-term debt, gross		$ 456,225		446,390
Stated interest rate		3.30%
Digital Realty Trust, L.P. | Senior Notes | 3.750% notes due 2030
Debt Instrument [Line Items]
Long-term debt, gross		$ 716,925		510,160
Stated interest rate		3.75%	2.50%
Digital Realty Trust, L.P. | Senior Notes | Secured note due March 2023 | LIBOR
Debt Instrument [Line Items]
Interest rate basis spread		1.10%
Digital Realty Trust, L.P. | Senior Notes | Secured note due December 2023 | Base Rate
Debt Instrument [Line Items]
Interest rate basis spread		4.25%
Digital Realty Trust, L.P. | Secured Debt
Debt Instrument [Line Items]
Long-term debt, gross		$ 105,621
Deferred financing costs		(252)		(20,210)
Total indebtedness		105,493		685,714
Unamortized net premiums		124		148
Long-term debt, net of discount (premium)		105,745		705,924
Digital Realty Trust, L.P. | Secured Debt | 731 East Trade Street
Debt Instrument [Line Items]
Long-term debt, gross		$ 1,621		1,776
Effective interest rate (as a percent)		8.22%
Digital Realty Trust, L.P. | Secured Debt | Secured note due March 2023
Debt Instrument [Line Items]
Long-term debt, gross		$ 104,000		104,000
Digital Realty Trust, L.P. | Secured Debt | Secured note due December 2023
Debt Instrument [Line Items]
Long-term debt, gross		$ 0		$ 600,000

Debt of the Operating Partner_4

Debt of the Operating Partnership (Floating and Base Rate Borrowing) (Details) - Digital Realty Trust, L.P. $ in Thousands, £ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)$ / $$ / €$ / ¥$ / £$ / $$ / $$ / $	Mar. 05, 2019GBP (£)	Dec. 31, 2018USD ($)$ / $$ / €$ / ¥$ / £$ / $$ / $$ / $	Oct. 17, 2018GBP (£)
Debt Instrument [Line Items]
Long-term debt, gross	$ 10,355,201
Global revolving credit facilities
Debt Instrument [Line Items]
Long-term debt, gross	$ 857,211		$ 1,663,156
Interest rate basis spread	0.90%
Global revolving credit facilities | Floating Rate
Debt Instrument [Line Items]
Long-term debt, gross	$ 684,278		$ 1,528,592
Weighted-average interest rate	2.47%		2.57%
Interest rate basis spread	0.90%
Yen Revolving Credit Facility
Debt Instrument [Line Items]
Long-term debt, gross	$ 172,933		$ 134,564
Weighted-average interest rate	0.50%		0.50%
Unsecured Term Loans
Debt Instrument [Line Items]
Long-term debt, gross	$ 811,654
Early extinguishment charge	12,900
Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross	8,580,715
Revolving Credit Facility | Floating Rate
Debt Instrument [Line Items]
Long-term debt, gross	$ 857,211		$ 1,663,156
Weighted-average interest rate	2.07%		2.41%
U.S. dollar ($) | Global revolving credit facilities | Floating Rate
Debt Instrument [Line Items]
Long-term debt, gross	$ 290,000		$ 890,000
Weighted-average interest rate	3.39%		3.37%
British pound sterling (£) | Global revolving credit facilities
Debt Instrument [Line Items]
Exchange rate | $ / £			1.28
British pound sterling (£) | Global revolving credit facilities | Floating Rate
Debt Instrument [Line Items]
Long-term debt, gross	$ 0		$ 8,290
Weighted-average interest rate	0.00%		1.61%
British pound sterling (£) | Unsecured Term Loans
Debt Instrument [Line Items]
Exchange rate | $ / £	1.30		1.28
Euro (€) | Global revolving credit facilities
Debt Instrument [Line Items]
Exchange rate | $ / €	1.12		1.15
Euro (€) | Global revolving credit facilities | Floating Rate
Debt Instrument [Line Items]
Long-term debt, gross	$ 203,046		$ 451,800
Weighted-average interest rate	0.90%		0.90%
Australian dollar (AUD) | Global revolving credit facilities
Debt Instrument [Line Items]
Exchange rate | $ / $	0.71
Australian dollar (AUD) | Global revolving credit facilities | Floating Rate
Debt Instrument [Line Items]
Long-term debt, gross	$ 31,648		$ 27,632
Weighted-average interest rate	2.74%		2.82%
Australian dollar (AUD) | Unsecured Term Loans
Debt Instrument [Line Items]
Exchange rate | $ / $	0.71		0.70
Hong Kong dollar (HKD) | Global revolving credit facilities
Debt Instrument [Line Items]
Exchange rate | $ / $	0.13		0.13
Hong Kong dollar (HKD) | Global revolving credit facilities | Floating Rate
Debt Instrument [Line Items]
Long-term debt, gross	$ 10,051		$ 8,797
Weighted-average interest rate	2.43%		3.14%
Hong Kong dollar (HKD) | Unsecured Term Loans
Debt Instrument [Line Items]
Exchange rate | $ / $	0.13		0.13
Japanese yen (JPY) | Global revolving credit facilities
Debt Instrument [Line Items]
Exchange rate | $ / ¥	0.01		0.01
Japanese yen (JPY) | Global revolving credit facilities | Floating Rate
Debt Instrument [Line Items]
Long-term debt, gross	$ 4,059		$ 4,105
Weighted-average interest rate	0.90%		0.90%
Singapore dollar (SGD) | Global revolving credit facilities
Debt Instrument [Line Items]
Exchange rate | $ / $	0.74
Singapore dollar (SGD) | Global revolving credit facilities | Floating Rate
Debt Instrument [Line Items]
Long-term debt, gross	$ 77,680		$ 77,112
Weighted-average interest rate	2.83%		2.79%
Singapore dollar (SGD) | Unsecured Term Loans
Debt Instrument [Line Items]
Exchange rate | $ / $	0.74		0.73
Canadian dollar (CAD) | Global revolving credit facilities
Debt Instrument [Line Items]
Exchange rate | $ / $	0.75		0.73
Canadian dollar (CAD) | Global revolving credit facilities | Floating Rate
Debt Instrument [Line Items]
Long-term debt, gross	$ 67,794		$ 60,856
Weighted-average interest rate	2.81%		3.16%
Canadian dollar (CAD) | Unsecured Term Loans
Debt Instrument [Line Items]
Exchange rate | $ / $	0.75		0.73
2023 and 2024 Term Loan | Unsecured Term Loans
Debt Instrument [Line Items]
Long-term debt, gross	$ 811,654		$ 808,120
Weighted-average interest rate	3.05%		3.17%
Interest rate basis spread	0.00%
2023 and 2024 Term Loan | U.S. dollar ($) | Unsecured Term Loans
Debt Instrument [Line Items]
Long-term debt, gross	$ 300,000		$ 300,000
Weighted-average interest rate	3.48%		3.46%
2023 and 2024 Term Loan | Australian dollar (AUD) | Unsecured Term Loans
Debt Instrument [Line Items]
Long-term debt, gross	$ 205,997		$ 204,632
Weighted-average interest rate	2.85%		2.94%
2023 and 2024 Term Loan | Hong Kong dollar (HKD) | Unsecured Term Loans
Debt Instrument [Line Items]
Long-term debt, gross	$ 84,995		$ 85,188
Weighted-average interest rate	2.55%		3.32%
2023 and 2024 Term Loan | Singapore dollar (SGD) | Unsecured Term Loans
Debt Instrument [Line Items]
Long-term debt, gross	$ 146,876		$ 146,080
Weighted-average interest rate	2.80%		2.76%
2023 and 2024 Term Loan | Canadian dollar (CAD) | Unsecured Term Loans
Debt Instrument [Line Items]
Long-term debt, gross	$ 73,786		$ 72,220
Weighted-average interest rate	2.98%		3.24%
3.750% notes due 2030 | Senior Notes
Debt Instrument [Line Items]
Long-term debt, gross	$ 716,925		$ 510,160
Aggregate principal amount | £		£ 150		£ 400
Interest Rate Swap | Unsecured Term Loans
Debt Instrument [Line Items]
Weighted-average interest rate	2.56%		2.66%
Interest Rate Swap | U.S. dollar ($) | Unsecured Term Loans
Debt Instrument [Line Items]
Weighted-average interest rate	2.44%		2.44%
Interest Rate Swap | Canadian dollar (CAD) | Unsecured Term Loans
Debt Instrument [Line Items]
Weighted-average interest rate	1.78%		1.78%

Debt of the Operating Partner_5

Debt of the Operating Partnership (Narrative) (Details) $ in Millions	Jan. 16, 2019USD ($)	Jan. 16, 2019EUR (€)	Mar. 31, 2019	Mar. 06, 2019EUR (€)
Debt Instrument [Line Items]
Leverage ratio			60.00%
Secured debt leverage ratio, maximum			40.00%
Interest coverage ratio			1.50
Total unencumbered assets			150.00%
Senior Notes | 5.875% notes due 2020 | Digital Realty Trust, L.P.
Debt Instrument [Line Items]
Stated interest rate		5.875%	5.875%
Senior Notes | 2.500% notes due 2026
Debt Instrument [Line Items]
Stated interest rate			2.50%
Senior Notes | 2.500% notes due 2026 | Digital Realty Trust, L.P.
Debt Instrument [Line Items]
Stated interest rate		2.50%	2.50%
Aggregate principal amount		€ 850,000,000		€ 225,000,000
Net proceeds from offering	$ 960.9	€ 843,500,000

Debt of the Operating Partner_6

Debt of the Operating Partnership (Schedule of Debt Maturities And Principal Maturities) (Details) - Digital Realty Trust, L.P. $ in Thousands	Jan. 15, 2016extension	Mar. 31, 2019USD ($)extension	Dec. 31, 2018USD ($)
Debt Instrument [Line Items]
Remainder of 2019		$ 140,713
2020		501,133
2021		400,000
2022		800,000
2023		2,340,982
Thereafter		6,172,373
Subtotal		10,355,201
Unamortized discounts, net of premiums		(18,584)
Unamortized premium		7,188
Long-term debt, net of discount (premium)		10,343,805
Global revolving credit facilities
Debt Instrument [Line Items]
Remainder of 2019		0
2020		0
2021		0
2022		0
2023		684,278
Thereafter		172,933
Subtotal		857,211	$ 1,663,156
Unamortized discounts, net of premiums		0
Unamortized premium		0
Long-term debt, net of discount (premium)		$ 857,211
Number of extension options | extension	2	2
Revolving credit facility commitments extension	6 months	6 months
Unsecured Term Loans
Debt Instrument [Line Items]
Remainder of 2019		$ 0
2020		0
2021		0
2022		0
2023		811,654
Thereafter		0
Subtotal		811,654
Unamortized discounts, net of premiums		0
Unamortized premium		0
Long-term debt, net of discount (premium)		811,654
Senior Notes
Debt Instrument [Line Items]
Remainder of 2019		140,225
2020		500,000
2021		400,000
2022		800,000
2023		741,050
Thereafter		5,999,440
Subtotal		8,580,715
Unamortized discounts, net of premiums		(18,584)
Unamortized premium		7,064
Long-term debt, net of discount (premium)		8,569,195	7,629,679
Secured Debt
Debt Instrument [Line Items]
Remainder of 2019		488
2020		1,133
2021		0
2022		0
2023		104,000
Thereafter		0
Subtotal		105,621
Unamortized discounts, net of premiums		0
Unamortized premium		124	148
Long-term debt, net of discount (premium)		$ 105,745	$ 705,924

Income per Share (Summary of Ba

Income per Share (Summary of Basic and Diluted Earnings per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Earnings Per Share [Abstract]
Net income available to common stockholders	$ 95,869	$ 86,298
Weighted average shares outstanding-basic (shares)	207,809,383	205,714,173
Potentially dilutive common shares:
Unvested incentive units (shares)	323,064	302,016
Forward equity offering (shares)	221,448	0
Market performance-based awards (shares)	172,354	491,287
Weighted average shares/units outstanding-diluted (shares/units)	208,526,249	206,507,476
Income per share:
Basic (in dollars per share)	$ 0.46	$ 0.42
Diluted (in dollars per share)	$ 0.46	$ 0.42

Income per Share (Schedule of A

Income per Share (Schedule of Antidilutive Securities Excluded from Computation of Earnings per Share) (Details) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (shares)	20,522,727	20,668,019
Weighted average of Operating Partnership common units not owned by Digital Realty Trust, Inc.
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (shares)	9,229,911	8,295,287
Potentially dilutive Series C Cumulative Redeemable Perpetual Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (shares)	1,738,781	1,967,430
Potentially dilutive Series G Cumulative Redeemable Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (shares)	2,155,992	2,439,505
Potentially dilutive Series H Cumulative Redeemable Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (shares)	3,159,382	3,574,840
Potentially dilutive Series I Cumulative Redeemable Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (shares)	2,158,515	2,442,359
Potentially dilutive Series J Cumulative Redeemable Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (shares)	1,722,138	1,948,598
Potentially dilutive Series K Cumulative Redeemable Preferred Stock
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (shares)	358,008	0

Income per Unit (Summary of Bas

Income per Unit (Summary of Basic and Diluted Earnings per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Class of Stock [Line Items]
Net income available to common unitholders	$ 95,869	$ 86,298
Weighted average units outstanding-basic (units)	207,809,383	205,714,173
Potentially dilutive common units:
Unvested incentive units (units)	323,064	302,016
Forward equity offering (units)	221,448	0
Market performance-based awards (units)	172,354	491,287
Weighted average shares/units outstanding-diluted (shares/units)	208,526,249	206,507,476
Income per share:
Basic (in dollars per unit)	$ 0.46	$ 0.42
Diluted (in dollars per unit)	$ 0.46	$ 0.42
Digital Realty Trust, L.P.
Class of Stock [Line Items]
Net income available to common unitholders	$ 100,169	$ 89,778
Weighted average units outstanding-basic (units)	217,039,295	214,009,460
Potentially dilutive common units:
Unvested incentive units (units)	323,064	302,016
Forward equity offering (units)	221,448	0
Market performance-based awards (units)	172,354	491,287
Weighted average shares/units outstanding-diluted (shares/units)	217,756,161	214,802,763
Income per share:
Basic (in dollars per unit)	$ 0.46	$ 0.42
Diluted (in dollars per unit)	$ 0.46	$ 0.42

Income per Unit (Schedule of An

Income per Unit (Schedule of Antidilutive Securities Excluded from Computation of Earnings per Share) (Details) - shares	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (units)	20,522,727	20,668,019
Digital Realty Trust, L.P.
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (units)	11,292,816	12,372,732
Digital Realty Trust, L.P. | Potentially dilutive Series C Cumulative Redeemable Perpetual Preferred Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (units)	1,738,781	1,967,430
Digital Realty Trust, L.P. | Potentially dilutive Series G Cumulative Redeemable Preferred Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (units)	2,155,992	2,439,505
Digital Realty Trust, L.P. | Potentially dilutive Series H Cumulative Redeemable Preferred Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (units)	3,159,382	3,574,840
Digital Realty Trust, L.P. | Potentially dilutive Series I Cumulative Redeemable Preferred Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (units)	2,158,515	2,442,359
Digital Realty Trust, L.P. | Potentially dilutive Series J Cumulative Redeemable Preferred Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (units)	1,722,138	1,948,598
Digital Realty Trust, L.P. | Potentially dilutive Series K Cumulative Redeemable Preferred Units
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Potentially dilutive securities (units)	358,008	0

Income Taxes (Narrative) (Detai

Income Taxes (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Percentage of income distributed (at least)	100.00%
Net deferred tax liability	$ 148	$ 146.6

Equity and Accumulated Other _3

Equity and Accumulated Other Comprehensive Loss, Net Equity and Accumulated Other Comprehensive Loss, Net (Equity Distribution Agreements) (Details)	Jan. 04, 2019USD ($)
2019 Equity Distribution Agreements
Class of Stock [Line Items]
Aggregate offering price of the distribution agreement maximum	$ 1,000,000,000

Equity and Accumulated Other _4

Equity and Accumulated Other Comprehensive Loss, Net (Forward Equity Sale) (Details) - Digital Realty Trust, L.P. - USD ($) $ in Billions	Sep. 27, 2019	Sep. 27, 2018
Forward Sale Agreement
Class of Stock [Line Items]
Common stock issued in public offering (shares)		9,775,000
Over-Allotment Option
Class of Stock [Line Items]
Common stock issued in public offering (shares)		1,275,000
Scenario, Forecast | Forward Sale Agreement
Class of Stock [Line Items]
Net proceeds on public offering	$ 1.1

Equity and Accumulated Other _5

Equity and Accumulated Other Comprehensive Loss, Net (5.850% Series K Cumulative Redeemable Preferred Stock) (Details) - USD ($) $ / shares in Units, $ in Millions	Jun. 29, 2019	Mar. 15, 2019	Mar. 13, 2019	Mar. 31, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Preferred stock, issued (shares)				59,050,000	50,650,000
Series K Preferred Stock
Class of Stock [Line Items]
Preferred stock, issued (shares)			8,000,000
Dividend rate percentage			5.85%
Redemption price (in dollars per share)		$ 25		$ 25
Net proceeds from preferred stock			$ 193.7
Preferred stock dividend per share amount (in dollars per share)			$ 1.46250
Share cap (in shares)				0.43611
Series K Preferred Stock | Scenario, Forecast
Class of Stock [Line Items]
Preferred stock dividend per share amount (in dollars per share)	$ 0.43875
Series K Preferred Stock | Over-Allotment Option
Class of Stock [Line Items]
Preferred stock, issued (shares)		400,000
Net proceeds from preferred stock		$ 9.7

Equity and Accumulated Other _6

Equity and Accumulated Other Comprehensive Loss, Net (Noncontrolling Interests in Operating Partnership) (Details) $ in Millions	Mar. 31, 2019USD ($)shares	Dec. 31, 2018USD ($)shares
Class of Stock [Line Items]
Number of units (units)	208,214,139	206,425,656
Percentage of total	95.60%	95.10%
Common stock conversion ratio	1
Ascenty Acquisition
Class of Stock [Line Items]
Issuance of units in connection with Ascenty Acquisition (units)	2,338,874	2,338,874
Percentage of total	1.10%	1.10%
Common units held by third parties
Class of Stock [Line Items]
Common units held by third parties (units)	4,858,794	6,297,272
Percentage of total	2.20%	2.90%
Incentive units held by employees and directors (see Note 13)
Class of Stock [Line Items]
Incentive units held by employees and directors (units)	2,275,791	1,944,738
Percentage of total	1.10%	0.90%
Noncontrolling Interests in Operating Partnership
Class of Stock [Line Items]
Number of units (units)	217,687,598	217,006,540
Percentage of total	100.00%	100.00%
Digital Realty Trust, L.P.
Class of Stock [Line Items]
Common stock conversion ratio	1
Redeemable noncontrolling interests – operating partnership | $	$ 1,070.7	$ 1,076.9

Equity and Accumulated Other _7

Equity and Accumulated Other Comprehensive Loss, Net (Summary of Activity For Noncontrolling Interests in The Operating Partnership) (Details)	3 Months Ended
	Mar. 31, 2019shares
Common and Incentive Unit Activity [Roll Forward]
Beginning balance (units)	10,580,884
Redemption of common units for shares of Digital Realty Trust, Inc. common stock (units)	(1,438,478)
Conversion of incentive units held by employees and directors for shares of Digital Realty Trust, Inc. common stock (units)	(79,398)
Incentive units issued upon achievement of market performance condition (units)	308,308
Grant of incentive units to employees and directors (units)	105,843
Cancellation / forfeitures of incentive units held by employees and directors (units)	(3,700)
Ending balance (units)	9,473,459
Common Units
Common and Incentive Unit Activity [Roll Forward]
Beginning balance (units)	8,636,146
Redemption of common units for shares of Digital Realty Trust, Inc. common stock (units)	(1,438,478)
Conversion of incentive units held by employees and directors for shares of Digital Realty Trust, Inc. common stock (units)	0
Incentive units issued upon achievement of market performance condition (units)	0
Grant of incentive units to employees and directors (units)	0
Cancellation / forfeitures of incentive units held by employees and directors (units)	0
Ending balance (units)	7,197,668
Incentive Units
Common and Incentive Unit Activity [Roll Forward]
Beginning balance (units)	1,944,738
Redemption of common units for shares of Digital Realty Trust, Inc. common stock (units)	0
Conversion of incentive units held by employees and directors for shares of Digital Realty Trust, Inc. common stock (units)	(79,398)
Incentive units issued upon achievement of market performance condition (units)	308,308
Grant of incentive units to employees and directors (units)	105,843
Cancellation / forfeitures of incentive units held by employees and directors (units)	(3,700)
Ending balance (units)	2,275,791

Equity and Accumulated Other _8

Equity and Accumulated Other Comprehensive Loss, Net (Schedule of Dividends) (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)$ / shares
Series C Preferred Stock
Dividends Payable [Line Items]
Preferred stock dividend per share amount (in dollars per share) | $ / shares	$ 1.65625
Series C Preferred Stock | March 29, 2019
Dividends Payable [Line Items]
Dividends, preferred stock | $	$ 3,333
Series G Preferred Stock
Dividends Payable [Line Items]
Preferred stock dividend per share amount (in dollars per share) | $ / shares	$ 1.46875
Series G Preferred Stock | March 29, 2019
Dividends Payable [Line Items]
Dividends, preferred stock | $	$ 3,672
Series H Preferred Stock
Dividends Payable [Line Items]
Preferred stock dividend per share amount (in dollars per share) | $ / shares	$ 1.84375
Series H Preferred Stock | March 29, 2019
Dividends Payable [Line Items]
Dividends, preferred stock | $	$ 6,730
Series I Preferred Stock
Dividends Payable [Line Items]
Preferred stock dividend per share amount (in dollars per share) | $ / shares	$ 1.5875
Series I Preferred Stock | March 29, 2019
Dividends Payable [Line Items]
Dividends, preferred stock | $	$ 3,969
Series J Preferred Stock
Dividends Payable [Line Items]
Preferred stock dividend per share amount (in dollars per share) | $ / shares	$ 1.3125
Series J Preferred Stock | March 29, 2019
Dividends Payable [Line Items]
Dividends, preferred stock | $	$ 2,625
Common Stock
Dividends Payable [Line Items]
Common stock dividend per share amount (in dollars per share) | $ / shares	$ 4.32
Common Stock | March 29, 2019
Dividends Payable [Line Items]
Dividends, common stock | $	$ 224,802

Equity and Accumulated Other _9

Equity and Accumulated Other Comprehensive Loss, Net (Schedule of Accumulated Other Comprehensive Loss, Net) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	$ 10,858,210	$ 11,049,450
Net current period change	4,266
Reclassification of foreign currency translation adjustment due to deconsolidation of Ascenty	21,687	0
Reclassification to interest expense from interest rate swaps	(2,005)
Ending balance	10,982,499	10,936,544
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(158,649)
Net current period change	7,880
Reclassification of foreign currency translation adjustment due to deconsolidation of Ascenty	21,687
Reclassification to interest expense from interest rate swaps	0
Ending balance	(129,082)
Cash flow hedge adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	17,264
Net current period change	(3,614)
Reclassification of foreign currency translation adjustment due to deconsolidation of Ascenty	0
Reclassification to interest expense from interest rate swaps	(2,005)
Ending balance	11,645
Foreign currency net investment hedge adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	25,738
Net current period change	0
Reclassification of foreign currency translation adjustment due to deconsolidation of Ascenty	0
Reclassification to interest expense from interest rate swaps	0
Ending balance	25,738
Accumulated other comprehensive income (loss), net
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(115,647)	(108,432)
Ending balance	$ (91,699)	$ (103,974)

Capital and Accumulated Other_3

Capital and Accumulated Other Comprehensive Loss (5.850% Series K Cumulative Redeemable Preferred Stock) (Details) - $ / shares	Jun. 29, 2019	Mar. 13, 2019	Mar. 31, 2019	Mar. 15, 2019	Dec. 31, 2018
Class of Stock [Line Items]
Preferred stock, issued (shares)			59,050,000		50,650,000
Series K Preferred Units
Class of Stock [Line Items]
Dividend rate percentage		5.85%
Redemption price (in dollars per share)				$ 25
Preferred stock dividend per share amount (in dollars per share)		$ 1.46250
Preferred stock, issued (shares)		8,400,000
Scenario, Forecast | Series K Preferred Units
Class of Stock [Line Items]
Preferred stock dividend per share amount (in dollars per share)	$ 0.43875

Capital and Accumulated Other_4

Capital and Accumulated Other Comprehensive Loss (Forward Equity Sale) (Details) - Digital Realty Trust, L.P. - USD ($) $ in Billions	Sep. 27, 2019	Sep. 27, 2018
Forward Sale Agreement
Class of Stock [Line Items]
Common stock issued in public offering (shares)		9,775,000
Over-Allotment Option
Class of Stock [Line Items]
Common stock issued in public offering (shares)		1,275,000
Scenario, Forecast | Forward Sale Agreement
Class of Stock [Line Items]
Net proceeds on public offering	$ 1.1

Capital and Accumulated Other_5

Capital and Accumulated Other Comprehensive Loss (Partnership Units Narrative) (Details) $ in Millions	Mar. 31, 2019USD ($)	Dec. 31, 2018USD ($)
Class of Stock [Line Items]
Common stock conversion ratio	1
Digital Realty Trust, L.P.
Class of Stock [Line Items]
Common stock conversion ratio	1
Redeemable noncontrolling interests – operating partnership	$ 1,070.7	$ 1,076.9

Capital and Accumulated Other_6

Capital and Accumulated Other Comprehensive Loss (Schedule of Distributions) (Details) - Digital Realty Trust, L.P. $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)$ / shares
Series C Preferred Units
Dividends Payable [Line Items]
Preferred stock dividend per share amount (in dollars per share/unit) | $ / shares	$ 1.65625
Potentially dilutive Series G Cumulative Redeemable Preferred Units
Dividends Payable [Line Items]
Preferred stock dividend per share amount (in dollars per share/unit) | $ / shares	1.46875
Potentially dilutive Series H Cumulative Redeemable Preferred Units
Dividends Payable [Line Items]
Preferred stock dividend per share amount (in dollars per share/unit) | $ / shares	1.84375
Series I Preferred Units
Dividends Payable [Line Items]
Preferred stock dividend per share amount (in dollars per share/unit) | $ / shares	1.5875
Series J Preferred Units
Dividends Payable [Line Items]
Preferred stock dividend per share amount (in dollars per share/unit) | $ / shares	1.3125
Common Units
Dividends Payable [Line Items]
Common stock dividend per share amount (in dollars per share/unit) | $ / shares	$ 4.32
March 29, 2019 | Series C Preferred Units
Dividends Payable [Line Items]
Dividends/Distributions, preferred units | $	$ 3,333
March 29, 2019 | Potentially dilutive Series G Cumulative Redeemable Preferred Units
Dividends Payable [Line Items]
Dividends/Distributions, preferred units | $	3,672
March 29, 2019 | Potentially dilutive Series H Cumulative Redeemable Preferred Units
Dividends Payable [Line Items]
Dividends/Distributions, preferred units | $	6,730
March 29, 2019 | Series I Preferred Units
Dividends Payable [Line Items]
Dividends/Distributions, preferred units | $	3,969
March 29, 2019 | Series J Preferred Units
Dividends Payable [Line Items]
Dividends/Distributions, preferred units | $	2,625
March 29, 2019 | Common Units
Dividends Payable [Line Items]
Dividends/Distributions, common stock/units | $	$ 235,256

Capital and Accumulated Other_7

Capital and Accumulated Other Comprehensive Loss (Schedule of Accumulated Other Comprehensive Loss) (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Net current period change	$ 4,266
Reclassification of foreign currency translation adjustment due to deconsolidation of Ascenty	21,687	$ 0
Reclassification to interest expense from interest rate swaps	(2,005)
Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Net current period change	7,880
Reclassification of foreign currency translation adjustment due to deconsolidation of Ascenty	21,687
Reclassification to interest expense from interest rate swaps	0
Cash flow hedge adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Net current period change	(3,614)
Reclassification of foreign currency translation adjustment due to deconsolidation of Ascenty	0
Reclassification to interest expense from interest rate swaps	(2,005)
Foreign currency net investment hedge adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Net current period change	0
Reclassification of foreign currency translation adjustment due to deconsolidation of Ascenty	0
Reclassification to interest expense from interest rate swaps	0
Digital Realty Trust, L.P.
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	10,858,210	11,049,450
Net current period change	5,418
Reclassification of foreign currency translation adjustment due to deconsolidation of Ascenty	21,687	0
Reclassification to interest expense from interest rate swaps	(2,094)
Ending balance	10,982,499	$ 10,936,544
Digital Realty Trust, L.P. | Foreign currency translation adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(163,531)
Net current period change	9,193
Reclassification of foreign currency translation adjustment due to deconsolidation of Ascenty	21,687
Reclassification to interest expense from interest rate swaps	0
Ending balance	(132,651)
Digital Realty Trust, L.P. | Cash flow hedge adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	16,986
Net current period change	(3,775)
Reclassification of foreign currency translation adjustment due to deconsolidation of Ascenty	0
Reclassification to interest expense from interest rate swaps	(2,094)
Ending balance	11,117
Digital Realty Trust, L.P. | Foreign currency net investment hedge adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	26,152
Net current period change	0
Reclassification of foreign currency translation adjustment due to deconsolidation of Ascenty	0
Reclassification to interest expense from interest rate swaps	0
Ending balance	26,152
Digital Realty Trust, L.P. | Accumulated other comprehensive income (loss), net
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Beginning balance	(120,393)
Ending balance	$ (95,382)

Incentive Plan (Narrative) (Det

Incentive Plan (Narrative) (Details) shares in Millions	Sep. 22, 2017shares	Mar. 31, 2019shares
2004 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Additional shares registered for issuance, 2014 Incentive Award Plan (shares)	3.7
2014 Incentive Award Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of shares remaining for issuance under the Incentive Plan (shares)		6.6
Conversion of units to shares ratio		1

Incentive Plan (Schedule of Def

Incentive Plan (Schedule of Deferred and Unearned Compensation) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Long-term incentive units
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Deferred compensation, expensed	$ 1.4	$ 0.9
Deferred compensation, capitalized	0	$ 0.2
Unearned compensation	21.9		$ 11.5
Expected period to recognize unearned compensation (in years)		2 years 11 months 1 day
Market performance-based awards
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Deferred compensation, expensed	3.1	$ 3.1
Deferred compensation, capitalized	0.2	$ 0.3
Unearned compensation	40.7		24.8
Expected period to recognize unearned compensation (in years)		2 years 7 months 15 days
Restricted stock
Deferred Compensation Arrangement with Individual, Share-based Payments [Line Items]
Deferred compensation, expensed	2.6	$ 1.5
Deferred compensation, capitalized	0.6	$ 1.1
Unearned compensation	$ 39.8		$ 23.6
Expected period to recognize unearned compensation (in years)		3 years 2 months 20 days

Incentive Plan (Summary of Long

Incentive Plan (Summary of Long-Term Incentive Units) (Details)	3 Months Ended
	Mar. 31, 2019$ / sharesshares
Units
Granted (shares)	105,843
Long-term incentive units
Units
Unvested beginning of period (shares)	158,486
Granted (shares)	105,135
Vested (shares)	(50,201)
Unvested end of period (shares)	213,420
Weighted-Average Grant Date Fair Value
Unvested, beginning of period (in dollars per share) | $ / shares	$ 100.94
Granted (in dollars per share) | $ / shares	116.07
Vested (in dollars per share) | $ / shares	81.47
Unvested, end of period (in dollars per share) | $ / shares	$ 98.10
Minimum | Long-term incentive units
Weighted-Average Grant Date Fair Value
Award vesting period	2 years
Maximum | Long-term incentive units
Weighted-Average Grant Date Fair Value
Award vesting period	4 years

Incentive Plan (Market Performa

Incentive Plan (Market Performance Based Awards) (Details) $ in Millions	Feb. 27, 2018	Jan. 31, 2019shares	Mar. 31, 2019USD ($)simulationshares	Mar. 31, 2018USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (shares)			105,843
Market performance-based awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period			3 years
Number of trials | simulation			100,000
Fair value of awards | $			$ 20.3	$ 17.5
Award requisite service period			4 years
Market performance-based awards | Below Threshold Level
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			0.00%
Performance Threshold			(3.00%)
Market performance-based awards | Threshold Level
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			25.00%
Performance Threshold			(3.00%)
Market performance-based awards | Target Level
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			50.00%
Performance Threshold			1.00%
Market performance-based awards | High Level
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			100.00%
Performance Threshold			5.00%
Class D Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (shares)		339,317
Distribution Equivalent Unit
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (shares)		31,009
Restricted Stock Units (RSUs)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vested (shares)		56,778
2015 Performance Grant | Market performance-based awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage	50.00%
2015 Performance Grant | Market performance-based awards | First Vesting Period in February
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			50.00%
2016 Performance Grant | Market performance-based awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period			3 years
2017 Performance Grant | Market performance-based awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Performance period			3 years
2017 Performance Grant | Market performance-based awards | First Vesting Period in February
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			50.00%
2017 Performance Grant | Market performance-based awards | Second Vesting Period in February
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			50.00%
2018 Performance Grant | Market performance-based awards | First Vesting Period in February
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			50.00%
2018 Performance Grant | Market performance-based awards | Second Vesting Period in February
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage			50.00%

Incentive Plan (Assumptions Use

Incentive Plan (Assumptions Used) (Details) - Market performance-based awards	Feb. 21, 2019	Jan. 01, 2019	Mar. 09, 2018	Mar. 01, 2018	Jan. 01, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Expected Stock Price Volatility	23.00%	23.00%	22.00%	22.00%	22.00%
Risk-Free Interest rate	2.48%	2.44%	2.42%	2.34%	1.98%

Incentive Plan (Summary of Rest

Incentive Plan (Summary of Restricted Stock Activity) (Details)	3 Months Ended
	Mar. 31, 2019$ / sharesshares
Units
Granted (shares)	105,843
Restricted stock
Units
Unvested beginning of period (shares)	295,501
Granted (shares)	195,171
Vested (shares)	(94,388)
Cancelled or expired (shares)	(3,724)
Unvested end of period (shares)	392,560
Weighted-Average Grant Date Fair Value
Unvested, beginning of period (in dollars per share) | $ / shares	$ 97.49
Granted (in dollars per share) | $ / shares	114.38
Vested (in dollars per share) | $ / shares	92
Cancelled or expired (in dollars per share) | $ / shares	105.88
Unvested, end of period (in dollars per share) | $ / shares	$ 109.07
Restricted stock | Maximum
Weighted-Average Grant Date Fair Value
Award vesting period	4 years

Derivative Instruments (Outstan

Derivative Instruments (Outstanding Interest Rate Derivatives) (Details) $ in Thousands	Mar. 31, 2019USD ($)$ / $	Dec. 31, 2018USD ($)$ / $
Digital Realty Trust, L.P. | Unsecured Term Loans | Canadian dollar (CAD)
Currently-paying contracts
Exchange rate | $ / $	0.75	0.73
Interest Rate Swap, 1.611
Currently-paying contracts
Notional Amount	$ 206,000	$ 206,000
Strike Rate	1.611%
Interest Rate Swap, 1.611 | Level 2
Currently-paying contracts
Fair value of derivatives	$ 1,311	1,976
Interest Rate Swap, 1.605
Currently-paying contracts
Notional Amount	$ 54,905	54,905
Strike Rate	1.605%
Interest Rate Swap, 1.605 | Level 2
Currently-paying contracts
Fair value of derivatives	$ 343	517
Interest Rate Swap 1.016
Currently-paying contracts
Notional Amount	$ 75,000	75,000
Strike Rate	1.016%
Interest Rate Swap 1.016 | Level 2
Currently-paying contracts
Fair value of derivatives	$ 1,636	2,169
Interest Rate Swap, 1.164
Currently-paying contracts
Notional Amount	$ 75,000	75,000
Strike Rate	1.164%
Interest Rate Swap, 1.164 | Level 2
Currently-paying contracts
Fair value of derivatives	$ 1,456	1,970
Interest Rate Swap, 1.435
Currently-paying contracts
Notional Amount	$ 300,000	300,000
Strike Rate	1.435%
Interest Rate Swap, 1.435 | Level 2
Currently-paying contracts
Fair value of derivatives	$ 7,809	11,463
Interest Rate Swap, 0.779
Currently-paying contracts
Notional Amount	$ 73,786	72,220
Strike Rate	0.779%
Interest Rate Swap, 0.779 | Level 2
Currently-paying contracts
Fair value of derivatives	$ 1,434	2,024
Interest Rate Swap
Currently-paying contracts
Notional Amount	784,691	783,125
Interest Rate Swap | Level 2
Currently-paying contracts
Fair value of derivatives	$ 13,989	$ 20,119

Derivative Instruments (Narrati

Derivative Instruments (Narrative) (Details) $ in Millions	3 Months Ended
	Mar. 31, 2019USD ($)
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Gain (loss) to be reclassified within twelve months	$ 6.2

Fair Value of Financial Instr_3

Fair Value of Financial Instruments (Estimated Fair Value And Carrying Amounts) (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
3.400% notes due 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	3.40%
3.950% notes due 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	3.95%
3.625% notes due 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	3.625%
4.750% notes due 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	4.75%
2.750% notes due 2023
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	2.75%
2.625% notes due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	2.625%
2.750% notes due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	2.75%
4.750% notes due 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	4.75%
4.250% notes due 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	4.25%
Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt	$ 10,654,307	$ 11,236,731
Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt	10,343,805	11,181,880
Global revolving credit facilities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred financing costs	14,200	15,400
Unsecured Term Loans
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred financing costs	3,900	4,200
Senior Notes
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Fair value of long-term debt	11,500	19,900
Deferred financing costs	$ 45,700	40,600
Senior Notes | 3.400% notes due 2020
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	3.40%
Senior Notes | 3.950% notes due 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	3.95%
Senior Notes | 3.625% notes due 2022
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	3.625%
Senior Notes | 2.625% notes due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	2.625%
Senior Notes | 2.750% notes due 2024
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	2.75%
Senior Notes | 4.750% notes due 2025
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Stated interest rate	4.75%
Secured Debt
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred financing costs	$ 300	20,200
Level 2 | Global revolving credit facilities | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Lines of credit	857,211	1,663,156
Level 2 | Global revolving credit facilities | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Lines of credit	857,211	1,663,156
Level 2 | Unsecured Term Loans | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Lines of credit	811,654	1,183,121
Level 2 | Unsecured Term Loans | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Lines of credit	811,654	1,183,121
Level 2 | Senior Notes | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unsecured senior notes	8,879,673	7,684,368
Level 2 | Senior Notes | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Unsecured senior notes	8,569,195	7,629,679
Level 2 | Secured Debt | Estimated Fair Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	105,769	706,086
Level 2 | Secured Debt | Carrying Value
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Mortgage loans	$ 105,745	$ 705,924

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Millions	Mar. 31, 2019USD ($)
Commitments and Contingencies Disclosure [Abstract]
Reimbursable amount of commitments related to construction contracts	$ 22
Commitments related to construction contracts	$ 376.3

Subsequent Events (Details)

Subsequent Events (Details) - Subsequent Event - Series H Preferred Stock $ / shares in Units, shares in Millions, $ in Millions	Apr. 01, 2019USD ($)$ / sharesshares
Subsequent Event [Line Items]
Stock redeemed (in shares) | shares	14.6
Dividend rate percentage	7.375%
Redemption price (in dollars per share) | $ / shares	$ 25
Redemption premium | $	$ 11.7

Uncategorized Items - dlr-20190

Label	Element	Value
Ascenty [Member] | Digital Realty Trust L P [Member]
Equity Issued in Business Combination, Fair Value Disclosure	us-gaap_EquityIssuedInBusinessCombinationFairValueDisclosure	$ 727,439,000
Parent [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	(6,318,000)
Retained Earnings [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (6,318,000)