Debt - Credit Facility (Details)	9 Months Ended
	Sep. 30, 2020 USD ($) extension	Dec. 31, 2019 USD ($)	Dec. 27, 2019 USD ($)	May 23, 2018 USD ($)
Line of Credit Facility [Line Items]
Outstanding balance	$ 5,885,270,000	$ 5,705,725,000
Credit Facility [Member]
Line of Credit Facility [Line Items]
Outstanding balance	$ 896,630,000	$ 1,045,669,000
Number of extension option | extension	2
Length of extension option	6 months
Credit Facility [Member] | VEREIT Operating Partnership, L.P. [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 2,900,000,000
Outstanding balance	$ 4,000,000.0
Maximum aggregate amount outstanding at any one time	$ 50,000,000.0
Maximum leverage ratio (less than or equal to)	60.00%
Minimum fixed charge coverage ratio (of at least)	1.5
Secured leverage ratio (less than or equal to)	45.00%
Unencumbered asset value ratio (less than or equal to)	60.00%
Minimum unencumbered interest coverage ratio (of at least)	1.75
Credit Facility [Member] | VEREIT Operating Partnership, L.P. [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Commitment fee percentage	0.10%
Credit Facility [Member] | VEREIT Operating Partnership, L.P. [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Commitment fee percentage	0.30%
Credit Facility [Member] | VEREIT Operating Partnership, L.P. [Member] | Revolving Credit Facility [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity			$ 1,500,000,000	2,000,000,000.0
Outstanding balance	$ 0
Credit Facility [Member] | VEREIT Operating Partnership, L.P. [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.775%
Credit Facility [Member] | VEREIT Operating Partnership, L.P. [Member] | Revolving Credit Facility [Member] | LIBOR [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.55%
Credit Facility [Member] | VEREIT Operating Partnership, L.P. [Member] | Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.00%
Credit Facility [Member] | VEREIT Operating Partnership, L.P. [Member] | Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.55%
Credit Facility [Member] | VEREIT Operating Partnership, L.P. [Member] | Revolving Credit Facility [Member] | Federal Funds Rate [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.50%
Credit Facility [Member] | VEREIT Operating Partnership, L.P. [Member] | Revolving Credit Facility [Member] | One Month LIBOR [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.00%
Credit Facility [Member] | VEREIT Operating Partnership, L.P. [Member] | Delayed-Draw Term Loan [Member]
Line of Credit Facility [Line Items]
Maximum borrowing capacity				$ 900,000,000.0
Outstanding balance	$ 900,000,000.0
Credit Facility [Member] | VEREIT Operating Partnership, L.P. [Member] | Delayed-Draw Term Loan [Member] | LIBOR [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.85%
Credit Facility [Member] | VEREIT Operating Partnership, L.P. [Member] | Delayed-Draw Term Loan [Member] | LIBOR [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	1.75%
Credit Facility [Member] | VEREIT Operating Partnership, L.P. [Member] | Delayed-Draw Term Loan [Member] | Base Rate [Member] | Minimum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.00%
Credit Facility [Member] | VEREIT Operating Partnership, L.P. [Member] | Delayed-Draw Term Loan [Member] | Base Rate [Member] | Maximum [Member]
Line of Credit Facility [Line Items]
Basis spread on variable rate	0.75%
Interest Rate Swap [Member] | VEREIT Operating Partnership, L.P. [Member]
Line of Credit Facility [Line Items]
Interest rate	3.59%