XML 78 R54.htm IDEA: XBRL DOCUMENT v3.8.0.1
Borrowings (Textual) (Details) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Debt Instrument [Line Items]      
Notes Payable $ 4,500,000,000 $ 4,499,700,000  
Average interest rate (percentage) 3.60%    
Fixed Rate Debt      
Debt Instrument [Line Items]      
Notes Payable $ 3,724,800,000 3,838,300,000  
Mortgages      
Debt Instrument [Line Items]      
Repayments of Debt 156,400,000    
Floating Rate Debt      
Debt Instrument [Line Items]      
Notes Payable $ 790,000,000 650,000,000  
Variable Rate Debt [Member]      
Debt Instrument [Line Items]      
Average interest rate (percentage) 2.30%    
Unsecured Debt $ 300,000,000    
Unsecured Debt      
Debt Instrument [Line Items]      
Notes Payable $ 3,525,765,000    
Average interest rate (percentage) 3.50%    
Unsecured Debt | $1 billion unsecured revolving credit facility [Member]      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity $ 1,000,000,000    
Line of credit facility, amount outstanding $ 410,000,000    
Unsecured Debt | $1 billion unsecured revolving credit faciltiy [Member]      
Debt Instrument [Line Items]      
Average interest rate (percentage) 2.47%    
Letters of credit outstanding amount $ 2,500,000    
Unsecured Debt | Fixed Rate Debt      
Debt Instrument [Line Items]      
Notes Payable $ 2,292,000,000 1,860,000,000  
Average interest rates (percent) 3.97%    
Unsecured Debt | Floating Rate Debt      
Debt Instrument [Line Items]      
Notes Payable [1] $ 710,000,000 490,000,000  
Average interest rates (percent) [1] 2.41%    
Unsecured Debt | KeyBank Term Loan [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 150,000,000    
Unsecured Debt | Wells Fargo Term Loan [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount 300,000,000    
Unsecured Debt | Wells Fargo Term Loan 2018 [Domain]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount 250,000,000    
Unsecured Debt | US Bank Term Loan [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 150,000,000    
Unsecured Debt | Term Loan [Member]      
Debt Instrument [Line Items]      
Average interest rate (percentage) 3.00%    
Debt Instrument, Face Amount $ 550,000,000    
Unsecured Debt | 2011 and 2012 Senior Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount $ 292,000,000    
Unsecured Debt | 3.6% Notes due 2027 [Member]      
Debt Instrument [Line Items]      
Average interest rate (percentage) 3.68%    
Proceeds from Unsecured Notes Payable $ 593,600,000    
Settlement of Forward Swaps $ 300,000,000    
Interest rate, stated percentage 3.60%    
Debt Instrument, Issue Price 99.58%    
Debt Instrument, Unamortized Discount, Current $ 2,500,000    
Other Underwriting Expense 3,900,000    
Debt Instrument, Face Amount $ 600,000,000    
Unsecured Debt | Minimum | $1 billion unsecured revolving credit facility [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 0.85%    
Unsecured Debt | Minimum | Floating Rate Debt      
Debt Instrument [Line Items]      
Interest rate, stated percentage [1] 2.31%    
Unsecured Debt | Minimum | KeyBank Term Loan [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 0.90%    
Unsecured Debt | Minimum | Wells Fargo Term Loan [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 0.90%    
Unsecured Debt | Minimum | US Bank Term Loan [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 0.90%    
Unsecured Debt | Minimum | Term Loan [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 0.90%    
Unsecured Debt | Maximum | $1 billion unsecured revolving credit facility [Member]      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity $ 1,500,000,000    
Debt Instrument, Basis Spread on Variable Rate 1.55%    
Unsecured Debt | Maximum | Floating Rate Debt      
Debt Instrument [Line Items]      
Interest rate, stated percentage [1] 2.47%    
Unsecured Debt | Maximum | KeyBank Term Loan [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 1.75%    
Unsecured Debt | Maximum | Wells Fargo Term Loan [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 1.90%    
Unsecured Debt | Maximum | US Bank Term Loan [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 1.90%    
Unsecured Debt | Maximum | Term Loan [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Basis Spread on Variable Rate 1.75%    
Unsecured Debt | Variable Rate Debt [Member] | $1 billion unsecured revolving credit faciltiy [Member]      
Debt Instrument [Line Items]      
Average interest rate (percentage) 2.50%    
Line of credit facility, amount outstanding $ 410,000,000    
Unsecured Debt | Fixed Rate Debt      
Debt Instrument [Line Items]      
Debt Instrument, Term 6 years 10 months 15 days    
Unsecured Debt | Fixed Rate Debt | Senior Notes      
Debt Instrument [Line Items]      
Average interest rate (percentage) 4.00%    
Debt Instrument, Face Amount $ 2,292,000,000    
Unsecured Debt | Fixed Rate Debt | Public Income Notes [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount 2,000,000,000    
Unsecured Debt | Fixed Rate Debt | Private Placement [Member]      
Debt Instrument [Line Items]      
Debt Instrument, Face Amount 0    
Debt Instrument, Decrease, Forgiveness $ 18,000,000    
Unsecured Debt | Fixed Rate Debt | Minimum      
Debt Instrument [Line Items]      
Debt Instrument, Term 7 years    
Unsecured Debt | Fixed Rate Debt | Maximum      
Debt Instrument [Line Items]      
Debt Instrument, Term 12 years    
Secured Debt [Member]      
Debt Instrument [Line Items]      
Average interest rate (percentage) 3.80%    
Secured Debt [Member] | FNMA      
Debt Instrument [Line Items]      
Line of credit facility, maximum borrowing capacity $ 80,000,000    
Line of credit facility, amount outstanding 80,000,000    
Line of Credit Facility, Current Borrowing Capacity 80,000,000    
Secured Debt [Member] | Amortization Other [Member] | Mortgages      
Debt Instrument [Line Items]      
Mortgage Loans on Real Estate $ 12,000,000    
Secured Debt [Member] | Variable Rate Debt [Member] | FNMA      
Debt Instrument [Line Items]      
Average interest rate (percentage) 1.80%    
Secured Debt [Member] | Fixed Rate Debt | Mortgages      
Debt Instrument [Line Items]      
Average interest rate (percentage) 4.00%    
Mortgage Loans on Real Estate $ 882,752,000    
Parent Company [Member]      
Debt Instrument [Line Items]      
Unsecured Debt 3,525,765,000 3,180,624,000  
Proceeds from notes payable 597,480,000 $ 300,000,000 $ 395,960,000
Grand Cypress [Member] | Mortgages      
Debt Instrument [Line Items]      
Mortgage Loans on Real Estate 15,800,000    
Venue at Stonebridge Ranch [Member] | Mortgages      
Debt Instrument [Line Items]      
Mortgage Loans on Real Estate 13,900,000    
La Valencia At Starwood | Mortgages      
Debt Instrument [Line Items]      
Mortgage Loans on Real Estate 20,100,000    
Colonial Grand at Trinity Commons [Member] | Mortgages      
Debt Instrument [Line Items]      
Mortgage Loans on Real Estate 27    
Line of Credit Facility, Draws [Member] | Secured Debt [Member] | FNMA      
Debt Instrument [Line Items]      
Line of credit facility, amount outstanding 805,000,000    
Line of Credit [Member] | Secured Debt [Member] | FNMA      
Debt Instrument [Line Items]      
Line of credit facility, amount outstanding $ 885,000,000    
[1] Amounts are adjusted to reflect interest rate swap and cap agreements in effect at December 31, 2017, and 2016, respectively, which results in paying fixed interest payments over the terms of the interest rate swaps and on changes in interest rates above the strike rate of the cap.