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Equity (Details) - USD ($)
 3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Jul. 31, 2020
Class of Stock [Line Items]      
Proceeds from Issuance of Common Stock $ 11,000 $ 125,000  
Changes in equity      
Beginning Balance 10,752,174,000 10,990,198,000  
Net income attributable to common stockholders 142,223,000 167,971,000  
Loss on cash flow hedges 0 (17,603,000)  
Cash flow hedge losses reclassified to earnings 2,367,000 1,949,000  
Change in redemption value of redeemable noncontrolling interest (273,000) 471,000  
Noncontrolling interest distribution and income allocation (16,000) (35,000)  
Dividends, Common Stock (221,779,000) (224,083,000)  
Issuance of common stock, net of withholdings (13,078,000) (14,107,000)  
Amortization of deferred compensation 7,286,000 7,781,000  
Ending Balance $ 10,668,904,000 $ 10,912,542,000  
Dividends declared to common stockholders (in dollars per share) $ 1.59 $ 1.59  
Amended 2005 Stock Repurchase Program [Member]      
Changes in equity      
Stock Repurchase Program, Authorized Amount     $ 500,000,000
Common stock      
Changes in equity      
Beginning Balance $ 1,395,000 $ 1,406,000  
Issuance of common stock, net of withholdings 1,000 1,000  
Ending Balance 1,396,000 1,407,000  
Additional paid-in capital      
Changes in equity      
Beginning Balance 10,664,416,000 10,736,733,000  
Issuance of common stock, net of withholdings (14,037,000) (12,492,000)  
Amortization of deferred compensation 7,286,000 7,781,000  
Ending Balance 10,657,665,000 10,732,022,000  
Accumulated earnings less dividends      
Changes in equity      
Beginning Balance 126,022,000 282,913,000  
Net income attributable to common stockholders 142,223,000 167,971,000  
Change in redemption value of redeemable noncontrolling interest (273,000) 471,000  
Dividends, Common Stock (221,779,000) (224,083,000)  
Issuance of common stock, net of withholdings 958,000 (1,616,000)  
Ending Balance 47,151,000 225,656,000  
Accumulated other comprehensive loss      
Changes in equity      
Beginning Balance (40,250,000) (31,503,000)  
Loss on cash flow hedges   (17,603,000)  
Cash flow hedge losses reclassified to earnings 2,367,000 1,949,000  
Ending Balance (37,883,000) (47,157,000)  
Parent [Member]      
Changes in equity      
Beginning Balance 10,751,583,000 10,989,549,000  
Net income attributable to common stockholders 142,223,000 167,971,000  
Loss on cash flow hedges   (17,603,000)  
Cash flow hedge losses reclassified to earnings 2,367,000 1,949,000  
Change in redemption value of redeemable noncontrolling interest (273,000) 471,000  
Dividends, Common Stock (221,779,000) (224,083,000)  
Issuance of common stock, net of withholdings (13,078,000) (14,107,000)  
Amortization of deferred compensation 7,286,000 7,781,000  
Ending Balance 10,668,329,000 10,911,928,000  
Noncontrolling Interest [Member]      
Changes in equity      
Beginning Balance 591,000 649,000  
Noncontrolling interest distribution and income allocation (16,000) (35,000)  
Ending Balance 575,000 $ 614,000  
Continuous Equity Program CEP V [Member]      
Class of Stock [Line Items]      
Proceeds from Issuance of Common Stock $ 0