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Notes Payable - General (Details)
 1 Months Ended
Jan. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2021
GBP (£)
Dec. 31, 2020
USD ($)
Dec. 31, 2020
GBP (£)
Oct. 31, 2020
GBP (£)
Jul. 31, 2020
USD ($)
May 31, 2020
USD ($)
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2015
USD ($)
Oct. 31, 2012
USD ($)
Jun. 30, 2011
USD ($)
Mar. 31, 2005
USD ($)
3.250% notes, issued in May 2020 and due in January 2031                            
Debt                            
Face amount of notes               $ 600,000,000            
3.250% notes, issued in July 2020 and due in January 2031                            
Debt                            
Face amount of notes             $ 350,000,000              
Notes and bonds payable                            
Debt                            
Total principal amount   $ 7,360,000,000   $ 8,303,000,000                    
Unamortized net original issuance premiums and deferred financing costs   (34,000,000)   (35,000,000)                    
Net payable amount   7,326,000,000   8,268,000,000                    
Notes and bonds payable | 3.250% notes, $450 issued in October 2012 and $500 issued in December 2017, both due in October 2022                            
Debt                            
Total principal amount   $ 0   950,000,000                    
Interest rate (as a percent) 3.25% 3.25% 3.25%                      
Early redemption of notes payable $ 950,000,000.0                          
Notes and bonds payable | 3.250% notes, issued in October 2012 and due in October 2022                            
Debt                            
Face amount of notes                       $ 450,000,000    
Notes and bonds payable | 3.250% notes, issued in December 2017 and due in October 2022                            
Debt                            
Face amount of notes                 $ 500,000,000          
Notes and bonds payable | 4.650% notes, issued in July 2013 and due in August 2023                            
Debt                            
Total principal amount   $ 750,000,000   750,000,000                    
Interest rate (as a percent)   4.65% 4.65%                      
Notes and bonds payable | 3.875% notes, issued in June 2014 and due in July 2024                            
Debt                            
Total principal amount   $ 350,000,000   350,000,000                    
Interest rate (as a percent)   3.875% 3.875%                      
Notes and bonds payable | 3.875% notes, issued in April 2018 and due in April 2025                            
Debt                            
Total principal amount   $ 500,000,000   500,000,000                    
Interest rate (as a percent)   3.875% 3.875%                      
Notes and bonds payable | 0.750% notes, issued in December 2020 and due in March 2026                            
Debt                            
Total principal amount   $ 325,000,000   325,000,000                    
Interest rate (as a percent)   0.75% 0.75%                      
Notes and bonds payable | 4.125% notes, $250 issued in September 2014 and $400 issued in March 2017, both due in October 2026                            
Debt                            
Total principal amount   $ 650,000,000   650,000,000                    
Interest rate (as a percent)   4.125% 4.125%                      
Notes and bonds payable | 4.125% notes, issued in September 2014 and due in October 2026                            
Debt                            
Face amount of notes                     $ 250,000,000      
Notes and bonds payable | 4.125% notes, issued in March 2017 and due in October 2026                            
Debt                            
Face amount of notes                   $ 400,000,000        
Notes and bonds payable | 3.000% notes, issued in October 2016 and due in January 2027                            
Debt                            
Total principal amount   $ 600,000,000   600,000,000                    
Interest rate (as a percent)   3.00% 3.00%                      
Notes and bonds payable | 3.650% notes, issued in December 2017 and due in January 2028                            
Debt                            
Total principal amount   $ 550,000,000   550,000,000                    
Interest rate (as a percent)   3.65% 3.65%                      
Notes and bonds payable | 3.250% notes, issued in June 2019 and due in June 2029                            
Debt                            
Total principal amount   $ 500,000,000   500,000,000                    
Interest rate (as a percent)   3.25% 3.25%                      
Notes and bonds payable | 1.625% notes, issued in October 2020 and due in December 2030                            
Debt                            
Total principal amount   $ 551,000,000 £ 400,000,000.0 547,000,000 £ 400,000,000.0                  
Interest rate (as a percent)   1.625% 1.625%     1.625%                
Face amount of notes | £           £ 400,000,000                
Notes and bonds payable | 3.250% notes, $600 issued in May 2020 and $350 issued in July 2020, both due in January 2031                            
Debt                            
Total principal amount   $ 950,000,000   950,000,000                    
Interest rate (as a percent)   3.25% 3.25%                      
Notes and bonds payable | 1.800% notes, issued in December 2020 and due in March 2033                            
Debt                            
Total principal amount   $ 400,000,000   400,000,000                    
Interest rate (as a percent)   1.80% 1.80%                      
Notes and bonds payable | 2.730% notes, issued in May 2019 and due in May 2034                            
Debt                            
Total principal amount   $ 434,000,000 £ 315,000,000.0 431,000,000 £ 315,000,000.0                  
Interest rate (as a percent)   2.73% 2.73%                      
Notes and bonds payable | 5.875% bonds, $100 issued in March 2005 and $150 issued in June 2011, both due in March 2035                            
Debt                            
Total principal amount   $ 250,000,000   250,000,000                    
Interest rate (as a percent)   5.875% 5.875%                      
Notes and bonds payable | 5.875% bonds, issued in March 2005 and due in March 2035                            
Debt                            
Face amount of notes                           $ 100,000,000
Notes and bonds payable | 5.875% bonds, issued in June 2011 and due in March 2035                            
Debt                            
Face amount of notes                         $ 150,000,000  
Notes and bonds payable | 4.650% notes, $300 issued in March 2017 and $250 issued in December 2017, both due in March 2047                            
Debt                            
Total principal amount   $ 550,000,000   $ 550,000,000                    
Interest rate (as a percent)   4.65% 4.65%                      
Notes and bonds payable | 4.650% notes, issued in March 2017 and due in March 2047                            
Debt                            
Face amount of notes                   $ 300,000,000        
Notes and bonds payable | 4.650% notes, issued in December 2017 and due in March 2047                            
Debt                            
Face amount of notes                 $ 250,000,000