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Debt (Details) - USD ($)
3 Months Ended 12 Months Ended
Mar. 12, 2018
Nov. 10, 2017
Mar. 10, 2017
Dec. 05, 2016
Sep. 23, 2016
Jul. 26, 2016
Dec. 14, 2015
Jun. 03, 2013
Feb. 03, 2018
Nov. 03, 2018
Oct. 28, 2017
Oct. 29, 2016
Debt Instrument [Line Items]                        
Aggregate principal amount of debt                   $ 6,375,000,000 $ 7,900,000,000  
Semi-annual fixed interest payments       semi-annual fixed interest payments due on June 5 and December 5 of each year, commencing June 5, 2017                
364-day senior unsecured bridge facility maximum aggregate principal amount           $ 7,500,000,000            
90-day senior unsecured bridge facility maximum aggregate principal amount     $ 4,100,000,000                  
3-year unsecured term loan facility principal amount         $ 2,500,000,000              
5-year unsecured term loan facility principal amount         2,500,000,000              
Debt issuance costs, net         11,500,000              
Repayments of debt                   2,275,000,000 5,050,000,000 $ 0
Proceeds from debt                   743,778,000 11,156,164,000 $ 1,235,331,000
Debt, current                   $ 67,000,000    
2.875% Senior unsecured notes due June 1, 2023 [Member]                        
Debt Instrument [Line Items]                        
Maturity date of senior unsecured notes               Jun. 01, 2023        
Semi-annual fixed interest payments               semi-annual fixed interest payments due on June 1 and December 1 of each year, commencing December 1, 2013        
Net proceeds of notes offering               $ 493,900,000        
Senior Notes [Member] | 3.0% Senior unsecured notes due April 15, 2016 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, covenant compliance                   compliant with these covenants    
Senior Notes [Member] | 3.9% Senior unsecured notes due December 15, 2025 [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, covenant compliance                   compliant with these covenants    
Senior Notes [Member] | Senior unsecured notes due December 5, 2021, December 5, 2023, December 5, 2026 and December 5, 2036 [Member]                        
Debt Instrument [Line Items]                        
Net proceeds of notes offering       $ 2,100,000,000                
3.9% Senior unsecured notes due December 15, 2025 [Member]                        
Debt Instrument [Line Items]                        
Maturity date of senior unsecured notes             Dec. 15, 2025          
Semi-annual fixed interest payments                   semi-annual fixed interest payments due on June 15 and December 15 of each year, commencing June 15, 2016    
Net proceeds of notes offering             $ 1,200,000,000          
5.3% Senior unsecured notes due December 15, 2045 [Member]                        
Debt Instrument [Line Items]                        
Maturity date of senior unsecured notes                   Dec. 15, 2045    
Bridge Loan [Member]                        
Debt Instrument [Line Items]                        
Unamortized bridge fees                 $ 7,200,000   13,700,000  
Bridge Loan [Member] | Senior Unsecured Bridge Facility, Ninety Days [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, term     90 days     90 days            
Bridge Loan [Member] | Senior Unsecured Bridge Facility, Three Hundred Sixty Four Days [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, term           364 days            
Debt related commitment fees and debt issuance costs       27,500,000                
Bridge financing commitments       2,500,000,000.0 $ 5,000,000,000              
Bridge Loan [Member] | Unsecured Bridge Facility, Ninety Days, Agreement Due June 2017 [Member]                        
Debt Instrument [Line Items]                        
Debt related commitment fees and debt issuance costs     $ 15,000,000                  
Repayments of unsecured debt     $ 4,100,000,000                  
Unsecured Debt [Member]                        
Debt Instrument [Line Items]                        
Proceeds from debt, net of issuance costs $ 743,800,000                      
Unsecured Debt [Member] | Unsecured Term Loan, Three Year [Member]                        
Debt Instrument [Line Items]                        
Aggregate principal amount of debt                   $ 425,000,000 $ 1,950,000,000  
Debt instrument, term     3 years   3 years         3 years    
Repayments of unsecured debt                   $ 550,000,000    
Repayments of debt   $ 300,000,000               $ 1,200,000    
Unsecured Debt [Member] | Unsecured Term Loan, Five Year [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, term   5 years 5 years   5 years         5 years    
Repayments of unsecured debt                   $ 400,000,000    
Repayments of debt                   $ 750,000,000    
Unsecured Debt [Member] | Senior 2.850% Unsecured Notes Due March 2020 [Member]                        
Debt Instrument [Line Items]                        
Interest rate to be paid on long term notes 2.85%                      
Maturity date of senior unsecured notes Mar. 12, 2020                      
Proceeds from debt $ 300,000,000.0                      
Unsecured Debt [Member] | Senior 2.950% Unsecured Notes Due January 2021 [Member]                        
Debt Instrument [Line Items]                        
Interest rate to be paid on long term notes 2.95%                      
Maturity date of senior unsecured notes Jan. 12, 2021                      
Debt instrument, covenant compliance                   compliance with these covenants    
Proceeds from debt $ 450,000,000.0                      
Senior 2.5% Unsecured Notes Due December 5,2021 [Member]                        
Debt Instrument [Line Items]                        
Aggregate principal amount of debt       $ 400,000,000                
Interest rate to be paid on long term notes       2.50%                
Maturity date of senior unsecured notes       Dec. 05, 2021                
Senior 3.125% Unsecured Notes Due December 5, 2023 [Member]                        
Debt Instrument [Line Items]                        
Aggregate principal amount of debt       $ 550,000,000                
Interest rate to be paid on long term notes       3.125%                
Maturity date of senior unsecured notes       Dec. 05, 2023                
Senior 3.500% Unsecured Notes Due December 5, 2026 [Member]                        
Debt Instrument [Line Items]                        
Aggregate principal amount of debt       $ 900,000,000                
Interest rate to be paid on long term notes       3.50%                
Maturity date of senior unsecured notes       Dec. 05, 2026                
Senior 4.500% Unsecured Notes Dues December 5, 2036 [Member]                        
Debt Instrument [Line Items]                        
Aggregate principal amount of debt       $ 250,000,000                
Interest rate to be paid on long term notes       4.50%                
Maturity date of senior unsecured notes       Dec. 05, 2036                
Fair Value, Measurements, Nonrecurring [Member] | 2.875% Senior unsecured notes due June 1, 2023 [Member]                        
Debt Instrument [Line Items]                        
Aggregate principal amount of debt               $ 500,000,000        
Interest rate to be paid on long term notes               2.875%        
Fair Value, Measurements, Nonrecurring [Member] | 10 year US Treasury rate of 1.7845% [Member]                        
Debt Instrument [Line Items]                        
Interest rate to be paid on long term notes               1.7845%        
Fair Value, Measurements, Nonrecurring [Member] | 3.9% Senior unsecured notes due December 15, 2025 [Member]                        
Debt Instrument [Line Items]                        
Aggregate principal amount of debt             $ 850,000,000.0          
Interest rate to be paid on long term notes             3.90%          
Fair Value, Measurements, Nonrecurring [Member] | 5.3% Senior unsecured notes due December 15, 2045 [Member]                        
Debt Instrument [Line Items]                        
Aggregate principal amount of debt             $ 400,000,000          
Interest rate to be paid on long term notes             5.30%          
Eurodollar [Member] | Minimum [Member] | Unsecured Debt [Member] | Unsecured Term Loan, Three Year [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, basis spread on variable rate                   0.75%    
Eurodollar [Member] | Minimum [Member] | Unsecured Debt [Member] | Unsecured Term Loan, Five Year [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, basis spread on variable rate                   0.875%    
Eurodollar [Member] | Maximum [Member] | Unsecured Debt [Member] | Unsecured Term Loan, Three Year [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, basis spread on variable rate                   1.625%    
Eurodollar [Member] | Maximum [Member] | Unsecured Debt [Member] | Unsecured Term Loan, Five Year [Member]                        
Debt Instrument [Line Items]                        
Debt instrument, basis spread on variable rate                   1.75%