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Long-Term Debt (Details)
3 Months Ended 6 Months Ended
Jun. 24, 2019
USD ($)
Feb. 15, 2019
USD ($)
Feb. 06, 2019
Feb. 05, 2019
Jan. 16, 2019
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2019
GBP (£)
Jun. 30, 2019
EUR (€)
Debt Instrument [Line Items]                      
Debt costs           $ 37,000,000 $ 0 $ 96,000,000 $ 0    
Senior Notes                      
Debt Instrument [Line Items]                      
Debt instrument, face amount $ 9,000,000,000.0                 £ 1,050,000,000.00 € 1,500,000,000
Redemption price, percentage 101.00%                    
Senior Notes | Senior Notes Due July 2024                      
Debt Instrument [Line Items]                      
Carrying value of debt $ 2,000,000,000.0                    
Debt instrument, interest rate 2.75%                    
Senior Notes | Senior Notes Due July 2026                      
Debt Instrument [Line Items]                      
Carrying value of debt $ 2,000,000,000.0                    
Debt instrument, interest rate 3.20%                    
Senior Notes | Senior Notes Due July 2029                      
Debt Instrument [Line Items]                      
Carrying value of debt $ 3,000,000,000.0                    
Debt instrument, interest rate 3.50%                    
Senior Notes | Senior Notes Due July 2049                      
Debt Instrument [Line Items]                      
Carrying value of debt $ 2,000,000,000.0                    
Debt instrument, interest rate 4.40%                    
Senior Notes | Senior Notes Due July 2023                      
Debt Instrument [Line Items]                      
Carrying value of debt | €                     € 500,000,000
Debt instrument, interest rate           0.375%   0.375%   0.375% 0.375%
Senior Notes | Senior Notes Due July 2027                      
Debt Instrument [Line Items]                      
Carrying value of debt | €                     € 500,000,000
Debt instrument, interest rate           1.125%   1.125%   1.125% 1.125%
Senior Notes | Senior Notes Due July 2030                      
Debt Instrument [Line Items]                      
Carrying value of debt | €                     € 500,000,000
Debt instrument, interest rate           1.625%   1.625%   1.625% 1.625%
Senior Notes | Senior Notes Due July 2025                      
Debt Instrument [Line Items]                      
Carrying value of debt | £                   £ 525,000,000  
Debt instrument, interest rate           2.25%   2.25%   2.25% 2.25%
Senior Notes | Senior Notes Due July 2031                      
Debt Instrument [Line Items]                      
Carrying value of debt | £                   £ 525,000,000  
Debt instrument, interest rate           3.00%   3.00%   3.00% 3.00%
Revolving Credit Facility | Line of Credit                      
Debt Instrument [Line Items]                      
Debt instrument terms for line of credit,debt to income ratio       3.5              
Revolving credit, increase limit   $ 1,500,000,000                  
Extinguishment of debt $ 790,000,000                    
Term Loan Facility | Line of Credit | Senior Unsecured Term Loan Facility                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity   5,000,000,000.0                  
Term Loan Facility | Line of Credit | Senior Unsecured Term Loan Facility, Loans With Three Year Maturity                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity   $ 1,500,000,000                  
Debt term   3 years                  
Term Loan Facility | Line of Credit | Senior Unsecured Term Loan Facility, Loans With Five Year Maturity                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity   $ 3,500,000,000                  
Debt term   5 years                  
Line of Credit | Bridge Loan | Senior Unsecured Bridge Term Loan Facility                      
Debt Instrument [Line Items]                      
Maximum borrowing capacity         $ 17,000,000,000.0            
Debt costs           $ 37,000,000   $ 96,000,000      
Outstanding borrowings           0   0      
Debt term         364 days            
Debt Instrument, Option, One | Revolving Credit Facility | Line of Credit                      
Debt Instrument [Line Items]                      
Debt instrument terms for line of credit,debt to income ratio     4                
Debt Instrument, Option, Two | Revolving Credit Facility | Line of Credit                      
Debt Instrument [Line Items]                      
Debt instrument terms for line of credit,debt to income ratio     4.5                
Debt Instrument, Amortization, Period One | Term Loan Facility | Line of Credit | Senior Unsecured Term Loan Facility                      
Debt Instrument [Line Items]                      
Amortization rate   5.00%                  
Debt Instrument, Amortization, Period Two | Term Loan Facility | Line of Credit | Senior Unsecured Term Loan Facility                      
Debt Instrument [Line Items]                      
Amortization rate   7.50%                  
Debt Instrument, Amortization, Period Three | Term Loan Facility | Line of Credit | Senior Unsecured Term Loan Facility                      
Debt Instrument [Line Items]                      
Amortization rate   10.00%                  
Foreign currency forward exchange contracts                      
Debt Instrument [Line Items]                      
Total fair value of derivatives           2,000,000.0   2,000,000.0      
United Kingdom, Pounds | Foreign currency forward exchange contracts                      
Debt Instrument [Line Items]                      
Notional amount of derivatives           1,340,000,000   1,340,000,000   £ 1,050,000,000.00  
Euro Member Countries, Euro | Foreign currency forward exchange contracts                      
Debt Instrument [Line Items]                      
Notional amount of derivatives           $ 641,000,000   $ 641,000,000     € 563,000,000