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Debt (Narrative) (Details) - USD ($)
Sep. 30, 2021
Jul. 23, 2021
Mar. 22, 2021
Feb. 10, 2021
Oct. 02, 2021
Jan. 02, 2021
Oct. 03, 2020
Mar. 28, 2020
Debt Instrument [Line Items]                
Letters of Credit Outstanding, Amount         $ 0      
Debt Instrument, Unamortized Discount         42,000,000   $ 45,000,000  
Maturities of debt in 2019         1,069,000,000      
Maturities of debt in 2020         440,000,000      
Maturities of debt in 2021         1,279,000,000      
Maturities of debt in 2022         15,000,000      
Maturities of debt in 2023         813,000,000      
3.9% Senior Notes Due September, Two Thousand and Twenty Three [Member]                
Debt Instrument [Line Items]                
Long-term debt, gross         $ 400,000,000   400,000,000  
Debt Instrument, Interest Rate, Stated Percentage         3.90%      
5.1% Notes Due September, Two Thousand and Forty Eight [Member]                
Debt Instrument [Line Items]                
Long-term debt, gross         $ 1,500,000,000   1,500,000,000  
Debt Instrument, Interest Rate, Stated Percentage         5.10%      
Four Point Zero Zero Percentage Senior Unsecured Notes Due March, Two Thousand Twenty Six [Domain]                
Debt Instrument [Line Items]                
Long-term debt, gross         $ 800,000,000   800,000,000  
Debt Instrument, Interest Rate, Stated Percentage         4.00%      
Four Point Three Five Percentage Senior Unsecured Notes Due March Two Thousand And Twenty Nine [Member] [Domain]                
Debt Instrument [Line Items]                
Long-term debt, gross         $ 1,000,000,000   1,000,000,000  
Debt Instrument, Interest Rate, Stated Percentage         4.35%      
Term Loan Facility Due March 2022 [Domain]                
Debt Instrument [Line Items]                
Long-term debt, gross         $ 0   1,500,000,000  
Term Loan Facility Due March 2022                
Debt Instrument [Line Items]                
Long-term debt, gross       $ 750,000,000   $ 1,500,000,000    
Extinguishment of Debt, Amount     $ 250,000,000 $ 750,000,000        
Debt Instrument, Unused Borrowing Capacity, Amount               $ 1,500,000,000
Term Loan Facility Due March 2023                
Debt Instrument [Line Items]                
Long-term debt, gross     $ 500,000,000          
Extinguishment of Debt, Amount $ 500,000,000              
2.25% Notes due August 2021                
Debt Instrument [Line Items]                
Long-term debt, gross         $ 0   500,000,000  
Extinguishment of Debt, Amount   $ 500,000,000            
Debt Instrument, Interest Rate, Stated Percentage         2.25%      
Revolving Credit Facility [Member]                
Debt Instrument [Line Items]                
Maximum borrowing capacity $ 1,750,000,000       $ 2,250,000,000      
Amount available for borrowing under credit facility         2,250,000,000      
Revolving credit facility         0   0  
Revolving Credit Facility Incremental Commitment Increase         500,000,000      
Standby Letters of Credit [Member]                
Debt Instrument [Line Items]                
Letters of Credit Outstanding, Amount         0      
Bilateral Letters Of Credit [Member]                
Debt Instrument [Line Items]                
Letters of Credit Outstanding, Amount         94,000,000      
Commercial Paper [Member]                
Debt Instrument [Line Items]                
Maximum borrowing capacity         1,000,000,000      
Commercial Paper         $ 0   $ 0