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Long-Term Debt - Narrative (Details)
12 Months Ended
Sep. 28, 2018
USD ($)
Sep. 29, 2015
USD ($)
Dec. 31, 2018
USD ($)
note
Oct. 29, 2018
USD ($)
Jun. 13, 2018
USD ($)
Apr. 30, 2018
USD ($)
Mar. 07, 2018
USD ($)
Sep. 14, 2017
USD ($)
Jun. 09, 2017
USD ($)
Debt Instrument [Line Items]                  
Bank note, maximum issuable amount $ 20,000,000,000 $ 20,000,000,000              
Senior notes available for future issuance     $ 20,000,000,000            
Number of notes issued | note     0            
Senior Notes [Member]                  
Debt Instrument [Line Items]                  
Original maturity of bank note 7 days 7 days              
Subordinated Notes [Member]                  
Debt Instrument [Line Items]                  
Original maturity of bank note 5 years 5 years              
2.40% Senior Bank Notes Due 2022 [Member]                  
Debt Instrument [Line Items]                  
Issuance of senior notes                 $ 600,000,000
Debt instrument interest rate                 2.40%
2.30% Senior Bank Notes Due 2022 [Member]                  
Debt Instrument [Line Items]                  
Issuance of senior notes               $ 750,000,000  
Debt instrument interest rate               2.30%  
3.375% Senior Notes Due 2023 [Member]                  
Debt Instrument [Line Items]                  
Issuance of senior notes             $ 500,000,000    
Debt instrument interest rate             3.375%    
3.35% Senior Notes Due 2021 [Member]                  
Debt Instrument [Line Items]                  
Issuance of senior notes         $ 500,000,000        
Debt instrument interest rate         3.35%        
Medium-Term Notes [Member]                  
Debt Instrument [Line Items]                  
Debt term     9 months            
Additional debt securities authorized and available for issuance under note program     $ 2,750,000,000            
4.10% Senior Notes Due 2028 [Member]                  
Debt Instrument [Line Items]                  
Issuance of senior notes           $ 750,000,000      
Debt instrument interest rate           4.10%      
4.150% Senior Notes Due 2025 [Member]                  
Debt Instrument [Line Items]                  
Issuance of senior notes       $ 500,000,000          
Debt instrument interest rate       4.15%