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Debt - Private Placement Facilities (Details) - Private placement facilities [Member]
$ in Billions
12 Months Ended
Dec. 30, 2017
USD ($)
Debt Instrument [Line Items]  
Debt Instrument Maximum Borrowing Capacity $ 1
Debt Instrument, Maturity Date Sep. 15, 2020
Minimum [Member]  
Debt Instrument [Line Items]  
Term of issuances under private placement facilities 5 years
Maximum [Member]  
Debt Instrument [Line Items]  
Term of issuances under private placement facilities 15 years
Average term of issuances under private placement facilities 12 years