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Leases - Cash Flows (Details) - USD ($)
$ in Millions
9 Months Ended
Sep. 26, 2020
Sep. 28, 2019
Supplemental cash flow information:    
Net cash used for operating activities related to operating leases $ 116 $ 110
Net cash used for operating activities related to finance leases 1 1
Net cash used for financing activities related to finance leases 9 11
Assets obtained in exchange for lease liabilities:    
Operating leases $ 64 $ 69