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Supplemental Financial Statement Data (Allowance for doubtful accounts) (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Jan. 03, 2015
Dec. 28, 2013
Dec. 29, 2012
Supplemental Financial Statement Data [Abstract]      
Balance at beginning of year $ 5us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 6us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 8us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent
Additions charged to expense 6us-gaap_ProvisionForDoubtfulAccounts 2us-gaap_ProvisionForDoubtfulAccounts 1us-gaap_ProvisionForDoubtfulAccounts
Doubtful accounts charged to reserve (4)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (3)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs (3)us-gaap_AllowanceForDoubtfulAccountsReceivableWriteOffs
Balance at end of year $ 7us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 5us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent $ 6us-gaap_AllowanceForDoubtfulAccountsReceivableCurrent