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Income Taxes (Activity Related To Gross Unrecognized Tax Benefits) (Details) - USD ($)
$ in Millions
12 Months Ended
Sep. 30, 2017
Oct. 01, 2016
Oct. 03, 2015
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]      
Balance as of the beginning of the year $ 305 $ 306 $ 272
Increases related to current year tax positions 38 35 78
Increases related to prior year tax positions 5 31 11
Increase related to AdvancePierre acquisition 9 0 0
Reductions related to prior year tax positions (27) (48) (18)
Reductions related to settlements (4) (7) 0
Reductions related to expirations of statute of limitations (10) (12) (37)
Balance as of the end of the year $ 316 $ 305 $ 306