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Debt (Narrative) (Details) (USD $)
3 Months Ended
Mar. 29, 2015
Mar. 30, 2014
Dec. 28, 2014
Debt Instrument [Line Items]      
Long-term debt $ 13,626,000,000us-gaap_LongTermDebt   $ 13,597,000,000us-gaap_LongTermDebt
Debt covenant, leverage ratio threshold 50,000,000hnz_DebtInstrumentCovenantComplianceLeverageRatioThreshold    
Debt issuance cost 66,000,000us-gaap_DebtIssuanceCosts    
Amortization of deferred debt issuance costs 10,000,000us-gaap_AmortizationOfFinancingCosts 12,000,000us-gaap_AmortizationOfFinancingCosts  
Write off of deferred debt issuance cost 32,000,000us-gaap_WriteOffOfDeferredDebtIssuanceCost    
Write off of Deferred Debt Issuance Cost, Excluding Debt Discounts 26,000,000hnz_WriteoffofDeferredDebtIssuanceCostExcludingDebtDiscounts    
Write off of Deferred Debt Issuance Cost, Debt Discount 7,000,000hnz_WriteoffofDeferredDebtIssuanceCostDebtDiscount    
Maximum      
Debt Instrument [Line Items]      
Debt collateral limit, capital stock of foreign subsidiaries, percent 65.00%hnz_DebtInstrumentCollateralCapitalStockForeignSubsidiariesPercent
/ us-gaap_RangeAxis
= us-gaap_MaximumMember
   
Japanese Yen Credit Agreement Due July 2015      
Debt Instrument [Line Items]      
Maturity period 3 years    
$2.95 billion Term B-1 Loan      
Debt Instrument [Line Items]      
Long-term debt 2,122,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hnz_TermB1LoanMember
  2,769,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hnz_TermB1LoanMember
Repayments of debt 650,000,000us-gaap_RepaymentsOfDebt
/ us-gaap_DebtInstrumentAxis
= hnz_TermB1LoanMember
   
$6.55 billion Term B-2 Loan      
Debt Instrument [Line Items]      
Long-term debt 4,283,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hnz_TermB2LoanMember
  5,588,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hnz_TermB2LoanMember
Repayments of debt 1,310,000,000us-gaap_RepaymentsOfDebt
/ us-gaap_DebtInstrumentAxis
= hnz_TermB2LoanMember
   
4.25% Second Lien Senior Notes      
Debt Instrument [Line Items]      
Long-term debt 3,100,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hnz_A4.25SeniorNotesDue2020Member
  3,100,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hnz_A4.25SeniorNotesDue2020Member
Stated interest rate 4.25%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hnz_A4.25SeniorNotesDue2020Member
   
4.875% Second Lien Senior Notes Due 2025      
Debt Instrument [Line Items]      
Long-term debt 2,000,000,000us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hnz_A4.875SecondLienSeniorNotesDue2025MemberDomain
  0us-gaap_LongTermDebt
/ us-gaap_DebtInstrumentAxis
= hnz_A4.875SecondLienSeniorNotesDue2025MemberDomain
Stated interest rate 4.875%us-gaap_DebtInstrumentInterestRateStatedPercentage
/ us-gaap_DebtInstrumentAxis
= hnz_A4.875SecondLienSeniorNotesDue2025MemberDomain
   
Debt issuance cost 16,000,000us-gaap_DebtIssuanceCosts
/ us-gaap_DebtInstrumentAxis
= hnz_A4.875SecondLienSeniorNotesDue2025MemberDomain
   
Senior Credit Facilities | $2.95 billion Term B-1 Loan      
Debt Instrument [Line Items]      
Maximum borrowing capacity 3,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= hnz_TermB1LoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember
   
Senior Credit Facilities | $6.55 billion Term B-2 Loan      
Debt Instrument [Line Items]      
Maximum borrowing capacity 6,600,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= hnz_TermB2LoanMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember
   
Senior Credit Facilities | Term B-1 and B-2 Loans      
Debt Instrument [Line Items]      
Maximum borrowing capacity 9,500,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_DebtInstrumentAxis
= hnz_TermB1andB2LoansMember
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_SeniorDebtObligationsMember
   
Revolving Credit Facility      
Debt Instrument [Line Items]      
Maximum borrowing capacity $ 2,000,000,000us-gaap_LineOfCreditFacilityMaximumBorrowingCapacity
/ us-gaap_LongtermDebtTypeAxis
= us-gaap_RevolvingCreditFacilityMember