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Pensions And Other Postretirement Benefits (Categories Of Pension Plan Assets And Level Under Which Fair Values Were Determined In Fair Value Hierarchy) (Details) - USD ($)
$ in Millions
Oct. 03, 2015
Sep. 27, 2014
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets $ 1,576 $ 1,650
Cash and Cash Equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 5 79
Total Fixed Income Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 1,334 1,317
Bond and Fixed Income Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 1,334 377
Corporate Bonds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets   680
Government and Municipal Bonds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets   253
Mortgage Backed Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets   7
Total Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 223 232
US Securities Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 61 84
Non-US Securities Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 106 101
Commodity Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets   14
Global Real Estate Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 56 33
Other [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets   7
Insurance Contract At Contract Value [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 14 15
Level 1 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 5 79
Level 1 [Member] | Cash and Cash Equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 5 79
Level 1 [Member] | Total Fixed Income Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 0 0
Level 1 [Member] | Bond and Fixed Income Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 0 0
Level 1 [Member] | Corporate Bonds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets   0
Level 1 [Member] | Government and Municipal Bonds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets   0
Level 1 [Member] | Mortgage Backed Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets   0
Level 1 [Member] | Total Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 0 0
Level 1 [Member] | US Securities Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 0 0
Level 1 [Member] | Non-US Securities Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 0 0
Level 1 [Member] | Commodity Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets   0
Level 1 [Member] | Global Real Estate Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 0 0
Level 1 [Member] | Other [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets   0
Level 1 [Member] | Insurance Contract At Contract Value [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 0 0
Level 2 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [1] 1,557 1,549
Level 2 [Member] | Cash and Cash Equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [1] 0 0
Level 2 [Member] | Total Fixed Income Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [1] 1,334 1,310
Level 2 [Member] | Bond and Fixed Income Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [1] 1,334 377
Level 2 [Member] | Corporate Bonds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [1]   680
Level 2 [Member] | Government and Municipal Bonds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [1]   253
Level 2 [Member] | Mortgage Backed Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [1]   0
Level 2 [Member] | Total Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [1] 223 232
Level 2 [Member] | US Securities Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [1] 61 84
Level 2 [Member] | Non-US Securities Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [1] 106 101
Level 2 [Member] | Commodity Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [1]   14
Level 2 [Member] | Global Real Estate Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [1] 56 33
Level 2 [Member] | Other [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [1]   7
Level 2 [Member] | Insurance Contract At Contract Value [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [1] 0 0
Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [2] 14 22
Level 3 [Member] | Cash and Cash Equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [2] 0 0
Level 3 [Member] | Total Fixed Income Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [2] 0 7
Level 3 [Member] | Bond and Fixed Income Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [2] 0 0
Level 3 [Member] | Corporate Bonds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [2]   0
Level 3 [Member] | Government and Municipal Bonds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [2]   0
Level 3 [Member] | Mortgage Backed Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets 0 7 [2]
Level 3 [Member] | Total Equity Securities [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [2] 0 0
Level 3 [Member] | US Securities Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [2] 0 0
Level 3 [Member] | Non-US Securities Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [2] 0 0
Level 3 [Member] | Commodity Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [2]   0
Level 3 [Member] | Global Real Estate Funds [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [2] 0 0
Level 3 [Member] | Other [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [2]   0
Level 3 [Member] | Insurance Contract At Contract Value [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined benefit pension plan assets [2] $ 14 $ 15
[1] We classify our investments in United States government, United States agency, fixed income funds, bond funds, corporate bonds, and other debt securities as Level 2 as fair value is generally estimated using discounted cash flow models that are primarily industry-standard models that consider various assumptions, including time value and yield curve as well as other readily available relevant economic measures. Funds are valued using the net asset value (NAV) provided by the trustee, which is a practical expedient to estimating fair value. The NAV is based on the fair value of the underlying investments within the funds and is determined daily.
[2] We classify certain mortgage-backed, asset-backed and insurance contracts as Level 3 as there is limited activity or less observable inputs into valuation models, including current interest rates and estimated prepayment, default and recovery rates on the underlying portfolio or structured investment vehicle. The insurance contracts are valued using the plan’s own assumptions about the assumptions market participants would use in pricing the assets based on the best information available, such as investment manager pricing. Significant changes to assumptions or unobservable inputs in the valuation of our Level 3 instruments would not have a significant impact to our consolidated financial statements.