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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
Sep. 30, 2017
Oct. 01, 2016
Level 3 [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Pension, Fair Value of Plan Assets $ 28 $ 28
Level 3 [Member] | Insurance Contract At Contract Value [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Pension, Fair Value of Plan Assets 28 28
Pension Plan [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Pension, Fair Value of Plan Assets 1,512 1,440
Pension Plan [Member] | Cash and Cash Equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Pension, Fair Value of Plan Assets 15 13
Pension Plan [Member] | Insurance Contract At Contract Value [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Pension, Fair Value of Plan Assets [1] 28 28
Pension Plan [Member] | Total Assets in Fair Value Hierarchy [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Pension, Fair Value of Plan Assets 43 41
Pension Plan [Member] | Common Collective Trusts [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Pension, Fair Value of Plan Assets [2] 1,469 1,399
Pension Plan [Member] | Level 1 [Member] | Cash and Cash Equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Pension, Fair Value of Plan Assets 15 13
Pension Plan [Member] | Level 1 [Member] | Insurance Contract At Contract Value [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Pension, Fair Value of Plan Assets [1] 0 0
Pension Plan [Member] | Level 1 [Member] | Total Assets in Fair Value Hierarchy [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Pension, Fair Value of Plan Assets 15 13
Pension Plan [Member] | Level 2 [Member] | Cash and Cash Equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Pension, Fair Value of Plan Assets 0 0
Pension Plan [Member] | Level 2 [Member] | Insurance Contract At Contract Value [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Pension, Fair Value of Plan Assets [1] 0 0
Pension Plan [Member] | Level 2 [Member] | Total Assets in Fair Value Hierarchy [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Pension, Fair Value of Plan Assets 0 0
Pension Plan [Member] | Level 3 [Member] | Cash and Cash Equivalents [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Pension, Fair Value of Plan Assets 0 0
Pension Plan [Member] | Level 3 [Member] | Insurance Contract At Contract Value [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Pension, Fair Value of Plan Assets [1] 28 28
Pension Plan [Member] | Level 3 [Member] | Total Assets in Fair Value Hierarchy [Member]    
Defined Benefit Plan Disclosure [Line Items]    
Defined Benefit Pension, Fair Value of Plan Assets $ 28 $ 28
[1] We classify 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.
[2] Funds that are measured at fair value using the net asset value (NAV) per share practical expedient have not been categorized in the fair value hierarchy. The amounts presented above are intended to permit reconciliation of the fair value hierarchy to the fair value of total plan assets in order to determine the amounts included in Other Assets and Other Liabilities in the Consolidated Balance Sheets.