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Fair Value Measurements (Schedule Of Debt Securities Measured At Fair Value On A Recurring Basis, Unobservable Input Reconciliation) (Details) - USD ($)
$ in Millions
3 Months Ended
Dec. 30, 2017
Dec. 31, 2016
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward]    
Balance at beginning of year $ 51 $ 57
Total realized gains (losses) included in earnings 0 0
Total unrealized gains (losses) included in other comprehensive income (loss) 0 (1)
Purchases 4 4
Issuances 0 0
Settlements (5) (5)
Balance at end of period 50 55
Total gains (losses) for the three-month period included in earnings attributable to the change in unrealized gains (losses) relating to assets and liabilities still held at end of period $ 0 $ 0