Equity (Impact of Reclassifications from Accumulated Other Comprehensive Income on Earnings (Details) - USD ($) $ in Millions	12 Months Ended
	Sep. 27, 2020	Sep. 29, 2019	Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Interest income and other, net	$ 39.7	$ 96.5	$ 191.4
Amounts Reclassified from AOCI, Interest expense	(437.0)	(331.0)	(170.3)
Gain resulting from acquisition of joint venture	0.0	0.0	1,376.4
Amounts Reclassified from AOCI, Tax (expense)/benefit	(239.7)	(871.6)	(1,262.0)
Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified, from AOCI, Total before tax	20.1	(1.3)	(24.7)
Amounts Reclassified from AOCI, Tax (expense)/benefit	(5.2)	(1.6)	1.2
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	(14.9)	2.9	23.5
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	4.0	(0.6)	(2.7)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Interest income and other, net	4.9	0.9	(3.6)
Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	1.1	(4.0)	(3.9)
Cash Flow Hedges [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified, from AOCI, Total before tax	(1.9)	3.9	3.9
Accumulated Net Investment Hedge Gain (Loss) Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	9.8	0.0	0.0
Accumulated Net Investment Hedge Gain (Loss) Attributable to Parent [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Interest expense	(13.3)	0.0	0.0
Translation Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Reclassification from Accumulated Other Comprehensive Income, Current Period, Net of Tax	0.0	1.7	(16.9)
Translation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Interest income and other, net	0.0	0.0	(1.7)
Brazil Retail Operations [Member] | Translation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Deconsolidation, Gain (Loss), Amount	0.0	0.0	(24.1)
East China JV [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain resulting from acquisition of joint venture			1,400.0
East China JV [Member] | Translation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain resulting from acquisition of joint venture	0.0	0.0	7.2
Taiwan JV [Member] | Translation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain resulting from acquisition of joint venture	0.0	0.0	1.4
Thailand Retail Operations [Member] | Translation Adjustment [Member] | Reclassification out of Accumulated Other Comprehensive Income [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Deconsolidation, Gain (Loss), Amount	$ 0.0	$ 1.7	$ 0.0