Equity (Impact of Reclassifications from Accumulated Other Comprehensive Income on Earnings) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended		12 Months Ended
	Jun. 30, 2019	Jul. 01, 2018	Jun. 30, 2019	Jul. 01, 2018	Sep. 30, 2018
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Total cost of common stock repurchased			$ 8,000.0	$ 4,100.0
Amounts Reclassified from AOCI, Interest income and other, net	$ 40.2	$ 31.5	80.2	155.2
Revenues	6,823.0	6,310.3	19,761.6	18,415.9
Amounts Reclassified from AOCI, Interest expense	(86.4)	(45.4)	(235.3)	(106.4)
Amounts Reclassified from AOCI, Cost of sales including occupancy costs	(2,808.6)	(2,553.4)	(8,171.1)	(7,569.8)
Gain resulting from acquisition of joint venture	0.0	2.5	0.0	1,376.4
Deconsolidation, Gain (Loss), Amount			622.8	496.3
Gain (Loss) on Disposition of Business	601.8	0.0	622.8	496.3
Amounts Reclassified from AOCI, Tax (expense)/benefit	(303.7)	(174.8)	(670.1)	(1,086.5)
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	(3.2)	17.5	(5.5)	(38.0)
Amounts Reclassified from AOCI, Tax (expense)/benefit	0.3	(3.2)	(0.6)	4.0
Amounts Reclassified from AOCI, Net of tax	(2.9)	14.3	(6.1)	(34.0)
AOCI, Accumulated Gain (Loss), Debt Securities, Available-for-sale, Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Net of tax	0.2	0.6	0.6	2.4
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	0.2	(0.9)	0.9	(3.3)
Accumulated Net Gain (Loss) from Designated or Qualifying Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Net of tax	4.4	(14.9)	7.2	14.7
Accumulated Net Gain (Loss) from Designated or Qualifying 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	5.1	(18.4)	8.1	17.5
Accumulated Net Investment Hedge Gain (Loss) Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Net of tax	0.0	0.0	0.0	0.0
Translation Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Amounts Reclassified from AOCI, Net of tax	(1.7)	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	(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	(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	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	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	$ 1.7	$ 0.0	$ 1.7	$ 0.0