Equity (Impact of Reclassifications from Accumulated Other Comprehensive Income on Earnings (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Sep. 30, 2018	Jul. 01, 2018	Apr. 01, 2018	Dec. 31, 2017	Oct. 01, 2017	Jul. 02, 2017	Apr. 02, 2017	Jan. 01, 2017	Sep. 30, 2018	Oct. 01, 2017	Oct. 02, 2016	Sep. 27, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ 1,175.8				$ 5,457.0				$ 1,175.8	$ 5,457.0	$ 5,890.7	$ 5,819.8
Amounts Reclassified from AOCI, Interest income and other, net									191.4	181.8	102.6
Amounts Reclassified from AOCI, Interest expense									(170.3)	(92.5)	(81.3)
Amounts Reclassified from AOCI, Revenue	6,303.6	$ 6,310.3	$ 6,031.8	$ 6,073.7	5,698.3	$ 5,661.5	$ 5,294.0	$ 5,732.9	24,719.5	22,386.8	21,315.9
Amounts Reclassified from AOCI, Cost of sales including occupancy costs									(10,174.5)	(9,034.3)	(8,509.0)
Gain resulting from acquisition of joint venture									1,376.4	0.0	0.0
Gain (Loss) on Disposition of Business									499.2	93.5	5.4
Amounts Reclassified from AOCI, Tax (expense)/benefit									(1,262.0)	(1,432.6)	(1,379.7)
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									(24.7)	67.2	(78.2)
Amounts Reclassified from AOCI, Tax (expense)/benefit									1.2	(14.0)	11.8
Amounts Reclassified from AOCI, Net of tax									(23.5)	53.2	(66.4)
Accumulated Net Investment Gain (Loss) Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	(4.9)				(2.5)				(4.9)	(2.5)	1.1	(0.1)
Amounts Reclassified from AOCI, Net of tax									2.7	3.0	(1.0)
Accumulated Net Investment 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 income and other, net									(3.6)	(4.1)	1.6
Cash Flow Hedges [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	17.7				(4.1)				17.7	(4.1)	10.9	25.6
Amounts Reclassified from AOCI, Net of tax									3.9	(55.6)	67.4
Accumulated Net Investment Hedge Gain (Loss) Attributable to Parent [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	19.6				14.0				19.6	14.0	1.3	1.3
Amounts Reclassified from AOCI, Net of tax									0.0	0.0	0.0
Translation Adjustment [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	$ (362.7)				$ (163.0)				(362.7)	(163.0)	(121.7)	$ (226.2)
Amounts Reclassified from AOCI, Net of tax									16.9	(0.6)	0.0
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									(1.7)	0.6	0.0
Interest Rate Contract [Member] | 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, Interest expense									4.9	4.8	5.0
Cross-Currency Swap [Member] | 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, Interest income and other, net									2.2	57.2	(101.1)
Foreign Currency Contract - Other [Member] | 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, Revenue									(0.4)	3.0	4.9
Foreign Currency and Coffee Contracts [Member] | 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, Cost of sales including occupancy costs									(10.6)	5.7	11.4
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]
Gain (Loss) on Disposition of Business									(24.1)	0.0	0.0
East China JV [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Gain resulting from acquisition of joint venture									1,400.0	1,376.4
Preexisting ownership percentage			50.00%
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									7.2	0.0	0.0
Taiwan JV [Member]
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]
Preexisting ownership percentage			50.00%
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									$ 1.4	$ 0.0	$ 0.0