Acquisitions and Divestitures (Narrative) (Details) - USD ($)		3 Months Ended		6 Months Ended		12 Months Ended
	Dec. 31, 2017	Mar. 31, 2019	Apr. 01, 2018	Mar. 31, 2019	Apr. 01, 2018	Sep. 30, 2018	Aug. 26, 2018
Business Acquisition [Line Items]
Gain resulting from acquisition of joint venture		$ 0	$ 47,600,000	$ 0	$ 1,373,900,000
Goodwill		3,603,500,000		3,603,500,000		$ 3,541,600,000
Finite-Lived Intangible Assets, Accumulated Amortization		502,500,000		502,500,000		371,000,000.0
Deconsolidation, Gain (Loss), Amount				21,000,000.0	$ 496,300,000
Taiwan JV [Member]
Business Acquisition [Line Items]
Sale of Ownership Interest in Retail Business			181,200,000
Deconsolidation, Gain (Loss), Amount			$ 156,600,000
East China JV [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Dec. 31, 2017
Preexisting ownership percentage in equity method investment			50.00%		50.00%
Amount paid for interest acquired			$ 1,400,000,000
Gain resulting from acquisition of joint venture						1,400,000,000
Taiwan JV [Member]
Business Acquisition [Line Items]
Preexisting ownership percentage in equity method investment			50.00%		50.00%
Acquired and reacquired rights
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization		$ 444,700,000		$ 444,700,000		$ 320,100,000
Nestle Global Coffee Alliance [Member]
Business Acquisition [Line Items]
Deferred Revenue							$ 7,000,000,000