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Acquisitions and Dispositions - Others (Details) $ in Millions, £ in Billions			1 Months Ended			9 Months Ended
	Jun. 30, 2016 GBP (£)	Jun. 30, 2016 USD ($)	Mar. 31, 2017 USD ($)	Oct. 31, 2016 USD ($)	Jan. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Sep. 30, 2017
Acquisitions
Purchase price, net of cash acquired						$ 3,379
Wavefront
Acquisitions
Purchase price, net of cash acquired					$ 36
Rexam
Acquisitions
Purchase price, net of cash acquired	£ 2.9	$ 3,800
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Food And Aerosol Paint And General Line Plant \| Hubbard, Ohio
Disposal of business facility
Price agreed upon for sale of plant			$ 32
Gain (loss) on dispositions			$ 15
Disposal Group, Disposed of by Sale, Not Discontinued Operations \| Food And Aerosol Specialty Tin Business \| Baltimore, Maryland
Disposal of business facility
Price agreed upon for sale of plant				$ 24
Gain (loss) on dispositions				$ 9
Senior Notes 4.375 Percent, due December 2020
Acquisitions
Interest rate (as a percent)							4.375%
Senior Notes 3.50 Percent, euro denominated, due December 2020
Acquisitions
Interest rate (as a percent)							3.50%
Senior Notes 4.375 Percent, euro denominated, due December 2023
Acquisitions
Interest rate (as a percent)							4.375%