Acquisitions - Intangible assets (Details) - Rexam $ in Millions	6 Months Ended
	Jun. 30, 2016 USD ($)
Certain intangible assets
Fair Value	$ 1,888
Customer relationships
Certain intangible assets
Fair Value	$ 1,840
Weighted-Average Estimated Useful Life (in Years)	15 years
Trademarks
Certain intangible assets
Fair Value	$ 40
Weighted-Average Estimated Useful Life (in Years)	5 years
Technology
Certain intangible assets
Fair Value	$ 8
Weighted-Average Estimated Useful Life (in Years)	9 years