Goodwill (Details) - USD ($)	9 Months Ended
	Sep. 30, 2016	Jun. 30, 2016	Dec. 31, 2015
Goodwill
Balance at the beginning of the period	$ 2,177,000,000
Business acquisition	3,804,000,000
Business disposition	(814,000,000)
Reclassification	(8,000,000)
Effects of currency exchange rates	52,000,000
Balance at the end of the period	5,211,000,000
Goodwill	2,177,000,000		$ 2,177,000,000
Rexam
Goodwill
Impairment of goodwill	0
Goodwill		$ 3,773,000,000
Beverage packaging, North And Central America
Goodwill
Balance at the beginning of the period	561,000,000
Business acquisition	1,039,000,000
Balance at the end of the period	1,600,000,000
Goodwill	561,000,000		561,000,000
Beverage packaging, South America
Goodwill
Balance at the beginning of the period	100,000,000
Business acquisition	904,000,000
Business disposition	(31,000,000)
Balance at the end of the period	973,000,000
Goodwill	100,000,000		100,000,000
Beverage packaging, Europe
Goodwill
Balance at the beginning of the period	817,000,000
Business acquisition	1,656,000,000
Business disposition	(783,000,000)
Effects of currency exchange rates	48,000,000
Balance at the end of the period	1,738,000,000
Goodwill	817,000,000		817,000,000
Food and aerosol packaging
Goodwill
Balance at the beginning of the period	612,000,000
Reclassification	(8,000,000)
Effects of currency exchange rates	4,000,000
Balance at the end of the period	608,000,000
Goodwill	612,000,000		612,000,000
Aerospace
Goodwill
Balance at the beginning of the period	9,000,000
Business acquisition	31,000,000
Balance at the end of the period	40,000,000
Goodwill	9,000,000		9,000,000
Other
Goodwill
Balance at the beginning of the period	78,000,000
Business acquisition	174,000,000
Balance at the end of the period	252,000,000
Goodwill	78,000,000		$ 78,000,000
Metal beverage packaging, Asia Pacific
Goodwill
Balance at the end of the period	78,000,000
Percentage of fair value exceeding carrying value			25.00%
Goodwill	$ 78,000,000