Intangibles Assets, Net (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Total annual intangible asset amortization expense
Acquired intangible assets, net of accumulated amortization	$ 37		$ 37		$ 75
Accumulated amortization	135		135		163
Capitalized software (net of accumulated amortization)	81		81		84
Accumulated amortization - capitalized software	142		142		129
Total intangible assets, net	2,247		2,247		2,462
Amortization of Intangible Assets	50	$ 49	154	$ 166
Rexam
Total annual intangible asset amortization expense
Acquired intangible assets, net of accumulated amortization	2,129		2,129		2,303
Accumulated amortization	362		362		$ 246
Amortization of Intangible Assets	$ 40	$ 37	$ 124	120
Amortization recorded as a result of changes to the initial accounting of intangible assets in business combination				$ 15