Restructuring and Other (Components of Outstanding Restructuring Reserve and Movements) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring Reserve [Roll Forward]
Provisions	$ 23	$ 21	$ 46
Termination Benefits [Member]
Restructuring Reserve [Roll Forward]
Provisions	20	8	35
Other Exit Costs [Member]
Restructuring Reserve [Roll Forward]
Provisions	3	13	$ 11
2015 European Division Actions [Member]
Restructuring Reserve [Roll Forward]
Balance at beginning of period	0
Provisions	17
Balance at end of period	17	0
2015 European Division Actions [Member] | Termination Benefits [Member]
Restructuring Reserve [Roll Forward]
Balance at beginning of period	0
Provisions	17
Balance at end of period	17	0
2015 European Division Actions [Member] | Other Exit Costs [Member]
Restructuring Reserve [Roll Forward]
Balance at beginning of period	0
Provisions	0
Balance at end of period	$ 0	$ 0