Restructuring and Other Costs Level 4 (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Restructuring and Other Costs [Abstract]
Severance benefits and related costs	$ 1	$ 8	$ 7
Professional fees	0	0	15
Asset impairment charges	0	9	5
Restructuring Costs	1	17	27
Movement in Restructuring Reserve by type of cost [Roll Forward]
Balance, beginning of period	4	1
Accruals/provisions	1	17
Payments/write-offs	(5)	(14)
Balance, End of Period	0	4	1
Employee Severance [Member]
Movement in Restructuring Reserve by type of cost [Roll Forward]
Balance, beginning of period	4	1
Accruals/provisions	1	8
Payments/write-offs	(5)	(5)
Balance, End of Period	0	4	1
Professional Fees [Member] (Deprecated 2013-01-31)
Movement in Restructuring Reserve by type of cost [Roll Forward]
Balance, beginning of period	0	0
Accruals/provisions	0	0
Payments/write-offs	0	0
Balance, End of Period	0	0	$ 0
Asset Impairment Charges [Member]
Movement in Restructuring Reserve by type of cost [Roll Forward]
Balance, beginning of period	0
Accruals/provisions	0	9
Payments/write-offs	0	(9)
Balance, End of Period	$ 0	$ 0