PAC Disposition (Details) - USD ($) $ in Millions	3 Months Ended	9 Months Ended	12 Months Ended
	Sep. 30, 2016	Sep. 30, 2016	Dec. 31, 2015
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
gross cash consideration	$ 226	$ 226
Liabilities transferred, net of cash	6	6
PAC post closing adjustment to purchase price	1
Gain (Loss) on Disposition of Business	$ 120	120
PAC Business Annual Sales			$ 370
Pre-tax Income of Affiliate		$ 14