Other Income, Net Table (Details) - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Sep. 30, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Interest income		$ 7	$ 1	$ 5
Loss on extinguishment of debt	$ (73)	0	(73)	(58)
Components of net periodic benefit cost other than service cost		32	18	26
Reserve for Unsecured Creditors litigation		(10)	(300)	0
Costs associated with acquisitions		(8)	0	(40)
Contingent consideration liability fair value adjustment		14	(3)	7
Other, net		8	9	(2)
Other expense, net		(21)	(384)	$ (114)
Unsecured Creditors Litigation
Reserve for Unsecured Creditors litigation		$ (10)
Unsecured Creditors Litigation | Judicial Ruling | Other income (expense), net
Reserve for Unsecured Creditors litigation			$ (300)