Schedule II - Valuation and Qualifying Accounts (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Allowance for doubtful accounts and notes receivable [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		$ 71	$ 47	$ 50
Charged to Expense		3	29	10
Deductions	[1]	(19)	(5)	(13)
Balance at end of period		55	71	47
Deferred tax asset valuation allowance [Member]
Movement in Valuation Allowances and Reserves [Roll Forward]
Balance at beginning of period		107	127	329
Charged to Expense		(17)	(13)	20
Other	[2]	70	(7)	(222)
Deductions				0
Balance at end of period		$ 160	$ 107	$ 127

[1] Amounts charged off less recoveries of amounts previously charged off.

[2] Represents acquisitions/dispositions/revisions; net transfers associated with the Separation; deferred tax asset reinstatement in conjunction with German tax legislation, the realization of which is not more likely than not; and the effect of translating foreign financial statements.