Income Taxes - Reconciliation of the Provision (Benefit) for Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
A reconciliation of the provision (benefit) for income taxes
Statutory U.S. Federal tax rate (as a percent)	35.00%
Increase (decrease) in provision for income taxes due to:
Tax provision on pretax earnings (loss) from continuing operations at statutory U.S. Federal tax rate	$ 96	$ 124	$ 94
Non-U.S. tax rates	(29)	(22)	(12)
U.S. Tax Cut and Jobs Act: transition tax, net of foreign tax credits	2
Tax law changes	152	(3)	(3)
Change in valuation allowance: U.S. tax law change	(162)
Change in valuation allowance: other	(283)	3	1
Tax attribute expiration	330
Withholding tax, net	8	7	10
Non-deductible acquisition costs			6
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount	9	20	7
U.S. tax on intercompany dividends and interest	2	3	16
Tax exempt income	(3)	(2)	(3)
Intraperiod tax allocation		(8)
Tax credit	(37)	(19)	(14)
Change in tax reserves	(18)	8	5
Mexico inflationary adjustment	13	6	3
Equity earnings	(13)	(9)	(7)
Intercompany financing	(4)	(5)	1
Other taxes based on income	10	11	3
Other items	(3)	5	(1)
Total for continuing operations	$ 70	$ 119	$ 106