Income Taxes Level 4 (Details) - Unrecognized Tax Benefits - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 80	$ 73
Additions based on tax positions related to the current year	4	2
Additions for tax positions of prior years	16	1
Reductions for tax positions of prior years	(2)	(1)
Settlements	0	0
Foreign currency translation	(4)	5
Balance at end of year	94	80	$ 73
Unrecognized Tax Benefits, Period Increase (Decrease)	16
Income Tax Examination, Penalties Expense	3	5	$ 6
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	51	$ 49
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	94
Maximum [Member]
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Amount of Unrecognized Tax Benefits Expected to Be Recognized within the Next 12 Months	$ 25