Income Taxes Level 4 (Details) - Unrecognized Tax Benefits - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Balance at beginning of year	$ 62	$ 66
Additions based on tax positions related to the current year	4	4
Additions for tax positions of prior years	42	2
Reductions for tax positions of prior years	(35)	(3)
Settlements	0	0
Foreign currency translation	0	(7)
Balance at end of year	73	62	$ 66
Unrecognized Tax Benefits, Period Increase (Decrease)	17
Income Tax Examination, Penalties Expense	6	4	$ 3
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	43	$ 37
Unrecognized Tax Benefits that Would Impact Effective Tax Rate	73
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	$ 2