Employee Benefit Plan - Status of Underfunded Benefit Plans (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Pension Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Noncurrent assets	$ 20	$ 0
Current liabilities	(1)	(1)
Non-current liabilities	(71)	(53)
Underfunded status at end of year	(52)	(54)
U. S. Postretirement Benefits
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items]
Noncurrent assets	0	0
Current liabilities	(2)	(1)
Non-current liabilities	(7)	(8)
Underfunded status at end of year	$ (9)	$ (9)