Employee Benefit Plans - Schedule of Amounts Recognized in Balance Sheet (Details) - USD ($) $ in Millions	Dec. 31, 2015	Dec. 31, 2014
Defined Pension Benefits
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Other assets	$ 48	$ 48
Other liabilities	(11)	(13)
Net amount recognized as of December 31,	37	35
Accumulated benefit obligation as of December 31,	185	204
Other Postretirement Benefits
Defined Benefit Plan, Amounts Recognized in Balance Sheet [Abstract]
Other assets	0	0
Other liabilities	(40)	(48)
Net amount recognized as of December 31,	$ (40)	$ (48)