Employee Benefit Plans - Schedule of Changes Recognized in Other Comprehensive Income (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Defined Pension Benefits
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax [Abstract]
Net actuarial gain (loss)	$ (5)	$ (16)
Reclassification adjustments for amounts recognized in net periodic benefit cost	1	1
Total gain (loss) recognized in other comprehensive income	(4)	(15)
Other Postretirement Benefits
Defined Benefit Plan, Amounts Recognized in Other Comprehensive Income (Loss), Net Actuarial Gain (Loss), before Tax [Abstract]
Net actuarial gain (loss)	7	(3)
Reclassification adjustments for amounts recognized in net periodic benefit cost	(4)	(3)
Total gain (loss) recognized in other comprehensive income	$ 3	$ (6)