Pension and Other Post Employment Benefits (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Defined Contribution Savings Plans
Cost for contributions to defined contribution savings plans	$ 8	$ 8	$ 9
Pension Benefits
Defined Benefit Pension Plan and Other Employee Benefit Plan
Benefit obligation	47	50
Fair value of plan assets	37	40
Unfunded status recognized in Other liabilities	(10)	(10)
Amounts recognized in Accumulated other comprehensive income	16	17
Change in benefit obligation	(3)
Future expected benefit payments
Future expected benefit payments in the year ending December 31, 2016	2
Future expected benefit payments in the year ending December 31, 2017	2
Future expected benefit payments in the year ending December 31, 2018	2
Future expected benefit payments in the year ending December 31, 2019	2
Future expected benefit payments in the year ending December 31, 2020	2
Future expected benefit payments for five years ending December 31, 2025	14
Contributions made to the plan		1
Other Post Employment Benefits
Defined Benefit Pension Plan and Other Employee Benefit Plan
Benefit obligation	1	1
Fair value of plan assets	0	0
Unfunded status recognized in Other liabilities	(1)	(1)
Amounts recognized in Accumulated other comprehensive income	$ 0	$ 0