Commitments and Contingent Liabilities Commitments and Contingent Liabilities (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Commitments and Contingencies Disclosure [Abstract]
Operating Leases, Rent Expense, Net	$ 11	$ 13	$ 17
Operating Leases, Future Minimum Payments Due, Next Twelve Months	19
Operating Leases, Future Minimum Payments, Due in Two Years	17
Operating Leases, Future Minimum Payments, Due in Three Years	15
Operating Leases, Future Minimum Payments, Due in Four Years	13
Operating Leases, Future Minimum Payments, Due in Five Years	10
Operating Leases, Future Minimum Payments, Due Thereafter	18
Operating Leases, Future Minimum Payments Due	$ 92