Commitments and Guarantees (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Unrecorded Unconditional Purchase Obligation [Line Items]
Operating Leases, Future Minimum Payments Receivable, in Two Years	$ 3
Operating Leases, Future Minimum Payments, Due in Three Years	2
percentage of output	25.00%
Operating Leases, Rent Expense	9	10	9
Operating Leases, Future Minimum Payments Receivable, Current	3
Long-term Contract for Purchase of Electric Power, Estimated Annual Cost	1
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Five Years	1
Operating Leases, Rent Expense, Sublease Rentals	3	3	3
Future Minimum Sublease Rentals, Sale Leaseback Transactions, within Three Years	$ 1