Operating Leases, Commitments and Contingencies, and Guarantees (Future Minimum Lease Payments and Sublease Receipts) (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014
Operating Leases, Commitments and Contingencies, and Guarantees [Abstract]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 36
Operating Leases, Future Minimum Payments, Due in Two Years	35
Operating Leases, Future Minimum Payments, Due in Three Years	30
Operating Leases, Future Minimum Payments, Due in Four Years	25
Operating Leases, Future Minimum Payments, Due in Five Years	21
Operating Leases, Future Minimum Payments, Due Thereafter	98
Operating Leases, Future Minimum Payments Due	245
Operating Leases, Future Minimum Payments Receivable, in Five Years	1
Operating Leases, Future Minimum Payments Receivable, Thereafter	1
Operating Leases, Future Minimum Payments Receivable	$ 2