Operating Leases, Commitments and Contingencies, and Guarantees (Future Minimum Lease Payments) (Details) - Lease Agreements [Member] $ in Millions	Dec. 31, 2015 USD ($)
Operating Leased Assets [Line Items]
Operating Leases, Future Minimum Payments Due, Next Twelve Months	$ 35
Operating Leases, Future Minimum Payments, Due in Two Years	31
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	23
Operating Leases, Future Minimum Payments, Due Thereafter	117
Operating Leases, Future Minimum Payments Due	$ 261