Contingencies, Commitments and Guarantees (details) - Guarantees (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013
Guarantees of certain investments and third-party loans [Member]
Guarantor obligations
Maximum amount of contingent obligation	$ 129
Amount indemnified by a third party	63
Guarantees of certain insurance policy obligations [Member]
Guarantor obligations
Maximum amount of contingent obligation	480
Amount indemnified by a third party	480
Indemnifications related to the sale of businesses [Member]
Guarantor obligations
Period range for term of indemnification provisions arising from sales of business entities, minimum (in months)	18 months
Maximum amount of contingent obligation	474
Amount recognized on balance sheet for contingent obligation	$ 9