Investments (Details) (USD $) In Millions, unless otherwise specified	Sep. 30, 2013		Dec. 31, 2012		Sep. 30, 2012	Dec. 31, 2011
Interest-bearing Assets
Cash and cash equivalents	$ 369		$ 291		$ 290	$ 272
Short-term investments	357		346
Fiduciary assets	4,335	[1]	4,029	[1]
Investments	139		165
Total interest-bearing assets	5,200		4,831
Investments:
Equity method investments	113		102
Other investments	17	[2]	43	[2]
Fixed-maturity securities	9	[3]	20	[3]
Investments	$ 139		$ 165

[1] Fiduciary assets include funds held on behalf of clients but does not include fiduciary receivables.

[2] The reduction in other investments is due to the sale of certain equity securities

[3] The reduction in fixed-maturity securities is due to the repayment in full of a security