Investments (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2013		Dec. 31, 2012		Mar. 31, 2012	Dec. 31, 2011
Interest-bearing Assets
Cash and cash equivalents	$ 408		$ 291		$ 323	$ 272
Short-term investments	352		346
Fiduciary assets	4,253	[1]	4,029	[1]
Investments	152		165
Total interest-bearing assets	5,165		4,831
Investments:
Equity method investments	93	[2]	102	[2]
Other investments, at cost	40		43
Fixed-maturity securities	19		20
Investments	$ 152		$ 165

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

[2] The reduction in equity method investments is primarily due to redemptions.