Investments (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014		Dec. 31, 2013		Dec. 31, 2012	Dec. 31, 2011
Interest-bearing Assets
Cash and cash equivalents	$ 374		$ 477		$ 291	$ 272
Short-term investments	394		523
Fiduciary assets	3,984	[1]	3,778	[1]
Investments	143		132
Total interest-bearing assets	4,895		4,910
Investments:
Equity method investments	124	[2]	113	[2]
Other investments, at cost	12		10
Fixed-maturity securities	7		9
Investments	$ 143		$ 132

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

[2] The increase in equity method investments is primarily due to contributions to limited partnerships.