Investments (Details) (USD $) In Millions, unless otherwise specified	Mar. 31, 2014		Dec. 31, 2013		Mar. 31, 2013	Dec. 31, 2012
Interest-bearing Assets
Cash and cash equivalents	$ 338		$ 477		$ 408	$ 291
Short-term investments	340		523
Fiduciary assets	4,088	[1]	3,778	[1]
Investments	143		132
Total interest-bearing assets	4,909		4,910
Investments:
Equity method investments	127		113
Other investments	8		10
Fixed-maturity securities	8		9
Investments	$ 143		$ 132

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