Investments (Details) (USD $) In Millions, unless otherwise specified	Jun. 30, 2013		Dec. 31, 2012		Jun. 30, 2012	Dec. 31, 2011
Interest-bearing Assets
Cash and cash equivalents	$ 266		$ 291		$ 286	$ 272
Short-term investments	307		346
Fiduciary assets	4,089	[1]	4,029	[1]
Investments	172		165
Total interest-bearing assets	4,834		4,831
Investments:
Equity method investments	94		102
Other investments	53		43
Fixed-maturity securities	25		20
Investments	$ 172		$ 165

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