Consolidated Balance Sheets (Parentheticals) (USD $) In Millions, except Per Share data, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
Available-for-sale Securities Pledged as Collateral	$ 79,966	$ 50,667
Assets Pledged included in Receivable for Securities Sold	0	319
Preferred Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Preferred Stock, Shares Authorized	10
Preferred Stock, Shares Issued	6.9	0
Preferred Stock, Shares Outstanding	6.9	0
Pref'd Stock Liquidation Preference	$ 173	$ 0
Common Stock, Par or Stated Value Per Share	$ 0.01	$ 0.01
Common Stock, Shares Authorized	600	300
Common Stock, Shares, Issued	338.9	224.2
Common Stock, Shares, Outstanding	338.9	224.2