Customer Deposits (Details 1) (USD $) In Millions, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Deposits By Type
Savings accounts - Direct	$ 15,611	$ 14,649
Certificates of deposit - Direct	817	893
Other deposits	156	627
Total customer deposits	35,961	37,898
United States [Member]
Deposits By Type
Certificates of deposit - Third party	9,127	10,781
Sweep accounts - Third party	$ 10,250	$ 10,948