Discontinued Operations - Summary of Assets and Liabilities of Disposal Group Held for Sale (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011	Dec. 31, 2010
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash	$ 23		$ 200		$ 103	$ 11
Assets of discontinued operations	165		2,032
Liabilities of discontinued operations	103		1,501
Insurance business [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash	0		2
Interest bearing deposits with banks	0		29
Available-for-sale securities	0		1,411
Other assets	0		226
Assets of discontinued operations	0		1,668
Insurance policy and claim reserves	0		988
Other liabilities	0		224
Liabilities of discontinued operations	0		1,212
Card and Retail Services [Member]
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash	23		197
Other assets	79	[1]	84	[1]
Assets of discontinued operations	102		281
Other liabilities	102	[2]	283	[2]
Liabilities of discontinued operations	$ 102		$ 283

[1] At December 31, 2013 and December 31, 2012, other assets primarily consists of current and deferred taxes.

[2] At December 31, 2013 and December 31, 2012, other liabilities primarily consists of certain legal accruals as discussed above.