The amount of other than temporary impairment losses on investments in debt and equity securities categorized as Available-for-sale which have been recognized in earnings during the period. Such impairment losses consist of other than temporary impairments (OTTI) on equity securities, credit losses on investments in debt securities, and when the entity intends to sell an impaired debt security or it is more likely than not that the entity will be required to sell the impaired debt security before recovery of its amortized cost basis.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

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-Footnote 2

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name FASB Staff Position (FSP)

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-Paragraph 15D

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 3: http://www.xbrl.org/2003/role/presentationRef

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-Paragraph 15C

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

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Securities Available for Sale, Residential Mortgage-Backed Securities, Credit Loss Component (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 Residential [Member]	Jun. 30, 2012 Residential [Member]	Jun. 30, 2013 Residential [Member]	Jun. 30, 2012 Residential [Member]	Jun. 30, 2013 Non-investment Grade [Member] Residential [Member]	Mar. 31, 2012 Non-investment Grade [Member] Residential [Member]	Jun. 30, 2013 Non-investment Grade [Member] Residential [Member]	Jun. 30, 2012 Non-investment Grade [Member] Residential [Member]
Credit Impairment Losses On Residential Mortgage Backed Securities [Abstract]
Securities available for sale	$ 76	$ 82	$ 114	$ 133	$ 22	$ 34	$ 37	$ 48	$ 22	$ 34	$ 37	$ 48
Significant inputs (non-agency - non-investment grade MBS) [Abstract]
Expected remaining life of loan losses From	1.00%	1.00%	1.00%	1.00%
Expected remaining life of loan losses To	20.00%	37.00%	20.00%	44.00%
Credit impairment distribution [Abstract]
0 - 10% range	98.00%	68.00%	96.00%	62.00%
10 - 20% range	1.00%	18.00%	3.00%	16.00%
20 - 30% range	1.00%	11.00%	1.00%	8.00%
Greater than 30%	0.00%	3.00%	0.00%	14.00%
Weighted average	6.00%	9.00%	6.00%	9.00%
Current subordination levels [Abstract]
Current subordination levels From	0.00%	0.00%	0.00%	0.00%
Current subordination levels To	5.00%	22.00%	41.00%	57.00%
Current subordination levels Weighted average	1.00%	3.00%	0.00%	2.00%
Prepayment speed (annual CPR)
Prepayment speed From	6.00%	5.00%	4.00%	5.00%
Prepayment speed To	20.00%	24.00%	20.00%	29.00%
Prepayment speed Weighted average	16.00%	14.00%	15.00%	14.00%