Securities Available for Sale Textuals (Details) (USD $)	3 Months Ended	9 Months Ended
Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Dec. 31, 2012
Securities Available For Sale (Textual) [Abstract]
Cost	$ 253,606,000,000		$ 253,606,000,000		$ 223,283,000,000
Fair value	259,399,000,000		259,399,000,000		235,199,000,000
Gross unrealized losses	3,946,000,000		3,946,000,000		1,054,000,000
OTTI	39,000,000	39,000,000	153,000,000	172,000,000
Expected remaining life of loan losses From	1.00%	3.00%	1.00%	1.00%
Expected remaining life of loan losses To	14.00%	36.00%	20.00%	44.00%
Current subordination levels From	0.00%	0.00%	0.00%	0.00%
Current subordination levels To	3.00%	9.00%	41.00%	57.00%
Held-to-maturity Securities	0		0		0
Collateralized debt obligations [Member]
Securities Available For Sale (Textual) [Abstract]
Cost	533,000,000		533,000,000		556,000,000
Fair value	700,000,000		700,000,000		644,000,000
Asset-backed Securities Collateralized by Auto Leases or Loans and Cash Reserves [Member]
Securities Available For Sale (Textual) [Abstract]
Cost	5,100,000,000		5,100,000,000		5,900,000,000
Fair value	5,200,000,000		5,200,000,000		5,900,000,000
Asset-backed Securities Collateralized by Home Equity Loans [Member]
Securities Available For Sale (Textual) [Abstract]
Cost	594,000,000		594,000,000		695,000,000
Fair value	831,000,000		831,000,000		918,000,000
Mortgage Backed Securities [Member]
Securities Available For Sale (Textual) [Abstract]
Cost	148,613,000,000		148,613,000,000		125,471,000,000
Fair value	151,292,000,000		151,292,000,000		133,184,000,000
Gross unrealized losses	2,445,000,000		2,445,000,000		321,000,000
Federal agencies [Member]
Securities Available For Sale (Textual) [Abstract]
Cost	118,793,000,000		118,793,000,000		92,855,000,000
Fair value	118,963,000,000		118,963,000,000		97,285,000,000
Gross unrealized losses	2,251,000,000		2,251,000,000		4,000,000
OTTI	0	0	1,000,000	0
Commercial [Member]
Securities Available For Sale (Textual) [Abstract]
Cost	17,704,000,000		17,704,000,000		18,438,000,000
Fair value	18,805,000,000		18,805,000,000		19,968,000,000
Gross unrealized losses	152,000,000		152,000,000		268,000,000
OTTI	6,000,000	8,000,000	47,000,000	41,000,000
Expected remaining life of loan losses From	4.00%	3.00%	4.00%	3.00%
Expected remaining life of loan losses To	14.00%	14.00%	14.00%	17.00%
Current subordination levels From	4.00%	0.00%	0.00%	0.00%
Current subordination levels To	12.00%	12.00%	21.00%	12.00%
Securities we Intend to Sell [Member]
Securities Available For Sale (Textual) [Abstract]
Fair value	0		0		0
Securities we do not Intend to Sell [Member] \| Commercial [Member]
Securities Available For Sale (Textual) [Abstract]
OTTI	6,000,000	7,000,000	21,000,000	41,000,000
Investment Grade [Member]
Securities Available For Sale (Textual) [Abstract]
Fair value	88,597,000,000		88,597,000,000		18,139,000,000
Gross unrealized losses	3,657,000,000		3,657,000,000		573,000,000
Investment Grade [Member] \| Mortgage Backed Securities [Member]
Securities Available For Sale (Textual) [Abstract]
Fair value	56,667,000,000		56,667,000,000		4,435,000,000
Gross unrealized losses	2,311,000,000		2,311,000,000		38,000,000
Investment Grade [Member] \| Federal agencies [Member]
Securities Available For Sale (Textual) [Abstract]
Fair value	52,557,000,000		52,557,000,000		2,247,000,000
Gross unrealized losses	2,251,000,000		2,251,000,000		4,000,000
Investment Grade [Member] \| Commercial [Member]
Securities Available For Sale (Textual) [Abstract]
Fair value	3,909,000,000		3,909,000,000		2,110,000,000
Gross unrealized losses	58,000,000		58,000,000		31,000,000
Unrated Investment Grade Securities [Member]
Securities Available For Sale (Textual) [Abstract]
Fair value	2,000,000,000		2,000,000,000		2,000,000,000
Gross unrealized losses	$ 23,000,000		$ 23,000,000		$ 19,000,000

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

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For an unclassified balance sheet, this item represents investments in debt securities which are categorized as held-to-maturity. The held-to-maturity category is for those securities that the entity has the positive intent and ability to hold until maturity.

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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.

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