Securities (Tables)

12 Months Ended

Dec. 31, 2013

Securities

Amortized Cost, Gross Unrealized Gains and Losses and Approximate Fair Values of Securities Available for Sale

			Amortized		Gross Unrealized				Fair
December 31, 2013			Cost		Gains		Losses		Value
			(Dollars in millions)
AFS securities:
	U.S. Treasury		$	595	$	—	$	—	$	595
	MBS issued by GSE			18,397		78		546		17,929
	States and political subdivisions			1,877		65		91		1,851
	Non-agency MBS			264		27		—		291
	Other			46		—		1		45
	Covered			989		404		—		1,393
		Total AFS securities	$	22,168	$	574	$	638	$	22,104

			Amortized		Gross Unrealized				Fair
December 31, 2012			Cost		Gains		Losses		Value
			(Dollars in millions)
AFS securities:
	U.S. Treasury		$	281	$	—	$	—	$	281
	GSE			9		—		—		9
	MBS issued by GSE			20,482		466		18		20,930
	States and political subdivisions			1,948		153		90		2,011
	Non-agency MBS			307		16		11		312
	Other			3		—		—		3
	Covered securities			1,147		444		—		1,591
		Total AFS securities	$	24,177	$	1,079	$	119	$	25,137

Amortized Cost, Gross Unrealized Gains and Losses and Approximate Fair Values of Securities Held to Maturity

			Amortized		Gross Unrealized				Fair
December 31, 2013			Cost		Gains		Losses		Value
			(Dollars in millions)
HTM securities:
	U.S. Treasury securities		$	392	$	0	$	8	$	384
	GSE securities			5,603		2		397		5,208
	Mortgage-backed securities issued by GSE			11,636		38		220		11,454
	States and political subdivisions			33		2		—		35
	Other securities			437		12		—		449
		Total HTM securities	$	18,101	$	54	$	625	$	17,530

			Amortized		Gross Unrealized				Fair
December 31, 2012			Cost		Gains		Losses		Value
			(Dollars in millions)
HTM securities:
	GSE securities			3,808		17		1		3,824
	Mortgage-backed securities issued by GSE			9,273		238		1		9,510
	States and political subdivisions			34		1		1		34
	Other securities			479		4		3		480
		Total HTM securities	$	13,594	$	260	$	6	$	13,848

Gross Realized Gains and Losses

		Years Ended December 31,
			2013		2012		2011
		(Dollars in millions)
Gross gains		$	57	$	1	$	175
Gross losses			(6)		(4)		(1)
	Net realized gains (losses)	$	51	$	(3)	$	174

Schedule of the Changes in Credit Losses on Other-Than-Temporarily Impaired Non-Agency RMBSs where a Portion of Unrealized Loss was Recognized in OCI

			Years Ended December 31,
			2013		2012		2011
			(Dollars in millions)
Balance at beginning of period			$	98	$	130	$	31
	Credit losses on securities not previously considered
		other-than-temporarily impaired		―		―		1
	Credit losses on securities for which OTTI was previously recognized			―		5		111
	Reductions for securities sold/settled during the period			(20)		(37)		(13)
Balance at end of period			$	78	$	98	$	130

Amortized Cost and Estimated Fair Value of Debt Securities by Contractual Maturity

		AFS				HTM
		Amortized		Fair		Amortized		Fair
December 31, 2013		Cost		Value		Cost		Value
		(Dollars in millions)
Due in one year or less		$	189	$	189	$	―	$	―
Due after one year through five years			565		573		―		―
Due after five years through ten years			499		519		5,926		5,524
Due after ten years			20,915		20,823		12,175		12,006
	Total debt securities	$	22,168	$	22,104	$	18,101	$	17,530

Gross Unrealized Losses and Fair Values of Investments by Investment Category and Length of Time in Unrealized Loss Position

			Less than 12 months				12 months or more				Total
			Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
December 31, 2013			Value		Losses		Value		Losses		Value		Losses
			(Dollars in millions)
AFS securities:
	MBS issued by GSE		$	10,259	$	406	$	1,935	$	140	$	12,194	$	546
	States and political subdivisions			232		8		441		83		673		91
	Other			34		1		—		—		34		1
		Total	$	10,525	$	415	$	2,376	$	223	$	12,901	$	638

HTM securities:
	U.S. Treasury		$	384	$	8	$	—	$	—	$	384	$	8
	GSE			4,996		397		—		—		4,996		397
	MBS issued by GSE			8,800		219		48		1		8,848		220
		Total	$	14,180	$	624	$	48	$	1	$	14,228	$	625

			Less than 12 months				12 months or more				Total
			Fair		Unrealized		Fair		Unrealized		Fair		Unrealized
December 31, 2012			Value		Losses		Value		Losses		Value		Losses
			(Dollars in millions)
AFS securities:
	MBS issued by GSE		$	2,662	$	18	$	—	$	—	$	2,662	$	18
	States and political subdivisions			52		1		478		89		530		90
	Non-agency MBS			—		—		113		11		113		11
		Total	$	2,714	$	19	$	591	$	100	$	3,305	$	119

HTM securities:
	GSE		$	805	$	1	$	—	$	—	$	805	$	1
	MBS issued by GSE			593		1		—		—		593		1
	States and political subdivisions			22		1		—		—		22		1
	Other			266		3		—		—		266		3
		Total	$	1,686	$	6	$	—	$	—	$	1,686	$	6